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rule win_conficker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 46 3bf7 7ce9 c6043b00 5f 5e 5b } // n = 7, score = 300 // 46 | inc esi // 3bf7 | cmp esi, edi // 7ce9 | jl 0xffffffeb // c6043b00 | mov byte ptr [ebx + edi], 0 // 5f | pop edi // 5e | pop esi // 5b | pop ebx $sequence_1 = { e8???????? 59 99 6a1a } // n = 4, score = 300 // e8???????? | // 59 | pop ecx // 99 | cdq // 6a1a | push 0x1a $sequence_2 = { 8d44004c 50 6a40 ff15???????? 8bf0 } // n = 5, score = 300 // 8d44004c | lea eax, [eax + eax + 0x4c] // 50 | push eax // 6a40 | push 0x40 // ff15???????? | // 8bf0 | mov esi, eax $sequence_3 = { 80e407 60 b067 f2ae } // n = 4, score = 300 // 80e407 | and ah, 7 // 60 | pushal // b067 | mov al, 0x67 // f2ae | repne scasb al, byte ptr es:[edi] $sequence_4 = { 6811f0f050 b910471215 51 6847121511 } // n = 4, score = 300 // 6811f0f050 | push 0x50f0f011 // b910471215 | mov ecx, 0x15124710 // 51 | push ecx // 6847121511 | push 0x11151247 $sequence_5 = { 742b 3c07 742f 3c0b 747e 42 3c03 } // n = 7, score = 300 // 742b | je 0x2d // 3c07 | cmp al, 7 // 742f | je 0x31 // 3c0b | cmp al, 0xb // 747e | je 0x80 // 42 | inc edx // 3c03 | cmp al, 3 $sequence_6 = { 743b 8bce 81e1fffe0000 81f9c6120000 } // n = 4, score = 300 // 743b | je 0x3d // 8bce | mov ecx, esi // 81e1fffe0000 | and ecx, 0xfeff // 81f9c6120000 | cmp ecx, 0x12c6 $sequence_7 = { 42 60 b066 f2ae 61 7502 4a } // n = 7, score = 300 // 42 | inc edx // 60 | pushal // b066 | mov al, 0x66 // f2ae | repne scasb al, byte ptr es:[edi] // 61 | popal // 7502 | jne 4 // 4a | dec edx $sequence_8 = { 681c701c20 682b606747 6811102120 6825161240 6822208782 } // n = 5, score = 300 // 681c701c20 | push 0x201c701c // 682b606747 | push 0x4767602b // 6811102120 | push 0x20211011 // 6825161240 | push 0x40121625 // 6822208782 | push 0x82872022 $sequence_9 = { d3e8 a801 7443 8b7d08 } // n = 4, score = 300 // d3e8 | shr eax, cl // a801 | test al, 1 // 7443 | je 0x45 // 8b7d08 | mov edi, dword ptr [ebp + 8] condition: 7 of them and filesize < 335872 }
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