Actor(s): Naikon
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rule win_winmm_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.winmm." 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.winmm" 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 = { e8???????? 83c40c 85c0 752d 83c606 c744241400000400 eb4f } // n = 7, score = 200 // e8???????? | // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 752d | jne 0x2f // 83c606 | add esi, 6 // c744241400000400 | mov dword ptr [esp + 0x14], 0x40000 // eb4f | jmp 0x51 $sequence_1 = { 8b4df0 83c104 e9???????? 8b4df0 81c1980c0000 } // n = 5, score = 200 // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 83c104 | add ecx, 4 // e9???????? | // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 81c1980c0000 | add ecx, 0xc98 $sequence_2 = { c3 b9???????? e9???????? b8???????? e8???????? 51 6878010000 } // n = 7, score = 200 // c3 | ret // b9???????? | // e9???????? | // b8???????? | // e8???????? | // 51 | push ecx // 6878010000 | push 0x178 $sequence_3 = { 016c2410 eb29 663d2a00 750b } // n = 4, score = 200 // 016c2410 | add dword ptr [esp + 0x10], ebp // eb29 | jmp 0x2b // 663d2a00 | cmp ax, 0x2a // 750b | jne 0xd $sequence_4 = { ff442410 46 46 66833e00 } // n = 4, score = 200 // ff442410 | inc dword ptr [esp + 0x10] // 46 | inc esi // 46 | inc esi // 66833e00 | cmp word ptr [esi], 0 $sequence_5 = { b9???????? e9???????? c3 b8???????? e8???????? 51 6a3c } // n = 7, score = 200 // b9???????? | // e9???????? | // c3 | ret // b8???????? | // e8???????? | // 51 | push ecx // 6a3c | push 0x3c $sequence_6 = { 33ff 663bc7 897c2428 7446 } // n = 4, score = 200 // 33ff | xor edi, edi // 663bc7 | cmp ax, di // 897c2428 | mov dword ptr [esp + 0x28], edi // 7446 | je 0x48 $sequence_7 = { 33d2 c3 55 8bec 56 ff7514 e8???????? } // n = 7, score = 200 // 33d2 | xor edx, edx // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 56 | push esi // ff7514 | push dword ptr [ebp + 0x14] // e8???????? | $sequence_8 = { 56 57 8b703c 03f0 56 } // n = 5, score = 200 // 56 | push esi // 57 | push edi // 8b703c | mov esi, dword ptr [eax + 0x3c] // 03f0 | add esi, eax // 56 | push esi $sequence_9 = { 85ff 0f8449ffffff 85ed 7406 3bfd 7c02 8bfd } // n = 7, score = 200 // 85ff | test edi, edi // 0f8449ffffff | je 0xffffff4f // 85ed | test ebp, ebp // 7406 | je 8 // 3bfd | cmp edi, ebp // 7c02 | jl 4 // 8bfd | mov edi, ebp condition: 7 of them and filesize < 278528 }
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