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rule win_tarsip_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" version = "1" description = "Detects win.tarsip." 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.tarsip" malpedia_rule_date = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { 899c2464420100 899c2468420100 8d442410 50 899c2484420100 e8???????? } // n = 6, score = 100 // 899c2464420100 | mov dword ptr [esp + 0x14264], ebx // 899c2468420100 | mov dword ptr [esp + 0x14268], ebx // 8d442410 | lea eax, [esp + 0x10] // 50 | push eax // 899c2484420100 | mov dword ptr [esp + 0x14284], ebx // e8???????? | $sequence_1 = { bdc40f0000 897c240c 393e 0f868d010000 53 } // n = 5, score = 100 // bdc40f0000 | mov ebp, 0xfc4 // 897c240c | mov dword ptr [esp + 0xc], edi // 393e | cmp dword ptr [esi], edi // 0f868d010000 | jbe 0x193 // 53 | push ebx $sequence_2 = { 52 ba???????? 8bcf e8???????? 8d8424ac000000 50 e8???????? } // n = 7, score = 100 // 52 | push edx // ba???????? | // 8bcf | mov ecx, edi // e8???????? | // 8d8424ac000000 | lea eax, [esp + 0xac] // 50 | push eax // e8???????? | $sequence_3 = { 889c24c8020000 e8???????? 8b35???????? 83c40c 6804010000 8d8424c0020000 50 } // n = 7, score = 100 // 889c24c8020000 | mov byte ptr [esp + 0x2c8], bl // e8???????? | // 8b35???????? | // 83c40c | add esp, 0xc // 6804010000 | push 0x104 // 8d8424c0020000 | lea eax, [esp + 0x2c0] // 50 | push eax $sequence_4 = { 8d4c2414 68???????? 51 e8???????? 8b8618420100 83c41c 68000000a0 } // n = 7, score = 100 // 8d4c2414 | lea ecx, [esp + 0x14] // 68???????? | // 51 | push ecx // e8???????? | // 8b8618420100 | mov eax, dword ptr [esi + 0x14218] // 83c41c | add esp, 0x1c // 68000000a0 | push 0xa0000000 $sequence_5 = { 8b442410 50 e8???????? 83c404 b801000000 8b8c242c010000 64890d00000000 } // n = 7, score = 100 // 8b442410 | mov eax, dword ptr [esp + 0x10] // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // b801000000 | mov eax, 1 // 8b8c242c010000 | mov ecx, dword ptr [esp + 0x12c] // 64890d00000000 | mov dword ptr fs:[0], ecx $sequence_6 = { 53 55 57 33db 8d8e907e0000 bd73020000 } // n = 6, score = 100 // 53 | push ebx // 55 | push ebp // 57 | push edi // 33db | xor ebx, ebx // 8d8e907e0000 | lea ecx, [esi + 0x7e90] // bd73020000 | mov ebp, 0x273 $sequence_7 = { eb6d 8b3f ebdc 8b8424ac000000 50 55 } // n = 6, score = 100 // eb6d | jmp 0x6f // 8b3f | mov edi, dword ptr [edi] // ebdc | jmp 0xffffffde // 8b8424ac000000 | mov eax, dword ptr [esp + 0xac] // 50 | push eax // 55 | push ebp $sequence_8 = { c78424c8070000ffffffff c74424700f000000 895c246c 885c245c 39b4248c000000 720d 8b4c2478 } // n = 7, score = 100 // c78424c8070000ffffffff | mov dword ptr [esp + 0x7c8], 0xffffffff // c74424700f000000 | mov dword ptr [esp + 0x70], 0xf // 895c246c | mov dword ptr [esp + 0x6c], ebx // 885c245c | mov byte ptr [esp + 0x5c], bl // 39b4248c000000 | cmp dword ptr [esp + 0x8c], esi // 720d | jb 0xf // 8b4c2478 | mov ecx, dword ptr [esp + 0x78] $sequence_9 = { 52 e8???????? 83c414 eb10 6a0a 8d542404 52 } // n = 7, score = 100 // 52 | push edx // e8???????? | // 83c414 | add esp, 0x14 // eb10 | jmp 0x12 // 6a0a | push 0xa // 8d542404 | lea edx, [esp + 4] // 52 | push edx condition: 7 of them and filesize < 360448 }
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