Actor(s): Kimsuki
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rule win_mydogs_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.mydogs." 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.mydogs" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 8d450b 50 8bcf e8???????? 0fb64634 88450b } // n = 6, score = 200 // 8d450b | lea eax, [ebp + 0xb] // 50 | push eax // 8bcf | mov ecx, edi // e8???????? | // 0fb64634 | movzx eax, byte ptr [esi + 0x34] // 88450b | mov byte ptr [ebp + 0xb], al $sequence_1 = { 8d8594fdffff 50 ff15???????? a1???????? 0f57c0 660fd645bd } // n = 6, score = 200 // 8d8594fdffff | lea eax, [ebp - 0x26c] // 50 | push eax // ff15???????? | // a1???????? | // 0f57c0 | xorps xmm0, xmm0 // 660fd645bd | movq qword ptr [ebp - 0x43], xmm0 $sequence_2 = { 8bcf c645ff50 e8???????? 6a01 8d45ff } // n = 5, score = 200 // 8bcf | mov ecx, edi // c645ff50 | mov byte ptr [ebp - 1], 0x50 // e8???????? | // 6a01 | push 1 // 8d45ff | lea eax, [ebp - 1] $sequence_3 = { 8be5 5d c3 8b45b4 33f6 8bd0 83e201 } // n = 7, score = 200 // 8be5 | mov esp, ebp // 5d | pop ebp // c3 | ret // 8b45b4 | mov eax, dword ptr [ebp - 0x4c] // 33f6 | xor esi, esi // 8bd0 | mov edx, eax // 83e201 | and edx, 1 $sequence_4 = { 895304 e8???????? 8b4db8 894308 8b45bc 6a00 81e900803ed5 } // n = 7, score = 200 // 895304 | mov dword ptr [ebx + 4], edx // e8???????? | // 8b4db8 | mov ecx, dword ptr [ebp - 0x48] // 894308 | mov dword ptr [ebx + 8], eax // 8b45bc | mov eax, dword ptr [ebp - 0x44] // 6a00 | push 0 // 81e900803ed5 | sub ecx, 0xd53e8000 $sequence_5 = { 8bcf c645ff4b e8???????? 6a01 8d450b 50 8bcf } // n = 7, score = 200 // 8bcf | mov ecx, edi // c645ff4b | mov byte ptr [ebp - 1], 0x4b // e8???????? | // 6a01 | push 1 // 8d450b | lea eax, [ebp + 0xb] // 50 | push eax // 8bcf | mov ecx, edi $sequence_6 = { 50 8d564c 8bcf e8???????? 83c40c 85c0 } // n = 6, score = 200 // 50 | push eax // 8d564c | lea edx, [esi + 0x4c] // 8bcf | mov ecx, edi // e8???????? | // 83c40c | add esp, 0xc // 85c0 | test eax, eax $sequence_7 = { f6460c40 755e 56 e8???????? 59 8bc8 } // n = 6, score = 200 // f6460c40 | test byte ptr [esi + 0xc], 0x40 // 755e | jne 0x60 // 56 | push esi // e8???????? | // 59 | pop ecx // 8bc8 | mov ecx, eax $sequence_8 = { 8bf8 85ff 742b 6a00 6800000008 6a01 } // n = 6, score = 200 // 8bf8 | mov edi, eax // 85ff | test edi, edi // 742b | je 0x2d // 6a00 | push 0 // 6800000008 | push 0x8000000 // 6a01 | push 1 $sequence_9 = { 740e 83f806 7409 83f805 0f857a030000 } // n = 5, score = 200 // 740e | je 0x10 // 83f806 | cmp eax, 6 // 7409 | je 0xb // 83f805 | cmp eax, 5 // 0f857a030000 | jne 0x380 condition: 7 of them and filesize < 313344 }
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