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rule win_farseer_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 68c7000000 8d44244d 8bea 6a00 50 89742444 896c2448 } // n = 7, score = 100 // 68c7000000 | push 0xc7 // 8d44244d | lea eax, [esp + 0x4d] // 8bea | mov ebp, edx // 6a00 | push 0 // 50 | push eax // 89742444 | mov dword ptr [esp + 0x44], esi // 896c2448 | mov dword ptr [esp + 0x48], ebp $sequence_1 = { c1f905 8b0c8d20634200 c1e006 8d44010c 50 ff15???????? } // n = 6, score = 100 // c1f905 | sar ecx, 5 // 8b0c8d20634200 | mov ecx, dword ptr [ecx*4 + 0x426320] // c1e006 | shl eax, 6 // 8d44010c | lea eax, [ecx + eax + 0xc] // 50 | push eax // ff15???????? | $sequence_2 = { 0f8450020000 6803010000 8d8c240d090000 6a00 51 c684241409000000 e8???????? } // n = 7, score = 100 // 0f8450020000 | je 0x256 // 6803010000 | push 0x103 // 8d8c240d090000 | lea ecx, [esp + 0x90d] // 6a00 | push 0 // 51 | push ecx // c684241409000000 | mov byte ptr [esp + 0x914], 0 // e8???????? | $sequence_3 = { ff15???????? 6803010000 8d84241d020000 53 50 889c2424020000 e8???????? } // n = 7, score = 100 // ff15???????? | // 6803010000 | push 0x103 // 8d84241d020000 | lea eax, [esp + 0x21d] // 53 | push ebx // 50 | push eax // 889c2424020000 | mov byte ptr [esp + 0x224], bl // e8???????? | $sequence_4 = { 8d4c2478 e8???????? 8d442474 50 8d4c2450 51 c78424a000000002000000 } // n = 7, score = 100 // 8d4c2478 | lea ecx, [esp + 0x78] // e8???????? | // 8d442474 | lea eax, [esp + 0x74] // 50 | push eax // 8d4c2450 | lea ecx, [esp + 0x50] // 51 | push ecx // c78424a000000002000000 | mov dword ptr [esp + 0xa0], 2 $sequence_5 = { 8bc7 8b4c2470 64890d00000000 59 5e 5d 5b } // n = 7, score = 100 // 8bc7 | mov eax, edi // 8b4c2470 | mov ecx, dword ptr [esp + 0x70] // 64890d00000000 | mov dword ptr fs:[0], ecx // 59 | pop ecx // 5e | pop esi // 5d | pop ebp // 5b | pop ebx $sequence_6 = { 8d14c500000000 83c404 2bd0 a1???????? 8d0c90 890d???????? } // n = 6, score = 100 // 8d14c500000000 | lea edx, [eax*8] // 83c404 | add esp, 4 // 2bd0 | sub edx, eax // a1???????? | // 8d0c90 | lea ecx, [eax + edx*4] // 890d???????? | $sequence_7 = { 8b5004 c7440af49c064200 8b41fc 8b5004 c7440afc???????? 8b41f4 8b5004 } // n = 7, score = 100 // 8b5004 | mov edx, dword ptr [eax + 4] // c7440af49c064200 | mov dword ptr [edx + ecx - 0xc], 0x42069c // 8b41fc | mov eax, dword ptr [ecx - 4] // 8b5004 | mov edx, dword ptr [eax + 4] // c7440afc???????? | // 8b41f4 | mov eax, dword ptr [ecx - 0xc] // 8b5004 | mov edx, dword ptr [eax + 4] $sequence_8 = { 68d0070000 ff15???????? 8d8424c4010000 68???????? 50 e8???????? 83c408 } // n = 7, score = 100 // 68d0070000 | push 0x7d0 // ff15???????? | // 8d8424c4010000 | lea eax, [esp + 0x1c4] // 68???????? | // 50 | push eax // e8???????? | // 83c408 | add esp, 8 $sequence_9 = { 8d942408090000 52 ffd5 85c0 } // n = 4, score = 100 // 8d942408090000 | lea edx, [esp + 0x908] // 52 | push edx // ffd5 | call ebp // 85c0 | test eax, eax condition: 7 of them and filesize < 347328 }
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