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rule win_pay2key_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.pay2key." 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.pay2key" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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???????? c645fc06 8b4d08 54 8b11 ff5204 8d8d74ffffff } // n = 7, score = 300 // e8???????? | // c645fc06 | mov byte ptr [ebp - 4], 6 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 54 | push esp // 8b11 | mov edx, dword ptr [ecx] // ff5204 | call dword ptr [edx + 4] // 8d8d74ffffff | lea ecx, [ebp - 0x8c] $sequence_1 = { c745bc0f000000 c745b800000000 c645a800 e8???????? c645fc03 8d4dc0 6a02 } // n = 7, score = 300 // c745bc0f000000 | mov dword ptr [ebp - 0x44], 0xf // c745b800000000 | mov dword ptr [ebp - 0x48], 0 // c645a800 | mov byte ptr [ebp - 0x58], 0 // e8???????? | // c645fc03 | mov byte ptr [ebp - 4], 3 // 8d4dc0 | lea ecx, [ebp - 0x40] // 6a02 | push 2 $sequence_2 = { ff7538 e8???????? 8b4df4 64890d00000000 59 5f 5e } // n = 7, score = 300 // ff7538 | push dword ptr [ebp + 0x38] // e8???????? | // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 64890d00000000 | mov dword ptr fs:[0], ecx // 59 | pop ecx // 5f | pop edi // 5e | pop esi $sequence_3 = { c745fc00000000 8b0e 50 e8???????? c645fc02 8b08 85c9 } // n = 7, score = 300 // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 8b0e | mov ecx, dword ptr [esi] // 50 | push eax // e8???????? | // c645fc02 | mov byte ptr [ebp - 4], 2 // 8b08 | mov ecx, dword ptr [eax] // 85c9 | test ecx, ecx $sequence_4 = { c7869400000000000000 5e 5d c20800 8b7008 57 8b7908 } // n = 7, score = 300 // c7869400000000000000 | mov dword ptr [esi + 0x94], 0 // 5e | pop esi // 5d | pop ebp // c20800 | ret 8 // 8b7008 | mov esi, dword ptr [eax + 8] // 57 | push edi // 8b7908 | mov edi, dword ptr [ecx + 8] $sequence_5 = { e8???????? 83c408 8bf0 8d4520 3bc6 7432 8b4534 } // n = 7, score = 300 // e8???????? | // 83c408 | add esp, 8 // 8bf0 | mov esi, eax // 8d4520 | lea eax, [ebp + 0x20] // 3bc6 | cmp eax, esi // 7432 | je 0x34 // 8b4534 | mov eax, dword ptr [ebp + 0x34] $sequence_6 = { ff750c ff7508 e8???????? 8bf0 8d4608 85c0 } // n = 6, score = 300 // ff750c | push dword ptr [ebp + 0xc] // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 8bf0 | mov esi, eax // 8d4608 | lea eax, [esi + 8] // 85c0 | test eax, eax $sequence_7 = { ffd7 85c0 7517 68a0000000 68???????? 68???????? e8???????? } // n = 7, score = 300 // ffd7 | call edi // 85c0 | test eax, eax // 7517 | jne 0x19 // 68a0000000 | push 0xa0 // 68???????? | // 68???????? | // e8???????? | $sequence_8 = { ff7604 ff15???????? 6a0c 56 e8???????? 83c408 c787d400000000000000 } // n = 7, score = 300 // ff7604 | push dword ptr [esi + 4] // ff15???????? | // 6a0c | push 0xc // 56 | push esi // e8???????? | // 83c408 | add esp, 8 // c787d400000000000000 | mov dword ptr [edi + 0xd4], 0 $sequence_9 = { 8d9798000000 83c40c 66c7041eabba 83c302 837a1410 7204 8b02 } // n = 7, score = 300 // 8d9798000000 | lea edx, [edi + 0x98] // 83c40c | add esp, 0xc // 66c7041eabba | mov word ptr [esi + ebx], 0xbaab // 83c302 | add ebx, 2 // 837a1410 | cmp dword ptr [edx + 0x14], 0x10 // 7204 | jb 6 // 8b02 | mov eax, dword ptr [edx] condition: 7 of them and filesize < 2252800 }
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