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rule win_faketc_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.faketc." 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.faketc" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { d1f8 50 52 8bc7 e8???????? 892d???????? 8bc7 } // n = 7, score = 100 // d1f8 | sar eax, 1 // 50 | push eax // 52 | push edx // 8bc7 | mov eax, edi // e8???????? | // 892d???????? | // 8bc7 | mov eax, edi $sequence_1 = { 99 2bc2 57 8bf8 8b44241c 99 2bc2 } // n = 7, score = 100 // 99 | cdq // 2bc2 | sub eax, edx // 57 | push edi // 8bf8 | mov edi, eax // 8b44241c | mov eax, dword ptr [esp + 0x1c] // 99 | cdq // 2bc2 | sub eax, edx $sequence_2 = { c68424700700000e 83bc24ec00000010 7210 8b8424d8000000 50 e8???????? 83c404 } // n = 7, score = 100 // c68424700700000e | mov byte ptr [esp + 0x770], 0xe // 83bc24ec00000010 | cmp dword ptr [esp + 0xec], 0x10 // 7210 | jb 0x12 // 8b8424d8000000 | mov eax, dword ptr [esp + 0xd8] // 50 | push eax // e8???????? | // 83c404 | add esp, 4 $sequence_3 = { 8b4df8 833900 7504 33c0 eb27 8b55f8 8b02 } // n = 7, score = 100 // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 833900 | cmp dword ptr [ecx], 0 // 7504 | jne 6 // 33c0 | xor eax, eax // eb27 | jmp 0x29 // 8b55f8 | mov edx, dword ptr [ebp - 8] // 8b02 | mov eax, dword ptr [edx] $sequence_4 = { e9???????? 8d8db8060000 e9???????? 8b542408 8d420c 8b8ad4c4ffff 33c8 } // n = 7, score = 100 // e9???????? | // 8d8db8060000 | lea ecx, [ebp + 0x6b8] // e9???????? | // 8b542408 | mov edx, dword ptr [esp + 8] // 8d420c | lea eax, [edx + 0xc] // 8b8ad4c4ffff | mov ecx, dword ptr [edx - 0x3b2c] // 33c8 | xor ecx, eax $sequence_5 = { 8d4708 51 e8???????? 83c408 85c0 0f8546f9ffff 8b6c2414 } // n = 7, score = 100 // 8d4708 | lea eax, [edi + 8] // 51 | push ecx // e8???????? | // 83c408 | add esp, 8 // 85c0 | test eax, eax // 0f8546f9ffff | jne 0xfffff94c // 8b6c2414 | mov ebp, dword ptr [esp + 0x14] $sequence_6 = { c745b800000000 33db 81fb00010000 895dc4 0f8dd6010000 8b8740440000 33d2 } // n = 7, score = 100 // c745b800000000 | mov dword ptr [ebp - 0x48], 0 // 33db | xor ebx, ebx // 81fb00010000 | cmp ebx, 0x100 // 895dc4 | mov dword ptr [ebp - 0x3c], ebx // 0f8dd6010000 | jge 0x1dc // 8b8740440000 | mov eax, dword ptr [edi + 0x4440] // 33d2 | xor edx, edx $sequence_7 = { c745ac56e16300 8b4dac 51 68???????? 8b55fc 52 e8???????? } // n = 7, score = 100 // c745ac56e16300 | mov dword ptr [ebp - 0x54], 0x63e156 // 8b4dac | mov ecx, dword ptr [ebp - 0x54] // 51 | push ecx // 68???????? | // 8b55fc | mov edx, dword ptr [ebp - 4] // 52 | push edx // e8???????? | $sequence_8 = { 8db41e9979825a 8bde c1cb1b 03dd 035858 c1ca02 d1c1 } // n = 7, score = 100 // 8db41e9979825a | lea esi, [esi + ebx + 0x5a827999] // 8bde | mov ebx, esi // c1cb1b | ror ebx, 0x1b // 03dd | add ebx, ebp // 035858 | add ebx, dword ptr [eax + 0x58] // c1ca02 | ror edx, 2 // d1c1 | rol ecx, 1 $sequence_9 = { c3 5e 5f 33c0 5b c3 5d } // n = 7, score = 100 // c3 | ret // 5e | pop esi // 5f | pop edi // 33c0 | xor eax, eax // 5b | pop ebx // c3 | ret // 5d | pop ebp condition: 7 of them and filesize < 6864896 }
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