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rule win_shylock_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.shylock." info = "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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { e8???????? 8d8534ffffff 50 b8???????? e8???????? 59 50 } // n = 7, score = 500 // e8???????? | // 8d8534ffffff | lea eax, [ebp - 0xcc] // 50 | push eax // b8???????? | // e8???????? | // 59 | pop ecx // 50 | push eax $sequence_1 = { 8db544ffffff e8???????? 8bc6 50 8d45f8 e8???????? ff30 } // n = 7, score = 500 // 8db544ffffff | lea esi, [ebp - 0xbc] // e8???????? | // 8bc6 | mov eax, esi // 50 | push eax // 8d45f8 | lea eax, [ebp - 8] // e8???????? | // ff30 | push dword ptr [eax] $sequence_2 = { c22c00 0fb64001 50 8d45c8 50 8b45d4 8b30 } // n = 7, score = 500 // c22c00 | ret 0x2c // 0fb64001 | movzx eax, byte ptr [eax + 1] // 50 | push eax // 8d45c8 | lea eax, [ebp - 0x38] // 50 | push eax // 8b45d4 | mov eax, dword ptr [ebp - 0x2c] // 8b30 | mov esi, dword ptr [eax] $sequence_3 = { c745fc04010000 ff75e4 e8???????? 83c410 ff45f8 3d03010000 0f8559ffffff } // n = 7, score = 500 // c745fc04010000 | mov dword ptr [ebp - 4], 0x104 // ff75e4 | push dword ptr [ebp - 0x1c] // e8???????? | // 83c410 | add esp, 0x10 // ff45f8 | inc dword ptr [ebp - 8] // 3d03010000 | cmp eax, 0x103 // 0f8559ffffff | jne 0xffffff5f $sequence_4 = { e8???????? 3c01 743b 8d8588feffff 50 b8???????? e8???????? } // n = 7, score = 500 // e8???????? | // 3c01 | cmp al, 1 // 743b | je 0x3d // 8d8588feffff | lea eax, [ebp - 0x178] // 50 | push eax // b8???????? | // e8???????? | $sequence_5 = { 57 8b7d08 8b4d0c 8a4510 fc f2ae 7504 } // n = 7, score = 500 // 57 | push edi // 8b7d08 | mov edi, dword ptr [ebp + 8] // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 8a4510 | mov al, byte ptr [ebp + 0x10] // fc | cld // f2ae | repne scasb al, byte ptr es:[edi] // 7504 | jne 6 $sequence_6 = { 8945b0 8d856cffffff 50 8b45fc ff7018 ff9540ffffff 898534ffffff } // n = 7, score = 500 // 8945b0 | mov dword ptr [ebp - 0x50], eax // 8d856cffffff | lea eax, [ebp - 0x94] // 50 | push eax // 8b45fc | mov eax, dword ptr [ebp - 4] // ff7018 | push dword ptr [eax + 0x18] // ff9540ffffff | call dword ptr [ebp - 0xc0] // 898534ffffff | mov dword ptr [ebp - 0xcc], eax $sequence_7 = { 8d75f8 8bfc e8???????? 8d8504ffffff 50 ff7508 e8???????? } // n = 7, score = 500 // 8d75f8 | lea esi, [ebp - 8] // 8bfc | mov edi, esp // e8???????? | // 8d8504ffffff | lea eax, [ebp - 0xfc] // 50 | push eax // ff7508 | push dword ptr [ebp + 8] // e8???????? | $sequence_8 = { 51 33d2 8d5df8 e8???????? 8d45ec e8???????? 8bf8 } // n = 7, score = 500 // 51 | push ecx // 33d2 | xor edx, edx // 8d5df8 | lea ebx, [ebp - 8] // e8???????? | // 8d45ec | lea eax, [ebp - 0x14] // e8???????? | // 8bf8 | mov edi, eax $sequence_9 = { e8???????? e8???????? 59 59 8bf0 e8???????? 8d75fc } // n = 7, score = 500 // e8???????? | // e8???????? | // 59 | pop ecx // 59 | pop ecx // 8bf0 | mov esi, eax // e8???????? | // 8d75fc | lea esi, [ebp - 4] condition: 7 of them and filesize < 630784 }
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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