Actor(s): Winnti Umbrella
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rule win_pipemon_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.pipemon." 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.pipemon" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 660f1f840000000000 b9e8030000 ff15???????? 488d542460 488d8d00030000 ff15???????? 85c0 } // n = 7, score = 100 // 660f1f840000000000 | test eax, eax // b9e8030000 | jne 0x33b // ff15???????? | // 488d542460 | dec eax // 488d8d00030000 | mov dword ptr [ebp - 0x80], eax // ff15???????? | // 85c0 | dec eax $sequence_1 = { 74c8 488bd3 4c8d05befe0000 83e23f 488bcb } // n = 5, score = 100 // 74c8 | inc eax // 488bd3 | xor bh, bh // 4c8d05befe0000 | dec eax // 83e23f | lea edx, [0x1e437] // 488bcb | dec eax $sequence_2 = { c3 488d0d8ddb0100 e8???????? cc 488d0d80db0100 e8???????? cc } // n = 7, score = 100 // c3 | call ebx // 488d0d8ddb0100 | dec eax // e8???????? | // cc | mov edi, dword ptr [esp + 0x60] // 488d0d80db0100 | dec eax // e8???????? | // cc | mov eax, ebx $sequence_3 = { 0f843f020000 448b4320 488d15fcf50100 488d8d60030000 e8???????? 488d7b28 } // n = 6, score = 100 // 0f843f020000 | jne 0x106 // 448b4320 | nop word ptr [eax + eax] // 488d15fcf50100 | cmp dword ptr [eax + 0x20], ecx // 488d8d60030000 | jae 0xf0 // e8???????? | // 488d7b28 | dec eax $sequence_4 = { c3 83f801 7529 b803000000 488b8c2440010000 4833cc e8???????? } // n = 7, score = 100 // c3 | dec eax // 83f801 | add esp, 0x78 // 7529 | dec esp // b803000000 | mov eax, dword ptr [ebp + 0x1d0] // 488b8c2440010000 | dec ebp // 4833cc | mov ecx, eax // e8???????? | $sequence_5 = { 488bcf ff15???????? 85c0 7511 488d0d8b0a0200 e8???????? } // n = 6, score = 100 // 488bcf | inc ebp // ff15???????? | // 85c0 | mov esp, eax // 7511 | inc ecx // 488d0d8b0a0200 | push edi // e8???????? | $sequence_6 = { ebdd 4533ff 418bdf 4c8d0de268ffff 4885db 750d } // n = 6, score = 100 // ebdd | jmp 0x878 // 4533ff | dec eax // 418bdf | mov eax, ebx // 4c8d0de268ffff | mov word ptr [ebx], si // 4885db | jb 0x852 // 750d | dec eax $sequence_7 = { ff15???????? 90 4c8b442440 4d8bc8 4d8b00 488d95f0010000 } // n = 6, score = 100 // ff15???????? | // 90 | dec eax // 4c8b442440 | mov eax, dword ptr [eax] // 4d8bc8 | cmp byte ptr [eax + 0x19], 0 // 4d8b00 | cmp byte ptr [eax + 0x19], 0 // 488d95f0010000 | jne 0x2ca $sequence_8 = { 498d4608 4d85f6 490f44c6 48833e00 4c8bf0 0f855effffff } // n = 6, score = 100 // 498d4608 | dec eax // 4d85f6 | add eax, eax // 490f44c6 | dec eax // 48833e00 | lea ecx, [0x9092] // 4c8bf0 | mov eax, dword ptr [ecx + eax*8] // 0f855effffff | jmp 0x462 $sequence_9 = { 752d 418b4020 413901 0f836e010000 488b842480000000 } // n = 5, score = 100 // 752d | dec eax // 418b4020 | lea edx, [0x10dc6] // 413901 | mov ecx, 7 // 0f836e010000 | dec esp // 488b842480000000 | lea eax, [0x10db2] condition: 7 of them and filesize < 389120 }
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