Actor(s): BlackTech
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rule win_selfmake_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.selfmake." 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.selfmake" 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 = { 03c2 894308 813850450000 7407 68???????? ebd6 } // n = 6, score = 400 // 03c2 | add eax, edx // 894308 | mov dword ptr [ebx + 8], eax // 813850450000 | cmp dword ptr [eax], 0x4550 // 7407 | je 9 // 68???????? | // ebd6 | jmp 0xffffffd8 $sequence_1 = { c785e0fdffff18000000 c785f0fdffff80000000 8d95e0fdffff 52 8d85a0f9ffff 50 } // n = 6, score = 400 // c785e0fdffff18000000 | mov dword ptr [ebp - 0x220], 0x18 // c785f0fdffff80000000 | mov dword ptr [ebp - 0x210], 0x80 // 8d95e0fdffff | lea edx, dword ptr [ebp - 0x220] // 52 | push edx // 8d85a0f9ffff | lea eax, dword ptr [ebp - 0x660] // 50 | push eax $sequence_2 = { 50 e8???????? 8b442424 83c40c 5b } // n = 5, score = 400 // 50 | push eax // e8???????? | // 8b442424 | mov eax, dword ptr [esp + 0x24] // 83c40c | add esp, 0xc // 5b | pop ebx $sequence_3 = { 83f840 0f848a000000 3d00010000 741e 8b4c2474 } // n = 5, score = 400 // 83f840 | cmp eax, 0x40 // 0f848a000000 | je 0x90 // 3d00010000 | cmp eax, 0x100 // 741e | je 0x20 // 8b4c2474 | mov ecx, dword ptr [esp + 0x74] $sequence_4 = { c745fc???????? 8b55fc 8955fc 8b4510 50 8b4d0c } // n = 6, score = 400 // c745fc???????? | // 8b55fc | mov edx, dword ptr [ebp - 4] // 8955fc | mov dword ptr [ebp - 4], edx // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 50 | push eax // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] $sequence_5 = { 83c408 6818020000 6a00 8d8de0fdffff 51 e8???????? 83c40c } // n = 7, score = 400 // 83c408 | add esp, 8 // 6818020000 | push 0x218 // 6a00 | push 0 // 8d8de0fdffff | lea ecx, dword ptr [ebp - 0x220] // 51 | push ecx // e8???????? | // 83c40c | add esp, 0xc $sequence_6 = { 8bec 83ec0c 833d????????00 740a a1???????? e9???????? } // n = 6, score = 400 // 8bec | mov ebp, esp // 83ec0c | sub esp, 0xc // 833d????????00 | // 740a | je 0xc // a1???????? | // e9???????? | $sequence_7 = { 8d4c2410 51 8b4e1c 6a40 40 } // n = 5, score = 400 // 8d4c2410 | lea ecx, dword ptr [esp + 0x10] // 51 | push ecx // 8b4e1c | mov ecx, dword ptr [esi + 0x1c] // 6a40 | push 0x40 // 40 | inc eax $sequence_8 = { 8b4dec 0fbf11 8955fc 8b45e8 } // n = 4, score = 400 // 8b4dec | mov ecx, dword ptr [ebp - 0x14] // 0fbf11 | movsx edx, word ptr [ecx] // 8955fc | mov dword ptr [ebp - 4], edx // 8b45e8 | mov eax, dword ptr [ebp - 0x18] $sequence_9 = { 8d4e04 8b5614 2bd7 52 8b542410 03d7 } // n = 6, score = 400 // 8d4e04 | lea ecx, dword ptr [esi + 4] // 8b5614 | mov edx, dword ptr [esi + 0x14] // 2bd7 | sub edx, edi // 52 | push edx // 8b542410 | mov edx, dword ptr [esp + 0x10] // 03d7 | add edx, edi condition: 7 of them and filesize < 932864 }
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