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rule win_fakeword_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 8d7704 885f05 c60653 eb76 8b0d???????? 55 03c8 } // n = 7, score = 200 // 8d7704 | lea esi, [edi + 4] // 885f05 | mov byte ptr [edi + 5], bl // c60653 | mov byte ptr [esi], 0x53 // eb76 | jmp 0x78 // 8b0d???????? | // 55 | push ebp // 03c8 | add ecx, eax $sequence_1 = { 57 ffd6 8d542410 8be8 52 ffd6 03e8 } // n = 7, score = 200 // 57 | push edi // ffd6 | call esi // 8d542410 | lea edx, [esp + 0x10] // 8be8 | mov ebp, eax // 52 | push edx // ffd6 | call esi // 03e8 | add ebp, eax $sequence_2 = { c3 81fea3000000 7528 a1???????? 85c0 0f84dd010000 8b4c2450 } // n = 7, score = 200 // c3 | ret // 81fea3000000 | cmp esi, 0xa3 // 7528 | jne 0x2a // a1???????? | // 85c0 | test eax, eax // 0f84dd010000 | je 0x1e3 // 8b4c2450 | mov ecx, dword ptr [esp + 0x50] $sequence_3 = { eb3b 8b542450 68???????? 52 ff15???????? 5f b801000000 } // n = 7, score = 200 // eb3b | jmp 0x3d // 8b542450 | mov edx, dword ptr [esp + 0x50] // 68???????? | // 52 | push edx // ff15???????? | // 5f | pop edi // b801000000 | mov eax, 1 $sequence_4 = { 8d4801 890e 8b15???????? 2bd0 8915???????? e8???????? a1???????? } // n = 7, score = 200 // 8d4801 | lea ecx, [eax + 1] // 890e | mov dword ptr [esi], ecx // 8b15???????? | // 2bd0 | sub edx, eax // 8915???????? | // e8???????? | // a1???????? | $sequence_5 = { 59 c3 8b54241c 52 e8???????? } // n = 5, score = 200 // 59 | pop ecx // c3 | ret // 8b54241c | mov edx, dword ptr [esp + 0x1c] // 52 | push edx // e8???????? | $sequence_6 = { 68???????? e9???????? 8b542450 68???????? 52 ff15???????? } // n = 6, score = 200 // 68???????? | // e9???????? | // 8b542450 | mov edx, dword ptr [esp + 0x50] // 68???????? | // 52 | push edx // ff15???????? | $sequence_7 = { 85c0 7d10 56 ff15???????? 5f 83c8ff } // n = 6, score = 200 // 85c0 | test eax, eax // 7d10 | jge 0x12 // 56 | push esi // ff15???????? | // 5f | pop edi // 83c8ff | or eax, 0xffffffff $sequence_8 = { 8b442450 68???????? 50 ff15???????? 5f b801000000 5e } // n = 7, score = 200 // 8b442450 | mov eax, dword ptr [esp + 0x50] // 68???????? | // 50 | push eax // ff15???????? | // 5f | pop edi // b801000000 | mov eax, 1 // 5e | pop esi $sequence_9 = { f3ab b801000000 8d4c2408 8944245c 89442440 89442424 89442408 } // n = 7, score = 200 // f3ab | rep stosd dword ptr es:[edi], eax // b801000000 | mov eax, 1 // 8d4c2408 | lea ecx, [esp + 8] // 8944245c | mov dword ptr [esp + 0x5c], eax // 89442440 | mov dword ptr [esp + 0x40], eax // 89442424 | mov dword ptr [esp + 0x24], eax // 89442408 | mov dword ptr [esp + 8], eax condition: 7 of them and filesize < 98304 }
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