Actor(s): APT-Q-12
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rule win_unidentified_100_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.unidentified_100." 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.unidentified_100" 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 = { 0fb64c2421 3bc1 0f8d11020000 0fb6442420 8d0485fcffffff 4898 b901000000 } // n = 7, score = 100 // 0fb64c2421 | mov byte ptr [edx + ecx], al // 3bc1 | jmp 0x379 // 0f8d11020000 | mov eax, 1 // 0fb6442420 | dec eax // 8d0485fcffffff | mov edx, dword ptr [esp + 0x20] // 4898 | mov byte ptr [edx + ecx], al // b901000000 | movzx eax, byte ptr [esp] $sequence_1 = { 4881ec78030000 488b05???????? 4833c4 4889842460030000 488d442440 488d0dcded0100 488bf8 } // n = 7, score = 100 // 4881ec78030000 | mov byte ptr [esp + 0x20], 0 // 488b05???????? | // 4833c4 | jmp 0x1dee // 4889842460030000 | movzx eax, byte ptr [esp + 0x20] // 488d442440 | dec eax // 488d0dcded0100 | lea edx, [esp + 0x30] // 488bf8 | dec eax $sequence_2 = { 0fb6542403 881401 0fb6442402 fec0 } // n = 4, score = 100 // 0fb6542403 | mov byte ptr [esp + 1], al // 881401 | movzx eax, byte ptr [esp + 1] // 0fb6442402 | movzx eax, byte ptr [esp + 1] // fec0 | dec al $sequence_3 = { 48c744242800000000 c744242000000000 4533c9 4533c0 488b9424a0030000 488b4c2440 ff15???????? } // n = 7, score = 100 // 48c744242800000000 | movzx eax, word ptr [esp + 0x20] // c744242000000000 | sub eax, 0x30 // 4533c9 | mov ecx, dword ptr [esp] // 4533c0 | imul ecx, eax // 488b9424a0030000 | mov eax, ecx // 488b4c2440 | jg 0x106d // ff15???????? | $sequence_4 = { 4c8d05eed70100 ba14000000 488d8c2430030000 e8???????? 488d842448030000 4889442428 } // n = 6, score = 100 // 4c8d05eed70100 | cmp eax, dword ptr [esp + 0x30] // ba14000000 | jae 0xdf4 // 488d8c2430030000 | inc eax // e8???????? | // 488d842448030000 | mov dword ptr [esp + 0x30], eax // 4889442428 | cmp dword ptr [esp + 0x30], 3 $sequence_5 = { e9???????? 498b8cf480850200 2bc3 8064f93dfd f7d8 1ac0 2402 } // n = 7, score = 100 // e9???????? | // 498b8cf480850200 | lea eax, [eax*4 - 3] // 2bc3 | dec eax // 8064f93dfd | cwde // f7d8 | mov ecx, 1 // 1ac0 | dec eax // 2402 | imul ecx, ecx, 1 $sequence_6 = { 488d1563290100 483950f0 740b 488b10 4885d2 } // n = 5, score = 100 // 488d1563290100 | mov word ptr [esp + 0x64], ax // 483950f0 | movzx eax, word ptr [esp + eax*2 + 0x530] // 740b | mov ecx, dword ptr [esp + 0x64] // 488b10 | mov edx, dword ptr [esp + 0x94] // 4885d2 | add ecx, edx $sequence_7 = { 488bd9 488d154f940000 b916000000 4c8d053b940000 e8???????? 488bcb 4885c0 } // n = 7, score = 100 // 488bd9 | lea eax, [esp + 0xac0] // 488d154f940000 | dec eax // b916000000 | lea edx, [esp + 0x380] // 4c8d053b940000 | dec eax // e8???????? | // 488bcb | mov ecx, dword ptr [esp + 0x48] // 4885c0 | dec eax $sequence_8 = { 488bc1 48c1f806 488d1566130100 83e13f } // n = 4, score = 100 // 488bc1 | dec eax // 48c1f806 | arpl cx, bx // 488d1566130100 | dec eax // 83e13f | lea ecx, [0x10e87] $sequence_9 = { c705????????090400c0 c705????????01000000 c705????????01000000 b808000000 486bc000 488d0d61110200 8b542430 } // n = 7, score = 100 // c705????????090400c0 | // c705????????01000000 | // c705????????01000000 | // b808000000 | mov dword ptr [esp + 0x5c], eax // 486bc000 | cmp dword ptr [esp + 0x5c], 0x32 // 488d0d61110200 | jge 0xe6d // 8b542430 | dec eax condition: 7 of them and filesize < 372736 }
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