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Nächste Überarbeitung		Vorhergehende Überarbeitung
security:malware:yara [2021/06/19 13:50] – wikiadmsecurity:malware:yara [2021/07/03 15:52] (aktuell) – wikiadm
Zeile 16: Zeile 16:
        $s        $s
 } }
 +</code>
 +
 +<code>
 +sudo yara /home/student/Desktop/rules/offset.yar . -s
 </code> </code>
  
Zeile 31: Zeile 35:
  
 ====== Rule to detect maleware in PE Files ====== ====== Rule to detect maleware in PE Files ======
-malware.yar+===== Generate Rule from Strings ===== 
 +generate_rule.sh
 <code> <code>
-rule str_rule +#!/bin/bash
-{ +
-    strings:+
  
-        $s1 = "WWWWWPj" +echo "rule mw_rule" > /home/student/Desktop/rules/malware.yar 
-        $s2 = "OpenSCManagerA" +echo "{" >> /home/student/Desktop/rules/malware.yar
-        $s3 = ";22dV::tN" +
-        $s4 = "_local_unwind2" +
-        $s5 = "2+( VPOL" +
-        $s6 = "GlobalAlloc" +
-        $s7 = "VirtualProtect" +
-        $s8 = "@Pbmx~P" +
-        $s9 = "FreeLibrary" +
-        $s10 = "^Fr`+:&" +
-        $s11 = "VirtualAlloc" +
-        $s12 = "CreateDirectoryW" +
-        $s13 = ">k_I[$" +
-        $s14 = "msg/m_english.wnryF" +
-        $s15 = "StartServiceA" +
-        $s16 = ":*>B=Ox" +
-        $s17 = "OpenMutexA" +
-        $s18 = "GetFullPathNameA" +
-        $s19 = "RegSetValueExA" +
-        $s20 = "msg/m_french.wnry" +
-        $s21 = "DeleteFileW" +
-        $s22 = "QeTbF~ZiKw" +
-        $s23 = "SbElHtQeF" +
-        $s24 = "Q~TbFwZiK" +
-        $s25 = "CreateFileW" +
-        $s26 = ".?AVtype_info@@" +
-        $s27 = "CryptDecrypt" +
-        $s28 = "=j&&LZ66lA??~" +
-        $s29 = "F~TbKwZi" +
-        $s30 = "incorrect data check" +
-        $s31 = "tasksche.exe" +
-        $s32 = "MoveFileW" +
-        $s33 = "unknown compression method" +
-        $s34 = "??1exception@@UAE@XZ" +
-        $s35 = "realloc" +
-        $s36 = "SetCurrentDirectoryA" +
-        $s37 = "WriteFile" +
-        $s38 = "b4(X2;ey" +
-        $s39 = "__p__commode" +
-        $s40 = "MultiByteToWideChar" +
-        $s41 = "LoadLibraryA" +
-        $s42 = "6tGuzF" +
-        $s43 = "%%Jo..r" +
-        $s44 = "4$8,9-6'.6$:#?*1hHpXeA~SrZlN" +
-        $s45 = "PPxD<<%" +
-        $s46 = "kernel32.dll" +
-        $s47 = "&%^W6)." +
-        $s48 = "CryptImportKey" +
-        $s49 = "HeapFree" +
-        $s50 = "_except_handler3" +
-        $s51 = "WaitForSingleObject" +
-        $s52 = "V,YYG;~" +
-        $s53 = "Ud|JZ|BE" +
-        $s54 = "_CxxThrowException" +
-        $s55 = "data error" +
-        $s56 = "??0exception@@QAE@ABQBD@Z" +
-        $s57 = "_acmdln" +
-        $s58 = "OLEAUT32.dll" +
-        $s59 = ";u>H4q7.c" +
-        $s60 = "GetModuleHandleA" +
-        $s61 = "incomplete literal/length tree" +
-        $s62 = "OpenServiceA" +
-        $s63 = "CryptReleaseContext" +
-        $s64 = "attrib +h ." +
-        $s65 = "inflate 1.1.3 Copyright 1995-1998 Mark Adler" +
-        $s66 = "12t9YDPgwueZ9NyMgw519p7AA8isjr6SMw" +
-        $s67 = "insufficient memory" +
-        $s68 = "$`GnP+%<g" +
-        $s69 = "TaskStart" +
-        $s70 = "msg/m_chinese (traditional).wnry" +
