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rule win_mount_locker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 498be8 4d8bc8 4c8bc2 4c8bf2 8bf1 } // n = 5, score = 500 // 498be8 | dec eax // 4d8bc8 | sub esp, 0x28 // 4c8bc2 | je 0x530 // 4c8bf2 | dec eax // 8bf1 | lea ecx, [0xa40] $sequence_1 = { 488b4c2458 33d2 c744243001000000 c744243c02000000 } // n = 4, score = 500 // 488b4c2458 | dec eax // 33d2 | and dword ptr [esp + 0x20], 0 // c744243001000000 | test eax, eax // c744243c02000000 | je 0x216 $sequence_2 = { 488364242000 4533c9 488b4c2458 33d2 c744243001000000 c744243c02000000 } // n = 6, score = 500 // 488364242000 | mov ebx, 1 // 4533c9 | dec esp // 488b4c2458 | lea eax, [esp + 0x30] // 33d2 | mov edx, ebx // c744243001000000 | or ecx, 0xfffffffc // c744243c02000000 | add ecx, ebx $sequence_3 = { 488bcb 488b15???????? e8???????? 85c0 } // n = 4, score = 500 // 488bcb | dec eax // 488b15???????? | // e8???????? | // 85c0 | lea edx, [0x14209] $sequence_4 = { 488364242800 4c8d442430 488364242000 4533c9 488b4c2458 33d2 c744243001000000 } // n = 7, score = 500 // 488364242800 | lea ecx, [esp + 0x20] // 4c8d442430 | dec eax // 488364242000 | mov edi, eax // 4533c9 | dec eax // 488b4c2458 | test eax, eax // 33d2 | je 0x18bd // c744243001000000 | dec eax $sequence_5 = { f30f5905???????? 0f5ad0 66490f7ed0 e8???????? } // n = 4, score = 500 // f30f5905???????? | // 0f5ad0 | jne 0x7e8 // 66490f7ed0 | dec eax // e8???????? | $sequence_6 = { 4c8bc2 4c8bf2 8bf1 33d2 } // n = 4, score = 500 // 4c8bc2 | xor edx, edx // 4c8bf2 | dec eax // 8bf1 | lea ecx, [0xd512] // 33d2 | dec eax $sequence_7 = { 4d8bc8 4c8bc2 4c8bf2 8bf1 33d2 33c9 } // n = 6, score = 500 // 4d8bc8 | push esi // 4c8bc2 | inc ecx // 4c8bf2 | push edi // 8bf1 | dec eax // 33d2 | sub esp, 0x20 // 33c9 | dec ebp $sequence_8 = { 4533c9 488b4c2458 33d2 c744243001000000 } // n = 4, score = 500 // 4533c9 | lea edx, [edi + 2] // 488b4c2458 | inc esp // 33d2 | lea ecx, [eax*2 + 0x18] // c744243001000000 | mov esi, eax $sequence_9 = { 488b0b 41b902000000 4533c0 33d2 } // n = 4, score = 500 // 488b0b | inc esp // 41b902000000 | mov esi, ecx // 4533c0 | dec eax // 33d2 | lea edx, [esp + 0x20] condition: 7 of them and filesize < 368640 }
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