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rule win_mydoom_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.mydoom." 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.mydoom" 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 = { e8???????? ba00000000 85c0 740e } // n = 4, score = 100 // e8???????? | // ba00000000 | mov edx, 0 // 85c0 | test eax, eax // 740e | je 0x10 $sequence_1 = { 74e2 89442404 c70424???????? e8???????? } // n = 4, score = 100 // 74e2 | je 0xffffffe4 // 89442404 | mov dword ptr [esp + 4], eax // c70424???????? | // e8???????? | $sequence_2 = { 0f85cc010000 893424 e8???????? ba00000000 e9???????? } // n = 5, score = 100 // 0f85cc010000 | jne 0x1d2 // 893424 | mov dword ptr [esp], esi // e8???????? | // ba00000000 | mov edx, 0 // e9???????? | $sequence_3 = { 89d8 f3ab 8dbd08ffffff b90a000000 f3ab c7442404???????? } // n = 6, score = 100 // 89d8 | mov eax, ebx // f3ab | rep stosd dword ptr es:[edi], eax // 8dbd08ffffff | lea edi, dword ptr [ebp - 0xf8] // b90a000000 | mov ecx, 0xa // f3ab | rep stosd dword ptr es:[edi], eax // c7442404???????? | $sequence_4 = { 56 53 81ecc0000000 8b7508 } // n = 4, score = 100 // 56 | push esi // 53 | push ebx // 81ecc0000000 | sub esp, 0xc0 // 8b7508 | mov esi, dword ptr [ebp + 8] $sequence_5 = { 890424 e8???????? c9 83f801 } // n = 4, score = 100 // 890424 | mov dword ptr [esp], eax // e8???????? | // c9 | leave // 83f801 | cmp eax, 1 $sequence_6 = { 85c0 0f84cc000000 897c2410 8d85e0feffff 8944240c 89742408 } // n = 6, score = 100 // 85c0 | test eax, eax // 0f84cc000000 | je 0xd2 // 897c2410 | mov dword ptr [esp + 0x10], edi // 8d85e0feffff | lea eax, dword ptr [ebp - 0x120] // 8944240c | mov dword ptr [esp + 0xc], eax // 89742408 | mov dword ptr [esp + 8], esi $sequence_7 = { c744240496000000 8d8548ffffff 890424 e8???????? } // n = 4, score = 100 // c744240496000000 | mov dword ptr [esp + 4], 0x96 // 8d8548ffffff | lea eax, dword ptr [ebp - 0xb8] // 890424 | mov dword ptr [esp], eax // e8???????? | $sequence_8 = { 83ec08 ba00000000 85c0 0f85a1010000 c744240800000000 c744240401000000 c7042402000000 } // n = 7, score = 100 // 83ec08 | sub esp, 8 // ba00000000 | mov edx, 0 // 85c0 | test eax, eax // 0f85a1010000 | jne 0x1a7 // c744240800000000 | mov dword ptr [esp + 8], 0 // c744240401000000 | mov dword ptr [esp + 4], 1 // c7042402000000 | mov dword ptr [esp], 2 $sequence_9 = { c1f81f 29c2 8d0452 8d0482 01c0 29c1 0fbe5429b8 } // n = 7, score = 100 // c1f81f | sar eax, 0x1f // 29c2 | sub edx, eax // 8d0452 | lea eax, dword ptr [edx + edx*2] // 8d0482 | lea eax, dword ptr [edx + eax*4] // 01c0 | add eax, eax // 29c1 | sub ecx, eax // 0fbe5429b8 | movsx edx, byte ptr [ecx + ebp - 0x48] condition: 7 of them and filesize < 114688 }
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