-        $s71 = "[_:L x86" +
-        $s72 = "ReadFile" +
-        $s73 = "Bb..fO3" +
-        $s74 = "qDj$bIU" +
-        $s75 = "k|_^][Y" +
-        $s76 = "invalid distance code" +
-        $s77 = "wcsrchr" +
-        $s78 = "GetFileSizeEx" +
-        $s79 = "L)b7=a`" +
-        $s80 = "__CxxFrameHandler" +
-        $s81 = "_stricmp" +
-        $s82 = "[4+G[Tnr" +
-        $s83 = "13AM4VW2dhxYgXeQepoHkHSQuy6NgaEb94" +
-        $s84 = "msg/m_croatian.wnry" +
-        $s85 = "CMnQ,OOr" +
-        $s86 = "swprintf" +
-        $s87 = "SetFileAttributesW" +
-        $s88 = "msg/m_czech.wnryn" +
-        $s89 = "O|x8+^_" +
-        $s90 = "HeapAlloc" +
-        $s91 = "__setusermatherr" +
-        $s92 = "GetWindowsDirectoryW" +
-        $s93 = "115p7UMMngoj1pMvkpHijcRdfJNXj6LrLn" +
-        $s94 = "LocalFileTimeToFileTime" +
-        $s95 = "3/Vq9 =" +
-        $s96 = "CryptAcquireContextA" +
-        $s97 = "Jo7eQX%" +
-        $s98 = "FindResourceA" +
-        $s99 = "'B;1?5s" +
-        $s100 = "IsBadReadPtr" +
-        $s101 = "GetExitCodeProcess" +
-        $s102 = "`.rdata" +
-        $s103 = "#`?@/9P" +
-        $s104 = "GetTempPathW" +
-        $s105 = "invalid bit length repeat" +
-        $s106 = "MSVCRT.dll" +
-        $s107 = "o%%Jr..$" +
-        $s108 = "GlobalMsWinZonesCacheCounterMutexA" +
-        $s109 = "!`7RNkv" +
-        $s110 = "__p___argc" +
-        $s111 = "SetCurrentDirectoryW" +
-        $s112 = "oversubscribed literal/length tree" +
-        $s113 = "[l~y2U=" +
-        $s114 = "msg/m_greek.wnry4n" +
-        $s115 = "invalid block type" +
-        $s116 = "<` Xu9g" +
-        $s117 = "GetNativeSystemInfo" +
-        $s118 = "CloseServiceHandle" +
-        $s119 = "incomplete distance tree" +
-        $s120 = "S Q+c@x" +
-        $s121 = "8d62ro/" +
-        $s122 = "e ];F[p" +
-        $s123 = "$@^ Y+kCM3" +
-        $s124 = "X(N.K&9" +
-        $s125 = "LeaveCriticalSection" +
-        $s126 = "msg/m_bulgarian.wnry" +
-        $s127 = "B~WJLuC" +
-        $s128 = "invalid window size" +
-        $s129 = "msg/m_dutch.wnry9" +
-        $s130 = "GetCurrentDirectoryA" +
-        $s131 = "Hy}V2l0e" +
-        $s132 = "xxJo%%r..8$" +
-        $s133 = "NLc>zQy" +
-        $s134 = "=iF-s4\"t" +
-        $s135 = "GetFileAttributesA" +
-        $s136 = "_initterm" +
-        $s137 = "2{0ONU T8" +
-        $s138 = "M{_rKG C" +
-        $s139 = "4XI\"whG" +
-        $s140 = "DeleteCriticalSection" +
-        $s141 = "b.wnryP8" +
-        $s142 = "GetFileSize" +
-        $s143 = "GetFileAttributesW" +
-        $s144 = "md)(:--" +
-        $s145 = "WNcry@2ol7" +
-        $s146 = "empty distance tree with lengths" +
-        $s147 = "SizeofResource" +
-        $s148 = "CopyFileA" +
-        $s149 = "uo\"usd/" +
-        $s150 = "ciC [/K" +
-        $s151 = "$0vJ<T9" +
-        $s152 = "icacls . /grant Everyone:F /T /C /Q" +
-        $s153 = "CryptDestroyKey" +
-        $s154 = "oversubscribed distance tree" +
-        $s155 = "MoveFileExW" +
-        $s156 = "KfmZ@9q" +
-        $s157 = "TerminateProcess" +
-        $s158 = "stream end" +
