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rule win_fakeword_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.fakeword." 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.fakeword" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 0f84f6010000 57 e8???????? 83c404 85c0 0f84e5010000 } // n = 6, score = 200 // 0f84f6010000 | je 0x1fc // 57 | push edi // e8???????? | // 83c404 | add esp, 4 // 85c0 | test eax, eax // 0f84e5010000 | je 0x1eb $sequence_1 = { 89442410 894c2414 0f8675ffffff 8b2d???????? 8bfb 33f6 } // n = 6, score = 200 // 89442410 | mov dword ptr [esp + 0x10], eax // 894c2414 | mov dword ptr [esp + 0x14], ecx // 0f8675ffffff | jbe 0xffffff7b // 8b2d???????? | // 8bfb | mov edi, ebx // 33f6 | xor esi, esi $sequence_2 = { 83c408 85c0 7570 56 55 e8???????? } // n = 6, score = 200 // 83c408 | add esp, 8 // 85c0 | test eax, eax // 7570 | jne 0x72 // 56 | push esi // 55 | push ebp // e8???????? | $sequence_3 = { 83c440 c3 83fe60 0f82cc000000 83fe6f 0f87c3000000 83fe6a } // n = 7, score = 200 // 83c440 | add esp, 0x40 // c3 | ret // 83fe60 | cmp esi, 0x60 // 0f82cc000000 | jb 0xd2 // 83fe6f | cmp esi, 0x6f // 0f87c3000000 | ja 0xc9 // 83fe6a | cmp esi, 0x6a $sequence_4 = { 56 8d4610 6a04 50 } // n = 4, score = 200 // 56 | push esi // 8d4610 | lea eax, [esi + 0x10] // 6a04 | push 4 // 50 | push eax $sequence_5 = { ff15???????? 8b7c2414 8d7704 885f05 c60653 e9???????? 33f6 } // n = 7, score = 200 // ff15???????? | // 8b7c2414 | mov edi, dword ptr [esp + 0x14] // 8d7704 | lea esi, [edi + 4] // 885f05 | mov byte ptr [edi + 5], bl // c60653 | mov byte ptr [esi], 0x53 // e9???????? | // 33f6 | xor esi, esi $sequence_6 = { 8d8c2470030000 51 ff15???????? 85c0 } // n = 4, score = 200 // 8d8c2470030000 | lea ecx, [esp + 0x370] // 51 | push ecx // ff15???????? | // 85c0 | test eax, eax $sequence_7 = { 668944244c b802000000 8944246c 89442434 ff15???????? } // n = 5, score = 200 // 668944244c | mov word ptr [esp + 0x4c], ax // b802000000 | mov eax, 2 // 8944246c | mov dword ptr [esp + 0x6c], eax // 89442434 | mov dword ptr [esp + 0x34], eax // ff15???????? | $sequence_8 = { 89442478 0f855cffffff 8d4504 50 ff15???????? 40 } // n = 6, score = 200 // 89442478 | mov dword ptr [esp + 0x78], eax // 0f855cffffff | jne 0xffffff62 // 8d4504 | lea eax, [ebp + 4] // 50 | push eax // ff15???????? | // 40 | inc eax $sequence_9 = { 751f ff15???????? 8b35???????? 57 ffd6 55 ffd6 } // n = 7, score = 200 // 751f | jne 0x21 // ff15???????? | // 8b35???????? | // 57 | push edi // ffd6 | call esi // 55 | push ebp // ffd6 | call esi condition: 7 of them and filesize < 98304 }
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