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rule win_conficker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.conficker." 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.conficker" 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 = { 80fc05 75c5 fec8 74c1 80c204 ebbc } // n = 6, score = 300 // 80fc05 | cmp ah, 5 // 75c5 | jne 0xffffffc7 // fec8 | dec al // 74c1 | je 0xffffffc3 // 80c204 | add dl, 4 // ebbc | jmp 0xffffffbe $sequence_1 = { 3345f8 33c7 33c6 50 ff15???????? 59 5f } // n = 7, score = 300 // 3345f8 | xor eax, dword ptr [ebp - 8] // 33c7 | xor eax, edi // 33c6 | xor eax, esi // 50 | push eax // ff15???????? | // 59 | pop ecx // 5f | pop edi $sequence_2 = { 8b048e 8b1c8f 3bc3 7209 770e 49 79f1 } // n = 7, score = 300 // 8b048e | mov eax, dword ptr [esi + ecx*4] // 8b1c8f | mov ebx, dword ptr [edi + ecx*4] // 3bc3 | cmp eax, ebx // 7209 | jb 0xb // 770e | ja 0x10 // 49 | dec ecx // 79f1 | jns 0xfffffff3 $sequence_3 = { e8???????? 8bd0 83c410 85d2 0f8c9c000000 56 } // n = 6, score = 300 // e8???????? | // 8bd0 | mov edx, eax // 83c410 | add esp, 0x10 // 85d2 | test edx, edx // 0f8c9c000000 | jl 0xa2 // 56 | push esi $sequence_4 = { df6df8 8365f800 894dfc 2175fc d9e0 23cf dec1 } // n = 7, score = 300 // df6df8 | fild qword ptr [ebp - 8] // 8365f800 | and dword ptr [ebp - 8], 0 // 894dfc | mov dword ptr [ebp - 4], ecx // 2175fc | and dword ptr [ebp - 4], esi // d9e0 | fchs // 23cf | and ecx, edi // dec1 | faddp st(1) $sequence_5 = { e2f4 4a 0f8968ffffff 5f 5e 5d } // n = 6, score = 300 // e2f4 | loop 0xfffffff6 // 4a | dec edx // 0f8968ffffff | jns 0xffffff6e // 5f | pop edi // 5e | pop esi // 5d | pop ebp $sequence_6 = { 6812151110 6815111047 b815204712 50 50 68101a4712 } // n = 6, score = 300 // 6812151110 | push 0x10111512 // 6815111047 | push 0x47101115 // b815204712 | mov eax, 0x12472015 // 50 | push eax // 50 | push eax // 68101a4712 | push 0x12471a10 $sequence_7 = { 68???????? e8???????? 85c0 59 7513 68e8030000 } // n = 6, score = 300 // 68???????? | // e8???????? | // 85c0 | test eax, eax // 59 | pop ecx // 7513 | jne 0x15 // 68e8030000 | push 0x3e8 $sequence_8 = { 73f6 8a47ff 240f 3c0c 7503 5a } // n = 6, score = 300 // 73f6 | jae 0xfffffff8 // 8a47ff | mov al, byte ptr [edi - 1] // 240f | and al, 0xf // 3c0c | cmp al, 0xc // 7503 | jne 5 // 5a | pop edx $sequence_9 = { 51 d9e0 dec1 dc45e0 } // n = 4, score = 300 // 51 | push ecx // d9e0 | fchs // dec1 | faddp st(1) // dc45e0 | fadd qword ptr [ebp - 0x20] condition: 7 of them and filesize < 335872 }
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