-        $s159 = "c.wnry%" +
-        $s160 = "vi#<!d*S" +
-        $s161 = "pfgGL`R" +
-        $s162 = "_XcptFilter" +
-        $s163 = "RegCreateKeyW" +
-        $s164 = "[wS#C^6" +
-        $s165 = "file error" +
-        $s166 = ">nuGl=Cme4" +
-        $s167 = "Microsoft Enhanced RSA and AES Cryptographic Provider" +
-        $s168 = "msg/m_filipino.wnry" +
-        $s169 = "incomplete dynamic bit lengths tree" +
-        $s170 = ".?AVexception@@" +
-        $s171 = "b=htZo&f" +
-        $s172 = "KERNEL32.dll" +
-        $s173 = "msg/m_chinese (simplified).wnryR9" +
-        $s174 = "&&Lj66lZ??~A" +
-        $s175 = "#E.(`MW" +
-        $s176 = "cmd.exe /c \"%s\"" +
-        $s177 = "j_1lTo`" +
-        $s178 = "stream error" +
-        $s179 = "&Lj&6lZ6?~A?" +
-        $s180 = "WS2_32.dll" +
-        $s181 = "SystemTimeToFileTime" +
-        $s182 = "- unzip 0.15 Copyright 1998 Gilles Vollant" +
-        $s183 = "??0exception@@QAE@ABV0@@Z" +
-        $s184 = ",4$8'9-6:.6$1#?*XhHpSeA~NrZlE" +
-        $s185 = "CloseHandle" +
-        $s186 = "??2@YAPAXI@Z" +
-        $s187 = "SetFileTime" +
-        $s188 = "|~}%.15" +
-        $s189 = "GetProcessHeap" +
-        $s190 = "SE{^QC4" +
-        $s191 = "Df\"\"T~**;" +
-        $s192 = "wsprintfA" +
-        $s193 = "GetModuleFileNameA" +
-        $s194 = "RegQueryValueExA" +
-        $s195 = "2/O-_.X8w.+" +
-        $s196 = "s<,kX5k" +
-        $s197 = "4I_,eJi" +
-        $s198 = "CreateServiceA" +
-        $s199 = "f\"\"D~**T" +
-        $s200 = "_controlfp" +
-        $s201 = "incompatible version" +
-        $s202 = "dV22tN::" +
-        $s203 = "_-TPsPUv: V" +
-        $s204 = "IyEf [%" +
-        $s205 = "__set_app_type" +
-        $s206 = "InitializeCriticalSection" +
-        $s207 = "Hjz%3(0" +
-        $s208 = ".Vy_Fdk" +
-        $s209 = "'Oh'-o]" +
-        $s210 = "qr=_os*" +
-        $s211 = ",MF3j;2@" +
-        $s212 = "need dictionary" +
-        $s213 = "CreateDirectoryA" +
-        $s214 = "pq\"b\"V1" +
-        $s215 = "=XnFQ-Il" +
-        $s216 = "x%Jo%.r." +
-        $s217 = "GetProcAddress" +
-        $s218 = "CryptEncrypt" +
-        $s219 = "MSVCP60.dll" +
-        $s220 = "6P>YK^$r" +
-        $s221 = "__p___argv" +
-        $s222 = "sprintf" +
-        $s223 = "MF2E0UG" +
-        $s224 = "KPeJr}F" +
-        $s225 = "CryptGenKey" +
-        $s226 = "__getmainargs" +
-        $s227 = "`1^9tdb" +
-        $s228 = "mK~}k=P" +
-        $s229 = "ADVAPI32.dll" +
-        $s230 = "GetComputerNameW" +
-        $s231 = "!This program cannot be run in DOS mode." +
-        $s232 = "WANACRY!" +
-        $s233 = "incorrect header check" +
-        $s234 = "_mbsstr" +
-        $s235 = "Le\"zE^f1" +
-        $s236 = "msg/m_german.wnry" +
-        $s237 = "\"Df\"*T~*" +
-        $s238 = "SHELL32.dll" +
-        $s239 = "8,4$6'9-$:.6*1#?pXhH~SeAlNrZbE" +
-        $s240 = "LockResource" +
-        $s241 = "#cMe&(;[Ip" +
-        $s242 = "advapi32.dll" +
-        $s243 = "Lj&&lZ66~A??" +
-        $s244 = "L3koq_ >" +
-        $s245 = "??1type_info@@UAE@XZ" +
-        $s246 = "msg/m_danish.wnry" +
-        $s247 = "^Md]\"lN" +
