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rule win_holerun_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.holerun." 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.holerun" 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 = { 488945f8 48837de007 0f8eba020000 48837de00b } // n = 4, score = 100 // 488945f8 | mov eax, dword ptr [ebp - 8] // 48837de007 | dec eax // 0f8eba020000 | add eax, 0x60 // 48837de00b | dec eax $sequence_1 = { 4883ec40 48894d10 488d053d780000 488b00 4889c1 e8???????? 488945f0 } // n = 7, score = 100 // 4883ec40 | mov eax, dword ptr [ebp - 0x10] // 48894d10 | dec eax // 488d053d780000 | cmp eax, -1 // 488b00 | jne 0x777 // 4889c1 | dec eax // e8???????? | // 488945f0 | mov dword ptr [ebp - 0x10], eax $sequence_2 = { c70001000000 e8???????? e8???????? 8945fc 90 90 } // n = 6, score = 100 // c70001000000 | dec eax // e8???????? | // e8???????? | // 8945fc | mov edi, edx // 90 | pop esi // 90 | pop edi $sequence_3 = { 488b45f8 4889c1 e8???????? 85c0 7507 b800000000 eb22 } // n = 7, score = 100 // 488b45f8 | mov eax, dword ptr [eax + 0x10] // 4889c1 | dec eax // e8???????? | // 85c0 | cmp eax, -1 // 7507 | jne 0x75d // b800000000 | dec eax // eb22 | mov edx, eax $sequence_4 = { e8???????? 8b05???????? 4881c4e0000000 5d c3 55 4889e5 } // n = 7, score = 100 // e8???????? | // 8b05???????? | // 4881c4e0000000 | cmp dword ptr [ebp - 0xc], 0 // 5d | jne 0x77 // c3 | jmp 0xb7 // 55 | dec eax // 4889e5 | add dword ptr [ebp - 8], 1 $sequence_5 = { 488955e8 8b45e0 83c001 4898 48c1e003 4889c1 } // n = 6, score = 100 // 488955e8 | jmp 0x2c9 // 8b45e0 | mov eax, 1 // 83c001 | dec eax // 4898 | add esp, 0x40 // 48c1e003 | pop ebp // 4889c1 | mov eax, 0 $sequence_6 = { 48894d10 488b4510 488905???????? 488b4d10 e8???????? } // n = 5, score = 100 // 48894d10 | dec eax // 488b4510 | mov eax, dword ptr [ebp + 0x10] // 488905???????? | // 488b4d10 | mov dword ptr [eax + 0x34], edx // e8???????? | $sequence_7 = { 4801d0 0fb600 8845e3 807de300 7419 807de320 } // n = 6, score = 100 // 4801d0 | arpl ax, dx // 0fb600 | dec eax // 8845e3 | mov eax, dword ptr [ebp - 0x10] // 807de300 | jne 0x626 // 7419 | dec eax // 807de320 | mov eax, dword ptr [ebp + 0xe0] $sequence_8 = { 4889e5 4883ec20 488b05???????? c70001000000 } // n = 4, score = 100 // 4889e5 | dec eax // 4883ec20 | mov dword ptr [ebp - 0x18], eax // 488b05???????? | // c70001000000 | dec eax $sequence_9 = { 7437 83f840 744a eb5f 488b45e0 488d55d0 } // n = 6, score = 100 // 7437 | dec eax // 83f840 | mov dword ptr [ebp - 0x18], eax // 744a | dec eax // eb5f | mov eax, dword ptr [ebp - 0x18] // 488b45e0 | movzx eax, word ptr [eax] // 488d55d0 | cmp ax, 0x20b condition: 7 of them and filesize < 156672 }
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