Actor(s): Kimsuki
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rule win_mydogs_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 3db7000000 0f8444010000 68???????? 6804010000 68???????? e8???????? } // n = 6, score = 200 // 3db7000000 | cmp eax, 0xb7 // 0f8444010000 | je 0x14a // 68???????? | // 6804010000 | push 0x104 // 68???????? | // e8???????? | $sequence_1 = { 884df3 c1fa18 8b5364 8bc2 8bce 0facc108 c1f808 } // n = 7, score = 200 // 884df3 | mov byte ptr [ebp - 0xd], cl // c1fa18 | sar edx, 0x18 // 8b5364 | mov edx, dword ptr [ebx + 0x64] // 8bc2 | mov eax, edx // 8bce | mov ecx, esi // 0facc108 | shrd ecx, eax, 8 // c1f808 | sar eax, 8 $sequence_2 = { 5d e9???????? 6a18 68???????? e8???????? 8b4508 8bd8 } // n = 7, score = 200 // 5d | pop ebp // e9???????? | // 6a18 | push 0x18 // 68???????? | // e8???????? | // 8b4508 | mov eax, dword ptr [ebp + 8] // 8bd8 | mov ebx, eax $sequence_3 = { 894e64 8b4dec 894650 894658 894660 8b45ee 8d49c4 } // n = 7, score = 200 // 894e64 | mov dword ptr [esi + 0x64], ecx // 8b4dec | mov ecx, dword ptr [ebp - 0x14] // 894650 | mov dword ptr [esi + 0x50], eax // 894658 | mov dword ptr [esi + 0x58], eax // 894660 | mov dword ptr [esi + 0x60], eax // 8b45ee | mov eax, dword ptr [ebp - 0x12] // 8d49c4 | lea ecx, [ecx - 0x3c] $sequence_4 = { 50 ffb5e4eeffff ffb5f8eeffff ff15???????? 85c0 7515 5f } // n = 7, score = 200 // 50 | push eax // ffb5e4eeffff | push dword ptr [ebp - 0x111c] // ffb5f8eeffff | push dword ptr [ebp - 0x1108] // ff15???????? | // 85c0 | test eax, eax // 7515 | jne 0x17 // 5f | pop edi $sequence_5 = { 8bf9 53 895ddc 897de0 e8???????? } // n = 5, score = 200 // 8bf9 | mov edi, ecx // 53 | push ebx // 895ddc | mov dword ptr [ebp - 0x24], ebx // 897de0 | mov dword ptr [ebp - 0x20], edi // e8???????? | $sequence_6 = { 8b4dfc 33cd e8???????? 8be5 5d c3 8d85f4eeffff } // n = 7, score = 200 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 33cd | xor ecx, ebp // e8???????? | // 8be5 | mov esp, ebp // 5d | pop ebp // c3 | ret // 8d85f4eeffff | lea eax, [ebp - 0x110c] $sequence_7 = { 50 8bcf c645ff4b e8???????? 6a01 8d450b 50 } // n = 7, score = 200 // 50 | push eax // 8bcf | mov ecx, edi // c645ff4b | mov byte ptr [ebp - 1], 0x4b // e8???????? | // 6a01 | push 1 // 8d450b | lea eax, [ebp + 0xb] // 50 | push eax $sequence_8 = { 1ddeb19d01 50 51 89530c e8???????? 894310 } // n = 6, score = 200 // 1ddeb19d01 | sbb eax, 0x19db1de // 50 | push eax // 51 | push ecx // 89530c | mov dword ptr [ebx + 0xc], edx // e8???????? | // 894310 | mov dword ptr [ebx + 0x10], eax $sequence_9 = { e8???????? 50 6800080000 53 89442434 e8???????? 83c414 } // n = 7, score = 200 // e8???????? | // 50 | push eax // 6800080000 | push 0x800 // 53 | push ebx // 89442434 | mov dword ptr [esp + 0x34], eax // e8???????? | // 83c414 | add esp, 0x14 condition: 7 of them and filesize < 313344 }
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