-        $s248 = "EGBkV6\"rnL9" +
-        $s249 = "?-3t/''" +
-        $s250 = "GetStartupInfoA" +
-        $s251 = "tJ9@0O(" +
-        $s252 = "!A$U>=+" +
-        $s253 = "2dV2:tN:" +
-        $s254 = "tlHt Ht" +
-        $s255 = "9d|!]`[" +
-        $s256 = "GlobalFree" +
-        $s257 = "V22dN::t" +
-        $s258 = "nyMZ?%g;" +
-        $s259 = "QeFbF~TiKwZ" +
-        $s260 = "[d+?8d[" +
-        $s261 = "EnterCriticalSection" +
-        $s262 = "LoadResource" +
-        $s263 = "msg/m_finnish.wnry~" +
-        $s264 = "\"\"Df**T~" +
-        $s265 = "kEs##Q^!" +
-        $s266 = "r;#r7iS|1" +
-        $s267 = "s]R\",XC(" +
-        $s268 = "CreateFileA" +
-        $s269 = "??3@YAXPAX@Z" +
-        $s270 = "VirtualFree" +
-        $s271 = "CreateProcessA" +
-        $s272 = "invalid literal/length code" +
-        $s273 = "oversubscribed dynamic bit lengths tree" +
-        $s274 = "E65etRIv4" +
-        $s275 = "SetLastError" +
-        $s276 = "*4q4[`V" +
-        $s277 = "+[_JQ}" +
-        $s278 = "\"t=.|Vbq-" +
-        $s279 = "invalid stored block lengths" +
-        $s280 = ":95e`Il" +
-        $s281 = "$8,4-6'96$:.?*1#HpXhA~SeZlNrSbE" +
-        $s282 = "=1azT)8^y" +
-        $s283 = "__p__fmode" +
-        $s284 = "buffer error" +
-        $s285 = "^Ml,L;0" +
-        $s286 = "!#pHA[P" +
-        $s287 = "*@~CS%1" +
-        $s288 = "~|c<caKm2" +
-        $s289 = "C77nYmm" +
-        $s290 = "_adjust_fdiv" +
-        $s291 = "7#z y,:" +
-        $s292 = "e\".E~^G" +
-        $s293 = "pp|B>>q" +
-        $s294 = "SetFilePointer" +
-        $s295 = "RegCloseKey" +
-        $s296 = "strrchr" +
-        $s297 = "USER32.dll" +
-        $s298 = "too many length or distance symbols" +
-        $mz = "MZ"+
  
-    condition: any of them +echo "  strings:" >> /home/student/Desktop/rules/malware.yar 
-}+count=1 
 +while read s; do 
 +  p=${s//\"/\\\"} 
 +  echo "    \$s$count = \"$p\" fullword ascii" >> /home/student/Desktop/rules/malware.yar 
 +  count=$((count+1)) 
 +done </home/student/Desktop/intel/strings.txt
  
-rule IsPeFile { +echo "" >> /home/student/Desktop/rules/malware.yar
- strings: +
- $mz = "MZ"+
  
- condition: +echo "  condition:" >> /home/student/Desktop/rules/malware.yar 
- any of them and $mz at 0 and uint32(uint32(0x3C)) == 0x4550+echo "    any of them and" >> /home/student/Desktop/rules/malware.yar 
 +echo "    uint16(0) == 0x5A4D and" >> /home/student/Desktop/rules/malware.yar 
 +echo "    uint32(uint32(0x3C)) == 0x4550" >> /home/student/Desktop/rules/malware.yar 
 + 
 +echo "}" >> /home/student/Desktop/rules/malware.yar 
 +</code> 
 +===== Final Rule ===== 
 +malware.yar 
 +--> generated, but left only relevant string 
 + 
 +rule mw_rule 
 +{ 
 +  strings: 
 +    $s176 = "cmd.exe /c \"%s\"" fullword ascii 
 + 
 +  condition: 
 +    $s176 and 
 +    uint16(0) == 0x5A4D and 
 +    uint32(uint32(0x3C)) == 0x4550
 } }
 +
 +<code>
 +yara /home/student/Desktop/rules/malware.yar /home/student/Desktop/suspicious -s
 </code> </code>
security/malware/yara.1624103418.txt.gz · Zuletzt geändert: von wikiadm
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