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rule win_shylock_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.6.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.shylock" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" /* DISCLAIMER * The strings used in this rule have been automatically selected from the * disassembly of memory dumps and unpacked files, using YARA-Signator. * The code and documentation is published here: * https://github.com/fxb-cocacoding/yara-signator * As Malpedia is used as data source, please note that for a given * number of families, only single samples are documented. * This likely impacts the degree of generalization these rules will offer. * Take the described generation method also into consideration when you * apply the rules in your use cases and assign them confidence levels. */ strings: $sequence_0 = { 8d75fc e8???????? 8bc7 e9???????? 8d85f0feffff 50 e8???????? } // n = 7, score = 400 // 8d75fc | lea esi, [ebp - 4] // e8???????? | // 8bc7 | mov eax, edi // e9???????? | // 8d85f0feffff | lea eax, [ebp - 0x110] // 50 | push eax // e8???????? | $sequence_1 = { 8db540ffffff e8???????? 8db57cffffff e9???????? 8db57cffffff e8???????? 8d45a4 } // n = 7, score = 400 // 8db540ffffff | lea esi, [ebp - 0xc0] // e8???????? | // 8db57cffffff | lea esi, [ebp - 0x84] // e9???????? | // 8db57cffffff | lea esi, [ebp - 0x84] // e8???????? | // 8d45a4 | lea eax, [ebp - 0x5c] $sequence_2 = { e8???????? 8d8554ffffff e8???????? 3c01 7411 8b75dc 83c618 } // n = 7, score = 400 // e8???????? | // 8d8554ffffff | lea eax, [ebp - 0xac] // e8???????? | // 3c01 | cmp al, 1 // 7411 | je 0x13 // 8b75dc | mov esi, dword ptr [ebp - 0x24] // 83c618 | add esi, 0x18 $sequence_3 = { e8???????? ff742420 8d742440 e8???????? ff74242c 8bfe e8???????? } // n = 7, score = 400 // e8???????? | // ff742420 | push dword ptr [esp + 0x20] // 8d742440 | lea esi, [esp + 0x40] // e8???????? | // ff74242c | push dword ptr [esp + 0x2c] // 8bfe | mov edi, esi // e8???????? | $sequence_4 = { e8???????? 8b45fc 83c018 e8???????? 0fb6c0 85c0 7514 } // n = 7, score = 400 // e8???????? | // 8b45fc | mov eax, dword ptr [ebp - 4] // 83c018 | add eax, 0x18 // e8???????? | // 0fb6c0 | movzx eax, al // 85c0 | test eax, eax // 7514 | jne 0x16 $sequence_5 = { 50 b8???????? e8???????? 59 8bd8 8d75fc } // n = 6, score = 400 // 50 | push eax // b8???????? | // e8???????? | // 59 | pop ecx // 8bd8 | mov ebx, eax // 8d75fc | lea esi, [ebp - 4] $sequence_6 = { e8???????? 50 a1???????? ffb0bc000000 e8???????? 83c410 3d02010000 } // n = 7, score = 400 // e8???????? | // 50 | push eax // a1???????? | // ffb0bc000000 | push dword ptr [eax + 0xbc] // e8???????? | // 83c410 | add esp, 0x10 // 3d02010000 | cmp eax, 0x102 $sequence_7 = { ff750c 750f e8???????? 50 e8???????? 59 59 } // n = 7, score = 400 // ff750c | push dword ptr [ebp + 0xc] // 750f | jne 0x11 // e8???????? | // 50 | push eax // e8???????? | // 59 | pop ecx // 59 | pop ecx $sequence_8 = { 8d7dd0 ab ab 33c0 8d7de8 ab ab } // n = 7, score = 400 // 8d7dd0 | lea edi, [ebp - 0x30] // ab | stosd dword ptr es:[edi], eax // ab | stosd dword ptr es:[edi], eax // 33c0 | xor eax, eax // 8d7de8 | lea edi, [ebp - 0x18] // ab | stosd dword ptr es:[edi], eax // ab | stosd dword ptr es:[edi], eax $sequence_9 = { 68???????? ff75f4 8bc6 6801000080 e8???????? 8bde 8b7508 } // n = 7, score = 400 // 68???????? | // ff75f4 | push dword ptr [ebp - 0xc] // 8bc6 | mov eax, esi // 6801000080 | push 0x80000001 // e8???????? | // 8bde | mov ebx, esi // 8b7508 | mov esi, dword ptr [ebp + 8] condition: 7 of them and filesize < 622592 }
rule win_shylock_w0 { meta: author = "Jean-Philippe Teissier / @Jipe_" description = "Shylock Banker" date = "2013-12-12" version = "1.0" ref1 = "http://iocbucket.com/iocs/1b4660d57928df5ca843c21df0b2adb117026cba" ref2 = "http://www.trusteer.com/blog/merchant-fraud-returns-%E2%80%93-shylock-polymorphic-financial-malware-infections-rise" ref3 = "https://www.csis.dk/en/csis/blog/3811/" source = "https://github.com/mattulm/sfiles_yara/blob/master/malware/Shylock.yar" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.shylock" malpedia_version = "20170517" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $process1 = "MASTER" $process2 = "_SHUTDOWN" $process3 = "EVT_VNC" $process4 = "EVT_BACK" $process5 = "EVT_VNC" $process6 = "IE_Hook::GetRequestInfo" $process7 = "FF_Hook::getRequestInfo" $process8 = "EX_Hook::CreateProcess" $process9 = "hijackdll.dll" $process10 = "MTX_" $process11 = "FF::PR_WriteHook entry" $process12 = "FF::PR_WriteHook exit" $process13 = "HijackProcessAttach::*** MASTER *** MASTER *** MASTER *** %s PID=%u" $process14 = "HijackProcessAttach::entry" $process15 = "FF::BEFORE INJECT" $process16 = "FF::AFTER INJECT" $process17 = "IE::AFTER INJECT" $process18 = "IE::BEFORE INJECT" $process19 = "*** VNC *** VNC *** VNC *** VNC *** VNC *** VNC *** VNC *** VNC *** VNC *** VNC *** %s" $process20 = "*** LOG INJECTS *** %s" $process21 = "*** inject to process %s not allowed" $process22 = "*** BackSocks *** BackSocks *** BackSocks *** BackSocks *** BackSocks *** BackSocks *** BackSocks *** %s" $process23 = "Inject::InjectDllFromMemory" $process24 = "BadSocks.dll" $process25 = ".?AVFF_Hook@@" $process26 = ".?AVIE_Hook@@" $process27 = ".?AVPE_Hook@@" $process28 = ".?AVCInetMethods@@" $domain1 = "extensadv.cc" $domain2 = "topbeat.cc" $domain3 = "brainsphere.cc" $domain4 = "commonworldme.cc" $domain5 = "gigacat.cc" $domain6 = "nw-serv.cc" $domain7 = "paragua-analyst.cc" condition: 3 of ($process*) or any of ($domain*) }
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