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rule win_conficker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { ebe4 f60638 75a8 b008 d0ef 1400 } // n = 6, score = 300 // ebe4 | jmp 0xffffffe6 // f60638 | test byte ptr [esi], 0x38 // 75a8 | jne 0xffffffaa // b008 | mov al, 8 // d0ef | shr bh, 1 // 1400 | adc al, 0 $sequence_1 = { df6de8 51 df6df8 51 } // n = 4, score = 300 // df6de8 | fild qword ptr [ebp - 0x18] // 51 | push ecx // df6df8 | fild qword ptr [ebp - 8] // 51 | push ecx $sequence_2 = { 8bec 83ec20 8b0d???????? a1???????? 8365f800 56 } // n = 6, score = 300 // 8bec | mov ebp, esp // 83ec20 | sub esp, 0x20 // 8b0d???????? | // a1???????? | // 8365f800 | and dword ptr [ebp - 8], 0 // 56 | push esi $sequence_3 = { 3c04 7415 42 42 60 b066 f2ae } // n = 7, score = 300 // 3c04 | cmp al, 4 // 7415 | je 0x17 // 42 | inc edx // 42 | inc edx // 60 | pushal // b066 | mov al, 0x66 // f2ae | repne scasb al, byte ptr es:[edi] $sequence_4 = { c3 6a10 68???????? e8???????? 68???????? ff15???????? } // n = 6, score = 300 // c3 | ret // 6a10 | push 0x10 // 68???????? | // e8???????? | // 68???????? | // ff15???????? | $sequence_5 = { 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_6 = { 8b4508 33d2 8910 895004 33c9 894c8808 41 } // n = 7, score = 300 // 8b4508 | mov eax, dword ptr [ebp + 8] // 33d2 | xor edx, edx // 8910 | mov dword ptr [eax], edx // 895004 | mov dword ptr [eax + 4], edx // 33c9 | xor ecx, ecx // 894c8808 | mov dword ptr [eax + ecx*4 + 8], ecx // 41 | inc ecx $sequence_7 = { 8d85f8fbffff ff7510 50 e8???????? } // n = 4, score = 300 // 8d85f8fbffff | lea eax, [ebp - 0x408] // ff7510 | push dword ptr [ebp + 0x10] // 50 | push eax // e8???????? | $sequence_8 = { 8954241c 61 c3 ac } // n = 4, score = 300 // 8954241c | mov dword ptr [esp + 0x1c], edx // 61 | popal // c3 | ret // ac | lodsb al, byte ptr [esi] $sequence_9 = { 55 8bec 83ec20 8b0d???????? a1???????? } // n = 5, score = 300 // 55 | push ebp // 8bec | mov ebp, esp // 83ec20 | sub esp, 0x20 // 8b0d???????? | // a1???????? | condition: 7 of them and filesize < 335872 }
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