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rule win_deadwood_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.deadwood." 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.deadwood" 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 = { 2bc1 46 c1f803 83c404 3bc6 77d1 8b35???????? } // n = 7, score = 100 // 2bc1 | sub eax, ecx // 46 | inc esi // c1f803 | sar eax, 3 // 83c404 | add esp, 4 // 3bc6 | cmp eax, esi // 77d1 | ja 0xffffffd3 // 8b35???????? | $sequence_1 = { 8b75bc 56 e8???????? 83c404 8bc7 8b4df4 64890d00000000 } // n = 7, score = 100 // 8b75bc | mov esi, dword ptr [ebp - 0x44] // 56 | push esi // e8???????? | // 83c404 | add esp, 4 // 8bc7 | mov eax, edi // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 64890d00000000 | mov dword ptr fs:[0], ecx $sequence_2 = { e8???????? 8b5514 8b4b04 83c410 52 50 51 } // n = 7, score = 100 // e8???????? | // 8b5514 | mov edx, dword ptr [ebp + 0x14] // 8b4b04 | mov ecx, dword ptr [ebx + 4] // 83c410 | add esp, 0x10 // 52 | push edx // 50 | push eax // 51 | push ecx $sequence_3 = { 83c404 c645fc31 e8???????? 83c438 8d4d90 e8???????? 8d8da4feffff } // n = 7, score = 100 // 83c404 | add esp, 4 // c645fc31 | mov byte ptr [ebp - 4], 0x31 // e8???????? | // 83c438 | add esp, 0x38 // 8d4d90 | lea ecx, [ebp - 0x70] // e8???????? | // 8d8da4feffff | lea ecx, [ebp - 0x15c] $sequence_4 = { 884dd4 c745fc01000000 84c9 0f84e4000000 8b4804 8d55e8 52 } // n = 7, score = 100 // 884dd4 | mov byte ptr [ebp - 0x2c], cl // c745fc01000000 | mov dword ptr [ebp - 4], 1 // 84c9 | test cl, cl // 0f84e4000000 | je 0xea // 8b4804 | mov ecx, dword ptr [eax + 4] // 8d55e8 | lea edx, [ebp - 0x18] // 52 | push edx $sequence_5 = { 8d55e4 52 03cb e8???????? 50 c645fc03 e8???????? } // n = 7, score = 100 // 8d55e4 | lea edx, [ebp - 0x1c] // 52 | push edx // 03cb | add ecx, ebx // e8???????? | // 50 | push eax // c645fc03 | mov byte ptr [ebp - 4], 3 // e8???????? | $sequence_6 = { 50 8d45f4 64a300000000 33db 895dfc 8bf7 897dcc } // n = 7, score = 100 // 50 | push eax // 8d45f4 | lea eax, [ebp - 0xc] // 64a300000000 | mov dword ptr fs:[0], eax // 33db | xor ebx, ebx // 895dfc | mov dword ptr [ebp - 4], ebx // 8bf7 | mov esi, edi // 897dcc | mov dword ptr [ebp - 0x34], edi $sequence_7 = { 747e 8b5514 3d00010000 8b4510 7422 8b4d1c 57 } // n = 7, score = 100 // 747e | je 0x80 // 8b5514 | mov edx, dword ptr [ebp + 0x14] // 3d00010000 | cmp eax, 0x100 // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 7422 | je 0x24 // 8b4d1c | mov ecx, dword ptr [ebp + 0x1c] // 57 | push edi $sequence_8 = { 83c60c e9???????? 8b4de8 e9???????? 8b542408 8d420c 8b4ae4 } // n = 7, score = 100 // 83c60c | add esi, 0xc // e9???????? | // 8b4de8 | mov ecx, dword ptr [ebp - 0x18] // e9???????? | // 8b542408 | mov edx, dword ptr [esp + 8] // 8d420c | lea eax, [edx + 0xc] // 8b4ae4 | mov ecx, dword ptr [edx - 0x1c] $sequence_9 = { e8???????? 50 8bcf 895dfc e8???????? 837de810 720c } // n = 7, score = 100 // e8???????? | // 50 | push eax // 8bcf | mov ecx, edi // 895dfc | mov dword ptr [ebp - 4], ebx // e8???????? | // 837de810 | cmp dword ptr [ebp - 0x18], 0x10 // 720c | jb 0xe condition: 7 of them and filesize < 1055744 }
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