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rule win_pay2key_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.pay2key" 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 = { 8d4d88 e9???????? 8d4dd8 e9???????? 8d8d2cffffff e9???????? 8b4d80 } // n = 7, score = 200 // 8d4d88 | lea ecx, [ebp - 0x78] // e9???????? | // 8d4dd8 | lea ecx, [ebp - 0x28] // e9???????? | // 8d8d2cffffff | lea ecx, [ebp - 0xd4] // e9???????? | // 8b4d80 | mov ecx, dword ptr [ebp - 0x80] $sequence_1 = { 7202 8b36 33c0 668906 8d771c 8b4614 83f808 } // n = 7, score = 200 // 7202 | jb 4 // 8b36 | mov esi, dword ptr [esi] // 33c0 | xor eax, eax // 668906 | mov word ptr [esi], ax // 8d771c | lea esi, [edi + 0x1c] // 8b4614 | mov eax, dword ptr [esi + 0x14] // 83f808 | cmp eax, 8 $sequence_2 = { 0f85e3feffff 8b559c 8bc3 2bc2 7553 8d45af c645afff } // n = 7, score = 200 // 0f85e3feffff | jne 0xfffffee9 // 8b559c | mov edx, dword ptr [ebp - 0x64] // 8bc3 | mov eax, ebx // 2bc2 | sub eax, edx // 7553 | jne 0x55 // 8d45af | lea eax, [ebp - 0x51] // c645afff | mov byte ptr [ebp - 0x51], 0xff $sequence_3 = { ff15???????? 85c0 7507 8bcf e8???????? 8b4e1c e8???????? } // n = 7, score = 200 // ff15???????? | // 85c0 | test eax, eax // 7507 | jne 9 // 8bcf | mov ecx, edi // e8???????? | // 8b4e1c | mov ecx, dword ptr [esi + 0x1c] // e8???????? | $sequence_4 = { c745dc07000000 6aff 50 56 8d4dc8 c745d800000000 668945c8 } // n = 7, score = 200 // c745dc07000000 | mov dword ptr [ebp - 0x24], 7 // 6aff | push -1 // 50 | push eax // 56 | push esi // 8d4dc8 | lea ecx, [ebp - 0x38] // c745d800000000 | mov dword ptr [ebp - 0x28], 0 // 668945c8 | mov word ptr [ebp - 0x38], ax $sequence_5 = { 8b7714 8b36 90 837f1400 7517 68d8020000 68???????? } // n = 7, score = 200 // 8b7714 | mov esi, dword ptr [edi + 0x14] // 8b36 | mov esi, dword ptr [esi] // 90 | nop // 837f1400 | cmp dword ptr [edi + 0x14], 0 // 7517 | jne 0x19 // 68d8020000 | push 0x2d8 // 68???????? | $sequence_6 = { c645fc01 c70300000000 c7430400000000 8b750c 8b4508 8975f0 8945ec } // n = 7, score = 200 // c645fc01 | mov byte ptr [ebp - 4], 1 // c70300000000 | mov dword ptr [ebx], 0 // c7430400000000 | mov dword ptr [ebx + 4], 0 // 8b750c | mov esi, dword ptr [ebp + 0xc] // 8b4508 | mov eax, dword ptr [ebp + 8] // 8975f0 | mov dword ptr [ebp - 0x10], esi // 8945ec | mov dword ptr [ebp - 0x14], eax $sequence_7 = { 837f4400 0f86b5010000 83ec18 8d45a8 8bcc 50 e8???????? } // n = 7, score = 200 // 837f4400 | cmp dword ptr [edi + 0x44], 0 // 0f86b5010000 | jbe 0x1bb // 83ec18 | sub esp, 0x18 // 8d45a8 | lea eax, [ebp - 0x58] // 8bcc | mov ecx, esp // 50 | push eax // e8???????? | $sequence_8 = { 8bbd24ffffff 8b952cffffff 299384000000 8b37 837e0800 7517 68d8020000 } // n = 7, score = 200 // 8bbd24ffffff | mov edi, dword ptr [ebp - 0xdc] // 8b952cffffff | mov edx, dword ptr [ebp - 0xd4] // 299384000000 | sub dword ptr [ebx + 0x84], edx // 8b37 | mov esi, dword ptr [edi] // 837e0800 | cmp dword ptr [esi + 8], 0 // 7517 | jne 0x19 // 68d8020000 | push 0x2d8 $sequence_9 = { 8b4d14 5f 5e f30f7e00 660fd601 8b4008 894108 } // n = 7, score = 200 // 8b4d14 | mov ecx, dword ptr [ebp + 0x14] // 5f | pop edi // 5e | pop esi // f30f7e00 | movq xmm0, qword ptr [eax] // 660fd601 | movq qword ptr [ecx], xmm0 // 8b4008 | mov eax, dword ptr [eax + 8] // 894108 | mov dword ptr [ecx + 8], eax condition: 7 of them and filesize < 2113536 }
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