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rule win_mydoom_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 89442404 891c24 e8???????? 85c0 0f849f000000 } // n = 5, score = 100 // 89442404 | mov dword ptr [esp + 4], eax // 891c24 | mov dword ptr [esp], ebx // e8???????? | // 85c0 | test eax, eax // 0f849f000000 | je 0xa5 $sequence_1 = { 89442408 c7442404???????? 891c24 e8???????? ba00000000 85c0 } // n = 6, score = 100 // 89442408 | mov dword ptr [esp + 8], eax // c7442404???????? | // 891c24 | mov dword ptr [esp], ebx // e8???????? | // ba00000000 | mov edx, 0 // 85c0 | test eax, eax $sequence_2 = { 893424 e8???????? ba00000000 e9???????? 8b420c 8b00 8b00 } // n = 7, score = 100 // 893424 | mov dword ptr [esp], esi // e8???????? | // ba00000000 | mov edx, 0 // e9???????? | // 8b420c | mov eax, dword ptr [edx + 0xc] // 8b00 | mov eax, dword ptr [eax] // 8b00 | mov eax, dword ptr [eax] $sequence_3 = { 83ec18 c744241400000000 c744241000000000 8b450c 8944240c 8b4508 89442408 } // n = 7, score = 100 // 83ec18 | sub esp, 0x18 // c744241400000000 | mov dword ptr [esp + 0x14], 0 // c744241000000000 | mov dword ptr [esp + 0x10], 0 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 8944240c | mov dword ptr [esp + 0xc], eax // 8b4508 | mov eax, dword ptr [ebp + 8] // 89442408 | mov dword ptr [esp + 8], eax $sequence_4 = { c744240400000000 c7042400000000 e8???????? 83ec18 8d45fc 89442414 c744241000000000 } // n = 7, score = 100 // c744240400000000 | mov dword ptr [esp + 4], 0 // c7042400000000 | mov dword ptr [esp], 0 // e8???????? | // 83ec18 | sub esp, 0x18 // 8d45fc | lea eax, [ebp - 4] // 89442414 | mov dword ptr [esp + 0x14], eax // c744241000000000 | mov dword ptr [esp + 0x10], 0 $sequence_5 = { 55 89e5 83ec08 e8???????? e8???????? e8???????? b800000000 } // n = 7, score = 100 // 55 | push ebp // 89e5 | mov ebp, esp // 83ec08 | sub esp, 8 // e8???????? | // e8???????? | // e8???????? | // b800000000 | mov eax, 0 $sequence_6 = { 83ec58 895df4 8975f8 897dfc 8b7510 0fb74514 668945e6 } // n = 7, score = 100 // 83ec58 | sub esp, 0x58 // 895df4 | mov dword ptr [ebp - 0xc], ebx // 8975f8 | mov dword ptr [ebp - 8], esi // 897dfc | mov dword ptr [ebp - 4], edi // 8b7510 | mov esi, dword ptr [ebp + 0x10] // 0fb74514 | movzx eax, word ptr [ebp + 0x14] // 668945e6 | mov word ptr [ebp - 0x1a], ax $sequence_7 = { 8845d2 8d45d8 890424 e8???????? 83ec04 e8???????? } // n = 6, score = 100 // 8845d2 | mov byte ptr [ebp - 0x2e], al // 8d45d8 | lea eax, [ebp - 0x28] // 890424 | mov dword ptr [esp], eax // e8???????? | // 83ec04 | sub esp, 4 // e8???????? | $sequence_8 = { 895df4 8975f8 897dfc 8b7d08 8b750c c645f3ff c744240802000000 } // n = 7, score = 100 // 895df4 | mov dword ptr [ebp - 0xc], ebx // 8975f8 | mov dword ptr [ebp - 8], esi // 897dfc | mov dword ptr [ebp - 4], edi // 8b7d08 | mov edi, dword ptr [ebp + 8] // 8b750c | mov esi, dword ptr [ebp + 0xc] // c645f3ff | mov byte ptr [ebp - 0xd], 0xff // c744240802000000 | mov dword ptr [esp + 8], 2 $sequence_9 = { 89c6 83f8ff 0f8472010000 8dbdf8feffff fc bb00000000 b904000000 } // n = 7, score = 100 // 89c6 | mov esi, eax // 83f8ff | cmp eax, -1 // 0f8472010000 | je 0x178 // 8dbdf8feffff | lea edi, [ebp - 0x108] // fc | cld // bb00000000 | mov ebx, 0 // b904000000 | mov ecx, 4 condition: 7 of them and filesize < 114688 }
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