Actor(s): Naikon
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rule win_winmm_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { c3 b9???????? e9???????? b8???????? e8???????? 51 6878010000 } // n = 7, score = 200 // c3 | ret // b9???????? | // e9???????? | // b8???????? | // e8???????? | // 51 | push ecx // 6878010000 | push 0x178 $sequence_1 = { 81fe000c0000 7607 be000c0000 eb04 85f6 } // n = 5, score = 200 // 81fe000c0000 | cmp esi, 0xc00 // 7607 | jbe 9 // be000c0000 | mov esi, 0xc00 // eb04 | jmp 6 // 85f6 | test esi, esi $sequence_2 = { 83e811 0f84ee000000 83e80c 0f84e5000000 48 0f84a9000000 } // n = 6, score = 200 // 83e811 | sub eax, 0x11 // 0f84ee000000 | je 0xf4 // 83e80c | sub eax, 0xc // 0f84e5000000 | je 0xeb // 48 | dec eax // 0f84a9000000 | je 0xaf $sequence_3 = { c701???????? c3 8b442404 56 8bf1 } // n = 5, score = 200 // c701???????? | // c3 | ret // 8b442404 | mov eax, dword ptr [esp + 4] // 56 | push esi // 8bf1 | mov esi, ecx $sequence_4 = { 68???????? ffd7 50 e8???????? 8bf0 } // n = 5, score = 200 // 68???????? | // ffd7 | call edi // 50 | push eax // e8???????? | // 8bf0 | mov esi, eax $sequence_5 = { 0f84af000000 2bc1 0f849f000000 2bc1 745a } // n = 5, score = 200 // 0f84af000000 | je 0xb5 // 2bc1 | sub eax, ecx // 0f849f000000 | je 0xa5 // 2bc1 | sub eax, ecx // 745a | je 0x5c $sequence_6 = { c20400 ff742404 b9???????? e8???????? c3 e8???????? 8b4004 } // n = 7, score = 200 // c20400 | ret 4 // ff742404 | push dword ptr [esp + 4] // b9???????? | // e8???????? | // c3 | ret // e8???????? | // 8b4004 | mov eax, dword ptr [eax + 4] $sequence_7 = { 46 8364241400 6a03 68???????? 56 e8???????? } // n = 6, score = 200 // 46 | inc esi // 8364241400 | and dword ptr [esp + 0x14], 0 // 6a03 | push 3 // 68???????? | // 56 | push esi // e8???????? | $sequence_8 = { 397c2428 7522 56 e8???????? 59 89442428 668b06 } // n = 7, score = 200 // 397c2428 | cmp dword ptr [esp + 0x28], edi // 7522 | jne 0x24 // 56 | push esi // e8???????? | // 59 | pop ecx // 89442428 | mov dword ptr [esp + 0x28], eax // 668b06 | mov ax, word ptr [esi] $sequence_9 = { 7c02 8bfd 3b7c2428 7f5a 8b7c2428 } // n = 5, score = 200 // 7c02 | jl 4 // 8bfd | mov edi, ebp // 3b7c2428 | cmp edi, dword ptr [esp + 0x28] // 7f5a | jg 0x5c // 8b7c2428 | mov edi, dword ptr [esp + 0x28] condition: 7 of them and filesize < 278528 }
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