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rule win_pay2key_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "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 = { eb03 897a08 8b45fc 8b7004 391e 7523 807f0d00 } // n = 7, score = 300 // eb03 | jmp 5 // 897a08 | mov dword ptr [edx + 8], edi // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b7004 | mov esi, dword ptr [eax + 4] // 391e | cmp dword ptr [esi], ebx // 7523 | jne 0x25 // 807f0d00 | cmp byte ptr [edi + 0xd], 0 $sequence_1 = { 83c40c 8d731c 8bf8 3bf7 743a 8b4614 83f808 } // n = 7, score = 300 // 83c40c | add esp, 0xc // 8d731c | lea esi, [ebx + 0x1c] // 8bf8 | mov edi, eax // 3bf7 | cmp esi, edi // 743a | je 0x3c // 8b4614 | mov eax, dword ptr [esi + 0x14] // 83f808 | cmp eax, 8 $sequence_2 = { c6450800 83f808 720d 40 8d4d20 50 ff7520 } // n = 7, score = 300 // c6450800 | mov byte ptr [ebp + 8], 0 // 83f808 | cmp eax, 8 // 720d | jb 0xf // 40 | inc eax // 8d4d20 | lea ecx, [ebp + 0x20] // 50 | push eax // ff7520 | push dword ptr [ebp + 0x20] $sequence_3 = { 83c40c 8b461c 8d4d90 50 c745e00a000000 894de4 c745e800000000 } // n = 7, score = 300 // 83c40c | add esp, 0xc // 8b461c | mov eax, dword ptr [esi + 0x1c] // 8d4d90 | lea ecx, [ebp - 0x70] // 50 | push eax // c745e00a000000 | mov dword ptr [ebp - 0x20], 0xa // 894de4 | mov dword ptr [ebp - 0x1c], ecx // c745e800000000 | mov dword ptr [ebp - 0x18], 0 $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???????? 83ec0c c645fc01 8d5f38 8bcc 53 } // n = 6, score = 300 // e8???????? | // 83ec0c | sub esp, 0xc // c645fc01 | mov byte ptr [ebp - 4], 1 // 8d5f38 | lea ebx, [edi + 0x38] // 8bcc | mov ecx, esp // 53 | push ebx $sequence_6 = { ff752c 8bc8 c745fc01000000 ff7528 ff7524 ff7520 ff751c } // n = 7, score = 300 // ff752c | push dword ptr [ebp + 0x2c] // 8bc8 | mov ecx, eax // c745fc01000000 | mov dword ptr [ebp - 4], 1 // ff7528 | push dword ptr [ebp + 0x28] // ff7524 | push dword ptr [ebp + 0x24] // ff7520 | push dword ptr [ebp + 0x20] // ff751c | push dword ptr [ebp + 0x1c] $sequence_7 = { 8d4df4 e8???????? f30f7e00 660fd606 8b4808 894e08 8bc7 } // n = 7, score = 300 // 8d4df4 | lea ecx, [ebp - 0xc] // e8???????? | // f30f7e00 | movq xmm0, qword ptr [eax] // 660fd606 | movq qword ptr [esi], xmm0 // 8b4808 | mov ecx, dword ptr [eax + 8] // 894e08 | mov dword ptr [esi + 8], ecx // 8bc7 | mov eax, edi $sequence_8 = { 3bfb 744d 83c704 8b37 85f6 743a c745fc00000000 } // n = 7, score = 300 // 3bfb | cmp edi, ebx // 744d | je 0x4f // 83c704 | add edi, 4 // 8b37 | mov esi, dword ptr [edi] // 85f6 | test esi, esi // 743a | je 0x3c // c745fc00000000 | mov dword ptr [ebp - 4], 0 $sequence_9 = { 56 e8???????? 8bd0 b9feffff0f 8b4704 2bc8 83f901 } // n = 7, score = 300 // 56 | push esi // e8???????? | // 8bd0 | mov edx, eax // b9feffff0f | mov ecx, 0xffffffe // 8b4704 | mov eax, dword ptr [edi + 4] // 2bc8 | sub ecx, eax // 83f901 | cmp ecx, 1 condition: 7 of them and filesize < 2252800 }
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