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rule win_compfun_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.compfun" 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 = { e8???????? 83c40c c7064f70656e c7460450726f63 c7460865737354 c7460c6f6b656e c6461000 } // n = 7, score = 300 // e8???????? | // 83c40c | add esp, 0xc // c7064f70656e | mov dword ptr [esi], 0x6e65704f // c7460450726f63 | mov dword ptr [esi + 4], 0x636f7250 // c7460865737354 | mov dword ptr [esi + 8], 0x54737365 // c7460c6f6b656e | mov dword ptr [esi + 0xc], 0x6e656b6f // c6461000 | mov byte ptr [esi + 0x10], 0 $sequence_1 = { c746046c2e646c c6460900 8bc6 5e } // n = 4, score = 300 // c746046c2e646c | mov dword ptr [esi + 4], 0x6c642e6c // c6460900 | mov byte ptr [esi + 9], 0 // 8bc6 | mov eax, esi // 5e | pop esi $sequence_2 = { 50 e8???????? 83c40c 33c0 6a09 5b 8bcb } // n = 7, score = 300 // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 33c0 | xor eax, eax // 6a09 | push 9 // 5b | pop ebx // 8bcb | mov ecx, ebx $sequence_3 = { 8b450c 53 8b5d14 8985a4fdffff } // n = 4, score = 300 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 53 | push ebx // 8b5d14 | mov ebx, dword ptr [ebp + 0x14] // 8985a4fdffff | mov dword ptr [ebp - 0x25c], eax $sequence_4 = { c7064765744d c746046f64756c c746086546696c c7460c654e616d } // n = 4, score = 300 // c7064765744d | mov dword ptr [esi], 0x4d746547 // c746046f64756c | mov dword ptr [esi + 4], 0x6c75646f // c746086546696c | mov dword ptr [esi + 8], 0x6c694665 // c7460c654e616d | mov dword ptr [esi + 0xc], 0x6d614e65 $sequence_5 = { c7460c462d3436 c7461037432d38 c746144533442d c7461843343537 } // n = 4, score = 300 // c7460c462d3436 | mov dword ptr [esi + 0xc], 0x36342d46 // c7461037432d38 | mov dword ptr [esi + 0x10], 0x382d4337 // c746144533442d | mov dword ptr [esi + 0x14], 0x2d443345 // c7461843343537 | mov dword ptr [esi + 0x18], 0x37353443 $sequence_6 = { 56 e8???????? 83c40c c7066b65726e } // n = 4, score = 300 // 56 | push esi // e8???????? | // 83c40c | add esp, 0xc // c7066b65726e | mov dword ptr [esi], 0x6e72656b $sequence_7 = { e8???????? 59 50 57 ffd3 894624 85c0 } // n = 7, score = 300 // e8???????? | // 59 | pop ecx // 50 | push eax // 57 | push edi // ffd3 | call ebx // 894624 | mov dword ptr [esi + 0x24], eax // 85c0 | test eax, eax $sequence_8 = { 48894c2408 4881ec78090000 b904010000 e8???????? } // n = 4, score = 100 // 48894c2408 | dec eax // 4881ec78090000 | mov dword ptr [esp + 8], ecx // b904010000 | dec eax // e8???????? | $sequence_9 = { c644244400 488b8c2480000000 8b442440 39410c } // n = 4, score = 100 // c644244400 | dec eax // 488b8c2480000000 | mov dword ptr [esp + 0x28], eax // 8b442440 | dec eax // 39410c | lea eax, [esp + 0x50] $sequence_10 = { e8???????? c644243800 4883bc248000000000 7507 33c0 e9???????? } // n = 6, score = 100 // e8???????? | // c644243800 | dec eax // 4883bc248000000000 | mov dword ptr [esp + 0x1c0], eax // 7507 | dec eax // 33c0 | mov edi, dword ptr [esp + 0x1c0] // e9???????? | $sequence_11 = { 33c0 b90f000000 f3aa 488d442440 4889442450 } // n = 5, score = 100 // 33c0 | imul edx, edx, 0x18 // b90f000000 | dec eax // f3aa | mov ecx, dword ptr [esp + 0x28] // 488d442440 | dec eax // 4889442450 | mov ecx, dword ptr [ecx + 8] $sequence_12 = { 48898424c0010000 488bbc24c0010000 33c0 b9c0000000 f3aa } // n = 5, score = 100 // 48898424c0010000 | cmp dword ptr [esp + 0x38], 0 // 488bbc24c0010000 | jne 0xf5 // 33c0 | dec eax // b9c0000000 | mov edx, dword ptr [esp + 0x70] // f3aa | dec eax $sequence_13 = { ba01000000 488b4c2460 e8???????? 48c744246000000000 e8???????? e8???????? } // n = 6, score = 100 // ba01000000 | add edx, 0x18d // 488b4c2460 | dec eax // e8???????? | // 48c744246000000000 | lea eax, [esp + 0x3c] // e8???????? | // e8???????? | $sequence_14 = { 8b4010 83c001 8bd0 486bd218 488b4c2428 488b4908 } // n = 6, score = 100 // 8b4010 | sub esp, 0x978 // 83c001 | mov ecx, 0x104 // 8bd0 | mov eax, dword ptr [eax + 0x10] // 486bd218 | add eax, 1 // 488b4c2428 | mov edx, eax // 488b4908 | dec eax $sequence_15 = { 837c243800 0f85ea000000 488b542470 4881c28d010000 488d44243c 4889442428 488d442450 } // n = 7, score = 100 // 837c243800 | xor eax, eax // 0f85ea000000 | mov ecx, 0xf // 488b542470 | rep stosb byte ptr es:[edi], al // 4881c28d010000 | dec eax // 488d44243c | lea eax, [esp + 0x40] // 4889442428 | dec eax // 488d442450 | mov dword ptr [esp + 0x50], eax condition: 7 of them and filesize < 402432 }
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