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rule win_owlproxy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 4833c4 4889842470020000 488bfa 4c8bf1 48894c2478 4533e4 4489a42498000000 } // n = 7, score = 200 // 4833c4 | dec esp // 4889842470020000 | mov eax, edi // 488bfa | dec eax // 4c8bf1 | lea eax, [edi + ebx] // 48894c2478 | dec eax // 4533e4 | mov edi, dword ptr [esp + 0x40] // 4489a42498000000 | dec eax $sequence_1 = { e8???????? 4881c420020000 415f 415e 5f } // n = 5, score = 200 // e8???????? | // 4881c420020000 | nop // 415f | mov dword ptr [esp + 0x20], 3 // 415e | dec eax // 5f | lea edx, [0x1584d] $sequence_2 = { 4885c0 7403 f0ff00 488d4128 41b806000000 488d15c8a50100 483950f0 } // n = 7, score = 200 // 4885c0 | dec eax // 7403 | lea eax, [0x20777] // f0ff00 | dec eax // 488d4128 | mov dword ptr [esp + 0x20], eax // 41b806000000 | dec eax // 488d15c8a50100 | lea edx, [esp + 0x20] // 483950f0 | dec eax $sequence_3 = { e8???????? 488b4527 48897d9f 48897da7 48837de700 742c 4c8bc8 } // n = 7, score = 200 // e8???????? | // 488b4527 | mov dword ptr [esp + 0x28], ebp // 48897d9f | dec eax // 48897da7 | mov dword ptr [esp + 0x20], ebp // 48837de700 | dec eax // 742c | lea ecx, [esp + 0x48] // 4c8bc8 | dec eax $sequence_4 = { 483bdf 756d 488bc7 482bc3 4883f801 7361 488bc6 } // n = 7, score = 200 // 483bdf | cmp ecx, eax // 756d | jne 0x2bd // 488bc7 | dec eax // 482bc3 | mov edx, ecx // 4883f801 | jne 0x2c1 // 7361 | dec eax // 488bc6 | lea ecx, [0x1ff02] $sequence_5 = { 482bc1 48ffc8 4883f801 730c 488d0d7c6d0200 e8???????? 492bc9 } // n = 7, score = 200 // 482bc1 | dec eax // 48ffc8 | mov ecx, eax // 4883f801 | inc ecx // 730c | call dword ptr [eax] // 488d0d7c6d0200 | inc eax // e8???????? | // 492bc9 | test bh, bh $sequence_6 = { 488d8a40000000 e9???????? 488d8a10010000 e9???????? 488d8a28000000 e9???????? } // n = 6, score = 200 // 488d8a40000000 | dec eax // e9???????? | // 488d8a10010000 | lea ecx, [0x10efb] // e9???????? | // 488d8a28000000 | dec eax // e9???????? | $sequence_7 = { 488d0d7ee30000 4c8bc7 e8???????? 488b03 66443920 0f8472010000 488b07 } // n = 7, score = 200 // 488d0d7ee30000 | inc ebp // 4c8bc7 | xor edi, edi // e8???????? | // 488b03 | inc esp // 66443920 | mov dword ptr [ebp - 0x59], edi // 0f8472010000 | dec eax // 488b07 | lea edi, [ecx + 8] $sequence_8 = { 488bfa 488bd9 896c2440 4885c0 7523 48c741180f000000 48896910 } // n = 7, score = 200 // 488bfa | mov edx, dword ptr [esp + 0x78] // 488bd9 | dec eax // 896c2440 | lea ecx, [esi + eax] // 4885c0 | dec esp // 7523 | sub eax, edx // 48c741180f000000 | dec eax // 48896910 | mov ecx, dword ptr [edi] $sequence_9 = { 480f42d1 488d4c2428 e8???????? 488b4c2430 4c8b4c2428 4a8d040f 4885c9 } // n = 7, score = 200 // 480f42d1 | sar eax, 5 // 488d4c2428 | and ecx, 0x1f // e8???????? | // 488b4c2430 | dec eax // 4c8b4c2428 | mov eax, dword ptr [edx + eax*8] // 4a8d040f | dec eax // 4885c9 | imul ecx, ecx, 0x58 condition: 7 of them and filesize < 475136 }
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