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rule win_farseer_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.farseer." 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.farseer" 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 = { 8d8424d4020000 64a300000000 33f6 6803010000 } // n = 4, score = 100 // 8d8424d4020000 | lea eax, dword ptr [esp + 0x2d4] // 64a300000000 | mov dword ptr fs:[0], eax // 33f6 | xor esi, esi // 6803010000 | push 0x103 $sequence_1 = { 33f6 eb04 33f6 33c0 0fbe84c150ed4100 6a07 } // n = 6, score = 100 // 33f6 | xor esi, esi // eb04 | jmp 6 // 33f6 | xor esi, esi // 33c0 | xor eax, eax // 0fbe84c150ed4100 | movsx eax, byte ptr [ecx + eax*8 + 0x41ed50] // 6a07 | push 7 $sequence_2 = { 8bc3 c1f805 8d048520634200 83e31f 8985e4efffff 8b00 } // n = 6, score = 100 // 8bc3 | mov eax, ebx // c1f805 | sar eax, 5 // 8d048520634200 | lea eax, dword ptr [eax*4 + 0x426320] // 83e31f | and ebx, 0x1f // 8985e4efffff | mov dword ptr [ebp - 0x101c], eax // 8b00 | mov eax, dword ptr [eax] $sequence_3 = { 897918 895914 52 8d742440 885904 e8???????? } // n = 6, score = 100 // 897918 | mov dword ptr [ecx + 0x18], edi // 895914 | mov dword ptr [ecx + 0x14], ebx // 52 | push edx // 8d742440 | lea esi, dword ptr [esp + 0x40] // 885904 | mov byte ptr [ecx + 4], bl // e8???????? | $sequence_4 = { 89ac2460040000 837c245010 720d 8b54243c 52 e8???????? 83c404 } // n = 7, score = 100 // 89ac2460040000 | mov dword ptr [esp + 0x460], ebp // 837c245010 | cmp dword ptr [esp + 0x50], 0x10 // 720d | jb 0xf // 8b54243c | mov edx, dword ptr [esp + 0x3c] // 52 | push edx // e8???????? | // 83c404 | add esp, 4 $sequence_5 = { 50 ff15???????? 8b8c2428060000 5e 5b } // n = 5, score = 100 // 50 | push eax // ff15???????? | // 8b8c2428060000 | mov ecx, dword ptr [esp + 0x628] // 5e | pop esi // 5b | pop ebx $sequence_6 = { 8d14c500000000 83c404 2bd0 a1???????? 8d0c90 890d???????? } // n = 6, score = 100 // 8d14c500000000 | lea edx, dword ptr [eax*8] // 83c404 | add esp, 4 // 2bd0 | sub edx, eax // a1???????? | // 8d0c90 | lea ecx, dword ptr [eax + edx*4] // 890d???????? | $sequence_7 = { f7ee 03d6 c1fa04 8bf2 c1ee1f 03f2 3bfe } // n = 7, score = 100 // f7ee | imul esi // 03d6 | add edx, esi // c1fa04 | sar edx, 4 // 8bf2 | mov esi, edx // c1ee1f | shr esi, 0x1f // 03f2 | add esi, edx // 3bfe | cmp edi, esi $sequence_8 = { 8d7c2458 e8???????? 56 33c9 8d74243c 8d942490000000 } // n = 6, score = 100 // 8d7c2458 | lea edi, dword ptr [esp + 0x58] // e8???????? | // 56 | push esi // 33c9 | xor ecx, ecx // 8d74243c | lea esi, dword ptr [esp + 0x3c] // 8d942490000000 | lea edx, dword ptr [esp + 0x90] $sequence_9 = { e8???????? 83c404 33c0 8b8c246c010000 64890d00000000 59 5f } // n = 7, score = 100 // e8???????? | // 83c404 | add esp, 4 // 33c0 | xor eax, eax // 8b8c246c010000 | mov ecx, dword ptr [esp + 0x16c] // 64890d00000000 | mov dword ptr fs:[0], ecx // 59 | pop ecx // 5f | pop edi condition: 7 of them and filesize < 347328 }
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