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rule win_mydoom_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 0f94c0 09d0 a801 740a } // n = 4, score = 100 // 0f94c0 | sete al // 09d0 | or eax, edx // a801 | test al, 1 // 740a | je 0xc $sequence_1 = { 8d9da8feffff 891c24 e8???????? 895c2408 c744240496000000 8d9d48ffffff } // n = 6, score = 100 // 8d9da8feffff | lea ebx, [ebp - 0x158] // 891c24 | mov dword ptr [esp], ebx // e8???????? | // 895c2408 | mov dword ptr [esp + 8], ebx // c744240496000000 | mov dword ptr [esp + 4], 0x96 // 8d9d48ffffff | lea ebx, [ebp - 0xb8] $sequence_2 = { 01c0 29c6 0fb6442eb8 884707 e8???????? 89c6 } // n = 6, score = 100 // 01c0 | add eax, eax // 29c6 | sub esi, eax // 0fb6442eb8 | movzx eax, byte ptr [esi + ebp - 0x48] // 884707 | mov byte ptr [edi + 7], al // e8???????? | // 89c6 | mov esi, eax $sequence_3 = { e8???????? 83ec10 c744241800000000 c744241480000000 } // n = 4, score = 100 // e8???????? | // 83ec10 | sub esp, 0x10 // c744241800000000 | mov dword ptr [esp + 0x18], 0 // c744241480000000 | mov dword ptr [esp + 0x14], 0x80 $sequence_4 = { 83ec24 ba00000000 85c0 7553 893424 e8???????? 83ec04 } // n = 7, score = 100 // 83ec24 | sub esp, 0x24 // ba00000000 | mov edx, 0 // 85c0 | test eax, eax // 7553 | jne 0x55 // 893424 | mov dword ptr [esp], esi // e8???????? | // 83ec04 | sub esp, 4 $sequence_5 = { 83ec20 8b5d08 8b7510 8d45f4 89442410 } // n = 5, score = 100 // 83ec20 | sub esp, 0x20 // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 8b7510 | mov esi, dword ptr [ebp + 0x10] // 8d45f4 | lea eax, [ebp - 0xc] // 89442410 | mov dword ptr [esp + 0x10], eax $sequence_6 = { 893424 e8???????? 893424 e8???????? 83ec04 80bc2807feffff5c } // n = 6, score = 100 // 893424 | mov dword ptr [esp], esi // e8???????? | // 893424 | mov dword ptr [esp], esi // e8???????? | // 83ec04 | sub esp, 4 // 80bc2807feffff5c | cmp byte ptr [eax + ebp - 0x1f9], 0x5c $sequence_7 = { a801 756b 0fbec3 89442408 89742404 893c24 } // n = 6, score = 100 // a801 | test al, 1 // 756b | jne 0x6d // 0fbec3 | movsx eax, bl // 89442408 | mov dword ptr [esp + 8], eax // 89742404 | mov dword ptr [esp + 4], esi // 893c24 | mov dword ptr [esp], edi $sequence_8 = { 66837de631 770c e8???????? 8db40630240000 0fb745e6 83e833 663d9400 } // n = 7, score = 100 // 66837de631 | cmp word ptr [ebp - 0x1a], 0x31 // 770c | ja 0xe // e8???????? | // 8db40630240000 | lea esi, [esi + eax + 0x2430] // 0fb745e6 | movzx eax, word ptr [ebp - 0x1a] // 83e833 | sub eax, 0x33 // 663d9400 | cmp ax, 0x94 $sequence_9 = { c1f81f 29c2 8d0452 8d0482 01c0 29c1 0fbe5429b8 } // n = 7, score = 100 // c1f81f | sar eax, 0x1f // 29c2 | sub edx, eax // 8d0452 | lea eax, [edx + edx*2] // 8d0482 | lea eax, [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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