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rule win_mount_locker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.mount_locker." 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.mount_locker" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 488bc8 ff15???????? 85c0 7456 } // n = 4, score = 300 // 488bc8 | dec eax // ff15???????? | // 85c0 | lea edx, dword ptr [0x6657] // 7456 | mov ecx, 3 $sequence_1 = { 488d45c0 4533c9 4889442448 488d95f0010000 488d442450 4533c0 } // n = 6, score = 300 // 488d45c0 | lea edx, dword ptr [0x6405] // 4533c9 | inc ecx // 4889442448 | mov ecx, edi // 488d95f0010000 | dec eax // 488d442450 | lea edx, dword ptr [0x368a] // 4533c0 | inc esp $sequence_2 = { 498be3 5d c3 bb68000000 488d4c2450 448bc3 33d2 } // n = 7, score = 300 // 498be3 | dec eax // 5d | lea eax, dword ptr [ebp - 0x40] // c3 | dec esp // bb68000000 | mov dword ptr [esp + 0x38], esi // 488d4c2450 | dec esp // 448bc3 | lea eax, dword ptr [0x5f3d] // 33d2 | dec eax $sequence_3 = { 4889442420 ff15???????? 488b4d6f 8bd8 ff15???????? 488b4d77 33d2 } // n = 7, score = 300 // 4889442420 | mov edx, 0xc0000000 // ff15???????? | // 488b4d6f | mov dword ptr [esp + 0x20], 2 // 8bd8 | dec eax // ff15???????? | // 488b4d77 | mov ecx, ebx // 33d2 | dec eax $sequence_4 = { 751e 488b0d???????? 488d542420 ff15???????? 8b442424 8905???????? eb0d } // n = 7, score = 300 // 751e | dec eax // 488b0d???????? | // 488d542420 | sub esp, 0x130 // ff15???????? | // 8b442424 | dec eax // 8905???????? | // eb0d | mov esi, ecx $sequence_5 = { 4533c9 488b4c2458 33d2 c744243001000000 c744243c02000000 } // n = 5, score = 300 // 4533c9 | mov ebx, eax // 488b4c2458 | xorps xmm0, xmm0 // 33d2 | dec eax // c744243001000000 | mov eax, 0x1a9fbe77 // c744243c02000000 | das $sequence_6 = { 33d2 4889442420 ff15???????? 488b4d6f 8bd8 } // n = 5, score = 300 // 33d2 | lea ecx, dword ptr [esp + 0x50] // 4889442420 | inc esp // ff15???????? | // 488b4d6f | mov eax, ebx // 8bd8 | xor edx, edx $sequence_7 = { 488d542420 ff15???????? 8b442424 8905???????? eb0d } // n = 5, score = 300 // 488d542420 | jne 0x11ed // ff15???????? | // 8b442424 | dec eax // 8905???????? | // eb0d | test edi, edi $sequence_8 = { 33d2 4889442420 ff15???????? 488b4d6f 8bd8 ff15???????? 488b4d77 } // n = 7, score = 300 // 33d2 | inc ecx // 4889442420 | mov eax, dword ptr [esp + 0x18] // ff15???????? | // 488b4d6f | dec eax // 8bd8 | lea esi, dword ptr [ebx + 0x238] // ff15???????? | // 488b4d77 | dec eax $sequence_9 = { 743b 488b4d6f 488d4567 c744243000010000 4533c9 } // n = 5, score = 300 // 743b | dec eax // 488b4d6f | mov dword ptr [ebx], eax // 488d4567 | dec eax // c744243000010000 | test edx, edx // 4533c9 | je 0x14ab condition: 7 of them and filesize < 225280 }
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