Actor(s): BlackTech
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rule win_selfmake_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 83c104 3bf0 7ce3 68???????? } // n = 4, score = 400 // 83c104 | add ecx, 4 // 3bf0 | cmp esi, eax // 7ce3 | jl 0xffffffe5 // 68???????? | $sequence_1 = { 83e107 894df4 8b55f4 52 ff15???????? a1???????? 8be5 } // n = 7, score = 400 // 83e107 | and ecx, 7 // 894df4 | mov dword ptr [ebp - 0xc], ecx // 8b55f4 | mov edx, dword ptr [ebp - 0xc] // 52 | push edx // ff15???????? | // a1???????? | // 8be5 | mov esp, ebp $sequence_2 = { 8d742430 742e e8???????? 6aff } // n = 4, score = 400 // 8d742430 | lea esi, [esp + 0x30] // 742e | je 0x30 // e8???????? | // 6aff | push -1 $sequence_3 = { 47 84c0 75f8 66a1???????? 668907 8d44243c 8bd0 } // n = 7, score = 400 // 47 | inc edi // 84c0 | test al, al // 75f8 | jne 0xfffffffa // 66a1???????? | // 668907 | mov word ptr [edi], ax // 8d44243c | lea eax, [esp + 0x3c] // 8bd0 | mov edx, eax $sequence_4 = { 8945f8 837df800 7408 8b45f8 e9???????? e8???????? } // n = 6, score = 400 // 8945f8 | mov dword ptr [ebp - 8], eax // 837df800 | cmp dword ptr [ebp - 8], 0 // 7408 | je 0xa // 8b45f8 | mov eax, dword ptr [ebp - 8] // e9???????? | // e8???????? | $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 = { 7604 2bf1 eb02 33f6 8b4310 25c0010000 83f840 } // n = 7, score = 400 // 7604 | jbe 6 // 2bf1 | sub esi, ecx // eb02 | jmp 4 // 33f6 | xor esi, esi // 8b4310 | mov eax, dword ptr [ebx + 0x10] // 25c0010000 | and eax, 0x1c0 // 83f840 | cmp eax, 0x40 $sequence_7 = { 81fa???????? 7209 83c014 3bc1 72eb } // n = 5, score = 400 // 81fa???????? | // 7209 | jb 0xb // 83c014 | add eax, 0x14 // 3bc1 | cmp eax, ecx // 72eb | jb 0xffffffed $sequence_8 = { 51 e8???????? 8b742418 8bbc2418020000 } // n = 4, score = 400 // 51 | push ecx // e8???????? | // 8b742418 | mov esi, dword ptr [esp + 0x18] // 8bbc2418020000 | mov edi, dword ptr [esp + 0x218] $sequence_9 = { e8???????? 56 e8???????? 8b442424 8b35???????? 83c414 50 } // n = 7, score = 400 // e8???????? | // 56 | push esi // e8???????? | // 8b442424 | mov eax, dword ptr [esp + 0x24] // 8b35???????? | // 83c414 | add esp, 0x14 // 50 | push eax condition: 7 of them and filesize < 932864 }
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