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rule win_unidentified_074_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.unidentified_074." 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.unidentified_074" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 40 50 51 e8???????? c7461407000000 } // n = 5, score = 200 // 40 | inc eax // 50 | push eax // 51 | push ecx // e8???????? | // c7461407000000 | mov dword ptr [esi + 0x14], 7 $sequence_1 = { 8955e0 895010 7204 8b08 } // n = 4, score = 200 // 8955e0 | mov dword ptr [ebp - 0x20], edx // 895010 | mov dword ptr [eax + 0x10], edx // 7204 | jb 6 // 8b08 | mov ecx, dword ptr [eax] $sequence_2 = { 6a01 83ec08 c745d400000000 e8???????? 50 } // n = 5, score = 200 // 6a01 | push 1 // 83ec08 | sub esp, 8 // c745d400000000 | mov dword ptr [ebp - 0x2c], 0 // e8???????? | // 50 | push eax $sequence_3 = { 50 53 e8???????? 8b8d6ce7ffff } // n = 4, score = 200 // 50 | push eax // 53 | push ebx // e8???????? | // 8b8d6ce7ffff | mov ecx, dword ptr [ebp - 0x1894] $sequence_4 = { 85f6 7466 56 8d85fcfbffff } // n = 4, score = 200 // 85f6 | test esi, esi // 7466 | je 0x68 // 56 | push esi // 8d85fcfbffff | lea eax, dword ptr [ebp - 0x404] $sequence_5 = { 0fb6853cffffff 50 0fb6853bffffff 50 0fb6853affffff 50 0fb68539ffffff } // n = 7, score = 200 // 0fb6853cffffff | movzx eax, byte ptr [ebp - 0xc4] // 50 | push eax // 0fb6853bffffff | movzx eax, byte ptr [ebp - 0xc5] // 50 | push eax // 0fb6853affffff | movzx eax, byte ptr [ebp - 0xc6] // 50 | push eax // 0fb68539ffffff | movzx eax, byte ptr [ebp - 0xc7] $sequence_6 = { e8???????? 8b8d6ce7ffff 83c40c eb12 8b8558e7ffff 8903 c78558e7ffff00000000 } // n = 7, score = 200 // e8???????? | // 8b8d6ce7ffff | mov ecx, dword ptr [ebp - 0x1894] // 83c40c | add esp, 0xc // eb12 | jmp 0x14 // 8b8558e7ffff | mov eax, dword ptr [ebp - 0x18a8] // 8903 | mov dword ptr [ebx], eax // c78558e7ffff00000000 | mov dword ptr [ebp - 0x18a8], 0 $sequence_7 = { 0f1f4000 8a08 40 84c9 75f9 52 2bc7 } // n = 7, score = 200 // 0f1f4000 | nop dword ptr [eax] // 8a08 | mov cl, byte ptr [eax] // 40 | inc eax // 84c9 | test cl, cl // 75f9 | jne 0xfffffffb // 52 | push edx // 2bc7 | sub eax, edi $sequence_8 = { 83ec08 8845f0 8d45f0 50 e8???????? 884435e8 } // n = 6, score = 200 // 83ec08 | sub esp, 8 // 8845f0 | mov byte ptr [ebp - 0x10], al // 8d45f0 | lea eax, dword ptr [ebp - 0x10] // 50 | push eax // e8???????? | // 884435e8 | mov byte ptr [ebp + esi - 0x18], al $sequence_9 = { b9???????? e8???????? 8945fc ff55fc ff25???????? 55 8bec } // n = 7, score = 200 // b9???????? | // e8???????? | // 8945fc | mov dword ptr [ebp - 4], eax // ff55fc | call dword ptr [ebp - 4] // ff25???????? | // 55 | push ebp // 8bec | mov ebp, esp condition: 7 of them and filesize < 335872 }
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