Actor(s): BlackTech
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rule win_selfmake_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 8b34b2 eb06 33c9 ebe4 8bf1 85f6 756a } // n = 7, score = 400 // 8b34b2 | mov esi, dword ptr [edx + esi*4] // eb06 | jmp 8 // 33c9 | xor ecx, ecx // ebe4 | jmp 0xffffffe6 // 8bf1 | mov esi, ecx // 85f6 | test esi, esi // 756a | jne 0x6c $sequence_1 = { 8b4c2470 57 50 51 } // n = 4, score = 400 // 8b4c2470 | mov ecx, dword ptr [esp + 0x70] // 57 | push edi // 50 | push eax // 51 | push ecx $sequence_2 = { ebe4 8bf1 85f6 756a 85db } // n = 5, score = 400 // ebe4 | jmp 0xffffffe6 // 8bf1 | mov esi, ecx // 85f6 | test esi, esi // 756a | jne 0x6c // 85db | test ebx, ebx $sequence_3 = { 833d????????00 740a 8d45f8 50 ff15???????? 833d????????00 740e } // n = 7, score = 400 // 833d????????00 | // 740a | je 0xc // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // ff15???????? | // 833d????????00 | // 740e | je 0x10 $sequence_4 = { 7d1b 8b15???????? 52 ff15???????? c705????????00000000 33c0 } // n = 6, score = 400 // 7d1b | jge 0x1d // 8b15???????? | // 52 | push edx // ff15???????? | // c705????????00000000 | // 33c0 | xor eax, eax $sequence_5 = { 8b4b2c 6a00 6a01 51 ffd0 8b16 83c604 } // n = 7, score = 400 // 8b4b2c | mov ecx, dword ptr [ebx + 0x2c] // 6a00 | push 0 // 6a01 | push 1 // 51 | push ecx // ffd0 | call eax // 8b16 | mov edx, dword ptr [esi] // 83c604 | add esi, 4 $sequence_6 = { b801000000 5f 59 c3 8b7f1c 57 68???????? } // n = 7, score = 400 // b801000000 | mov eax, 1 // 5f | pop edi // 59 | pop ecx // c3 | ret // 8b7f1c | mov edi, dword ptr [edi + 0x1c] // 57 | push edi // 68???????? | $sequence_7 = { 8b4250 8d4c2410 51 8b4e1c 6a40 40 50 } // n = 7, score = 400 // 8b4250 | mov eax, dword ptr [edx + 0x50] // 8d4c2410 | lea ecx, [esp + 0x10] // 51 | push ecx // 8b4e1c | mov ecx, dword ptr [esi + 0x1c] // 6a40 | push 0x40 // 40 | inc eax // 50 | push eax $sequence_8 = { eb4c 833d????????00 7410 6a00 6a00 a1???????? } // n = 6, score = 400 // eb4c | jmp 0x4e // 833d????????00 | // 7410 | je 0x12 // 6a00 | push 0 // 6a00 | push 0 // a1???????? | $sequence_9 = { 8d4e04 8b5614 2bd7 52 8b542410 03d7 } // n = 6, score = 400 // 8d4e04 | lea ecx, [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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