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rule win_owlproxy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.owlproxy." 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.owlproxy" 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 = { 488905???????? 4885c0 7420 488d1511fd0000 488bcb ff15???????? 488bc8 } // n = 7, score = 200 // 488905???????? | // 4885c0 | mov esi, dword ptr [esp + 0x38] // 7420 | dec eax // 488d1511fd0000 | mov dword ptr [edi + 8], eax // 488bcb | dec eax // ff15???????? | // 488bc8 | add esp, 0x48 $sequence_1 = { ff15???????? 3de5030000 7407 3d47270000 7528 03df 3bde } // n = 7, score = 200 // ff15???????? | // 3de5030000 | mov eax, esi // 7407 | dec eax // 3d47270000 | add esp, 0x50 // 7528 | inc ecx // 03df | pop esi // 3bde | pop esi $sequence_2 = { 8bd3 498bce 4d8b0f 4889442420 e8???????? 488d0575340100 4c3bf8 } // n = 7, score = 200 // 8bd3 | mov ebx, eax // 498bce | inc esp // 4d8b0f | mov edi, eax // 4889442420 | test eax, eax // e8???????? | // 488d0575340100 | jne 0x63b // 4c3bf8 | dec eax $sequence_3 = { 488bcb 488905???????? ff15???????? 488d1527580100 483305???????? 488bcb 488905???????? } // n = 7, score = 200 // 488bcb | dec eax // 488905???????? | // ff15???????? | // 488d1527580100 | mov dword ptr [esp + 0x28], eax // 483305???????? | // 488bcb | dec eax // 488905???????? | $sequence_4 = { 443af8 750b 48ffc7 48ffc3 } // n = 4, score = 200 // 443af8 | sub esp, 0xb0 // 750b | dec eax // 48ffc7 | mov dword ptr [ebp - 0x21], 0xfffffffe // 48ffc3 | inc ecx $sequence_5 = { 4889442438 488bf9 488b4908 488bda 4c8d442420 488d542428 } // n = 6, score = 200 // 4889442438 | dec eax // 488bf9 | lea ebp, [0x16c11] // 488b4908 | mov edx, 0x55 // 488bda | test eax, eax // 4c8d442420 | jg 0x7dd // 488d542428 | dec eax $sequence_6 = { 85c0 7521 448b07 488b4b08 } // n = 4, score = 200 // 85c0 | mov ecx, dword ptr [ebp + 0x70] // 7521 | dec ecx // 448b07 | mov eax, dword ptr [ecx] // 488b4b08 | inc esp $sequence_7 = { 483305???????? 488bcb 488905???????? ff15???????? 488d15cd570100 483305???????? 488bcb } // n = 7, score = 200 // 483305???????? | // 488bcb | lea ecx, [ebp + 0xf] // 488905???????? | // ff15???????? | // 488d15cd570100 | dec eax // 483305???????? | // 488bcb | lea ecx, [ebp - 0x20] $sequence_8 = { 442bc3 4c8bcb 488bd3 488d8c2470010000 e8???????? 49891e 49897e08 } // n = 7, score = 200 // 442bc3 | nop // 4c8bcb | inc ebp // 488bd3 | test esi, esi // 488d8c2470010000 | je 0x805 // e8???????? | // 49891e | dec eax // 49897e08 | lea edx, [0x251ba] $sequence_9 = { 90 48837c247010 720a 488b4c2458 e8???????? 48c74424700f000000 4c897c2468 } // n = 7, score = 200 // 90 | mov ecx, dword ptr [ebp - 0x48] // 48837c247010 | test eax, eax // 720a | jne 0x698 // 488b4c2458 | inc edi // e8???????? | // 48c74424700f000000 | inc ebp // 4c897c2468 | xor eax, eax condition: 7 of them and filesize < 475136 }
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