Actor(s): Longhorn
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rule win_lambert_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.lambert." 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.lambert" 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 = { 8945f4 837df400 751f 837d08ff 7519 } // n = 5, score = 400 // 8945f4 | mov dword ptr [ebp - 0xc], eax // 837df400 | cmp dword ptr [ebp - 0xc], 0 // 751f | jne 0x21 // 837d08ff | cmp dword ptr [ebp + 8], -1 // 7519 | jne 0x1b $sequence_1 = { 8955fc 8b45fc 8b08 83c930 } // n = 4, score = 400 // 8955fc | mov dword ptr [ebp - 4], edx // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b08 | mov ecx, dword ptr [eax] // 83c930 | or ecx, 0x30 $sequence_2 = { 334df0 83c220 314df8 894af0 894df4 8b4df8 } // n = 6, score = 400 // 334df0 | xor ecx, dword ptr [ebp - 0x10] // 83c220 | add edx, 0x20 // 314df8 | xor dword ptr [ebp - 8], ecx // 894af0 | mov dword ptr [edx - 0x10], ecx // 894df4 | mov dword ptr [ebp - 0xc], ecx // 8b4df8 | mov ecx, dword ptr [ebp - 8] $sequence_3 = { 8b5508 52 8b45f8 8b8870020000 ffd1 8945f4 837df400 } // n = 7, score = 400 // 8b5508 | mov edx, dword ptr [ebp + 8] // 52 | push edx // 8b45f8 | mov eax, dword ptr [ebp - 8] // 8b8870020000 | mov ecx, dword ptr [eax + 0x270] // ffd1 | call ecx // 8945f4 | mov dword ptr [ebp - 0xc], eax // 837df400 | cmp dword ptr [ebp - 0xc], 0 $sequence_4 = { 837d08ff 7519 837d0c22 7513 } // n = 4, score = 400 // 837d08ff | cmp dword ptr [ebp + 8], -1 // 7519 | jne 0x1b // 837d0c22 | cmp dword ptr [ebp + 0xc], 0x22 // 7513 | jne 0x15 $sequence_5 = { c1e810 0fb6f8 8972fc 895a08 8bcb } // n = 5, score = 400 // c1e810 | shr eax, 0x10 // 0fb6f8 | movzx edi, al // 8972fc | mov dword ptr [edx - 4], esi // 895a08 | mov dword ptr [edx + 8], ebx // 8bcb | mov ecx, ebx $sequence_6 = { 8bec 83ec0c e8???????? 58 8945f8 } // n = 5, score = 400 // 8bec | mov ebp, esp // 83ec0c | sub esp, 0xc // e8???????? | // 58 | pop eax // 8945f8 | mov dword ptr [ebp - 8], eax $sequence_7 = { 8b08 83c930 8b55fc 890a 8b45f4 8be5 } // n = 6, score = 400 // 8b08 | mov ecx, dword ptr [eax] // 83c930 | or ecx, 0x30 // 8b55fc | mov edx, dword ptr [ebp - 4] // 890a | mov dword ptr [edx], ecx // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 8be5 | mov esp, ebp $sequence_8 = { 8b45f8 2500f0ffff 8945f8 8b4d18 51 8b5514 } // n = 6, score = 400 // 8b45f8 | mov eax, dword ptr [ebp - 8] // 2500f0ffff | and eax, 0xfffff000 // 8945f8 | mov dword ptr [ebp - 8], eax // 8b4d18 | mov ecx, dword ptr [ebp + 0x18] // 51 | push ecx // 8b5514 | mov edx, dword ptr [ebp + 0x14] $sequence_9 = { 2bd9 8d4602 3bd8 0f82a4000000 83fe06 0f822cffffff } // n = 6, score = 400 // 2bd9 | sub ebx, ecx // 8d4602 | lea eax, [esi + 2] // 3bd8 | cmp ebx, eax // 0f82a4000000 | jb 0xaa // 83fe06 | cmp esi, 6 // 0f822cffffff | jb 0xffffff32 $sequence_10 = { 42 0fb702 c1e802 2bf8 42 } // n = 5, score = 400 // 42 | inc edx // 0fb702 | movzx eax, word ptr [edx] // c1e802 | shr eax, 2 // 2bf8 | sub edi, eax // 42 | inc edx $sequence_11 = { 40 e9???????? 8b4508 8b4804 334f04 53 } // n = 6, score = 400 // 40 | inc eax // e9???????? | // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b4804 | mov ecx, dword ptr [eax + 4] // 334f04 | xor ecx, dword ptr [edi + 4] // 53 | push ebx $sequence_12 = { 83f928 72da 84db 7418 } // n = 4, score = 400 // 83f928 | cmp ecx, 0x28 // 72da | jb 0xffffffdc // 84db | test bl, bl // 7418 | je 0x1a $sequence_13 = { 837d0c22 7513 8b5510 8955fc } // n = 4, score = 400 // 837d0c22 | cmp dword ptr [ebp + 0xc], 0x22 // 7513 | jne 0x15 // 8b5510 | mov edx, dword ptr [ebp + 0x10] // 8955fc | mov dword ptr [ebp - 4], edx $sequence_14 = { 0f8c1fffffff 8b07 8901 6a04 } // n = 4, score = 400 // 0f8c1fffffff | jl 0xffffff25 // 8b07 | mov eax, dword ptr [edi] // 8901 | mov dword ptr [ecx], eax // 6a04 | push 4 $sequence_15 = { 2bf8 4f 42 42 } // n = 4, score = 400 // 2bf8 | sub edi, eax // 4f | dec edi // 42 | inc edx // 42 | inc edx condition: 7 of them and filesize < 1212416 }
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