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rule win_owlproxy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 488d9520060000 4c8d4c244c 4803d1 488d0d72ab0100 442bc6 } // n = 5, score = 200 // 488d9520060000 | mov dword ptr [ebp + 0x90], 0x18 // 4c8d4c244c | dec eax // 4803d1 | lea ecx, [ebp] // 488d0d72ab0100 | inc esp // 442bc6 | mov dword ptr [esp + 0x80], esi $sequence_1 = { 4c896c2450 4c896c2458 8bd6 488d4c2448 } // n = 4, score = 200 // 4c896c2450 | dec ecx // 4c896c2458 | add edi, 0x18 // 8bd6 | inc ecx // 488d4c2448 | inc esp $sequence_2 = { 488d0583160200 488903 488d4c2428 e8???????? 488b08 48894b10 488b4808 } // n = 7, score = 200 // 488d0583160200 | inc ebp // 488903 | xor esp, esp // 488d4c2428 | dec eax // e8???????? | // 488b08 | cwde // 48894b10 | dec eax // 488b4808 | test eax, eax $sequence_3 = { 4883ec20 488bd9 488d3d3c77feff 488bcf e8???????? 85c0 7422 } // n = 7, score = 200 // 4883ec20 | mov eax, 0xff // 488bd9 | dec eax // 488d3d3c77feff | mov ebx, ecx // 488bcf | dec eax // e8???????? | // 85c0 | cmp edx, eax // 7422 | ja 0x1fd3 $sequence_4 = { 488b5c2428 4885db 7442 488b7d87 483bdf 7431 0f1f440000 } // n = 7, score = 200 // 488b5c2428 | mov dword ptr [ecx + 0x10], edi // 4885db | dec ecx // 7442 | cmp dword ptr [eax + 0x18], 0x10 // 488b7d87 | jb 0x189d // 483bdf | dec ecx // 7431 | mov ecx, dword ptr [eax] // 0f1f440000 | dec esp $sequence_5 = { 488d15e7d60200 66443935???????? 7505 458bc6 eb0f 4983c8ff 49ffc0 } // n = 7, score = 200 // 488d15e7d60200 | mov dword ptr [esp + 8], ebx // 66443935???????? | // 7505 | push edi // 458bc6 | dec eax // eb0f | sub esp, 0x20 // 4983c8ff | dec eax // 49ffc0 | lea ebx, [0x18e23] $sequence_6 = { 4889742420 57 4883ec30 33c0 488bf2 488bd9 488901 } // n = 7, score = 200 // 4889742420 | inc esp // 57 | mov eax, dword ptr [esp + 0x28] // 4883ec30 | dec eax // 33c0 | mov edx, dword ptr [esp + 0x20] // 488bf2 | inc esp // 488bd9 | sub eax, edx // 488901 | dec esp $sequence_7 = { 4c8d05bbb30000 418d5216 e8???????? 85c0 0f8544090000 b805000000 884303 } // n = 7, score = 200 // 4c8d05bbb30000 | nop // 418d5216 | dec esp // e8???????? | // 85c0 | mov esi, dword ptr [ebp - 0x60] // 0f8544090000 | dec ebp // b805000000 | mov dword ptr [esi + 0x10], ebp // 884303 | dec eax $sequence_8 = { e8???????? 488b542438 488b4c2430 4c8b4c2428 4885c9 7412 c60100 } // n = 7, score = 200 // e8???????? | // 488b542438 | dec edx // 488b4c2430 | inc ecx // 4c8b4c2428 | or edx, 0xffffff00 // 4885c9 | inc ecx // 7412 | inc edx // c60100 | inc ebx $sequence_9 = { 4c2bc1 8bd3 4c2bc5 eb44 0fbe38 498bd6 498bde } // n = 7, score = 200 // 4c2bc1 | inc ecx // 8bd3 | cmp dword ptr [esi + 0x24], 4 // 4c2bc5 | jne 0x411 // eb44 | dec ecx // 0fbe38 | mov edx, dword ptr [esi + 0x38] // 498bd6 | dec eax // 498bde | mov dword ptr [esp + 0x60], 0xf condition: 7 of them and filesize < 475136 }
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