Actor(s): Longhorn
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rule win_lambert_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-05-30" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.4.0" tool_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.lambert" malpedia_rule_date = "20200529" malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8" malpedia_version = "20200529" 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 / approach 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 = { 0f85e0feffff eb09 8b45e0 8b4ddc 8b55d8 8b75e4 } // n = 6, score = 300 // 0f85e0feffff | jne 0xfffffee6 // eb09 | jmp 0xb // 8b45e0 | mov eax, dword ptr [ebp - 0x20] // 8b4ddc | mov ecx, dword ptr [ebp - 0x24] // 8b55d8 | mov edx, dword ptr [ebp - 0x28] // 8b75e4 | mov esi, dword ptr [ebp - 0x1c] $sequence_1 = { c1e213 0bca 894df8 8b45fc } // n = 4, score = 300 // c1e213 | shl edx, 0x13 // 0bca | or ecx, edx // 894df8 | mov dword ptr [ebp - 8], ecx // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_2 = { 03f8 3bf0 73f2 85f6 0f866afeffff } // n = 5, score = 300 // 03f8 | add edi, eax // 3bf0 | cmp esi, eax // 73f2 | jae 0xfffffff4 // 85f6 | test esi, esi // 0f866afeffff | jbe 0xfffffe70 $sequence_3 = { 8d6c24a0 81ec94000000 8b457c 53 0fb698f2000000 56 } // n = 6, score = 300 // 8d6c24a0 | lea ebp, [esp - 0x60] // 81ec94000000 | sub esp, 0x94 // 8b457c | mov eax, dword ptr [ebp + 0x7c] // 53 | push ebx // 0fb698f2000000 | movzx ebx, byte ptr [eax + 0xf2] // 56 | push esi $sequence_4 = { 0fb74508 83f841 7c12 0fb74d08 83f95a 7f09 0fb74508 } // n = 7, score = 300 // 0fb74508 | movzx eax, word ptr [ebp + 8] // 83f841 | cmp eax, 0x41 // 7c12 | jl 0x14 // 0fb74d08 | movzx ecx, word ptr [ebp + 8] // 83f95a | cmp ecx, 0x5a // 7f09 | jg 0xb // 0fb74508 | movzx eax, word ptr [ebp + 8] $sequence_5 = { 837d08ff 7519 837d0c22 7513 8b5510 8955fc } // n = 6, score = 300 // 837d08ff | cmp dword ptr [ebp + 8], -1 // 7519 | jne 0x1b // 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_6 = { 8d8dfffdffff 2bc8 0fb609 eb02 33c9 8d0409 33c1 } // n = 7, score = 300 // 8d8dfffdffff | lea ecx, [ebp - 0x201] // 2bc8 | sub ecx, eax // 0fb609 | movzx ecx, byte ptr [ecx] // eb02 | jmp 4 // 33c9 | xor ecx, ecx // 8d0409 | lea eax, [ecx + ecx] // 33c1 | xor eax, ecx $sequence_7 = { 8b5510 8955fc 8b45fc 8b08 83c930 8b55fc 890a } // n = 7, score = 300 // 8b5510 | mov edx, dword ptr [ebp + 0x10] // 8955fc | mov dword ptr [ebp - 4], edx // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b08 | mov ecx, dword ptr [eax] // 83c930 | or ecx, 0x30 // 8b55fc | mov edx, dword ptr [ebp - 4] // 890a | mov dword ptr [edx], ecx $sequence_8 = { 8b421c 8945f4 8b4df4 894df0 8b55f4 8b4220 50 } // n = 7, score = 300 // 8b421c | mov eax, dword ptr [edx + 0x1c] // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 894df0 | mov dword ptr [ebp - 0x10], ecx // 8b55f4 | mov edx, dword ptr [ebp - 0xc] // 8b4220 | mov eax, dword ptr [edx + 0x20] // 50 | push eax $sequence_9 = { 4f 42 3b7d10 724d 3bf9 7349 8bc3 } // n = 7, score = 300 // 4f | dec edi // 42 | inc edx // 3b7d10 | cmp edi, dword ptr [ebp + 0x10] // 724d | jb 0x4f // 3bf9 | cmp edi, ecx // 7349 | jae 0x4b // 8bc3 | mov eax, ebx $sequence_10 = { 8b4508 50 e8???????? 8945f4 8b4de8 8b55f4 3b5114 } // n = 7, score = 300 // 8b4508 | mov eax, dword ptr [ebp + 8] // 50 | push eax // e8???????? | // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8b4de8 | mov ecx, dword ptr [ebp - 0x18] // 8b55f4 | mov edx, dword ptr [ebp - 0xc] // 3b5114 | cmp edx, dword ptr [ecx + 0x14] $sequence_11 = { 8b55fc 890a 8b45f4 8be5 } // n = 4, score = 300 // 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_12 = { 64a130000000 8945fc 8b4dfc 8b510c 8b421c } // n = 5, score = 300 // 64a130000000 | mov eax, dword ptr fs:[0x30] // 8945fc | mov dword ptr [ebp - 4], eax // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 8b510c | mov edx, dword ptr [ecx + 0xc] // 8b421c | mov eax, dword ptr [edx + 0x1c] $sequence_13 = { 7502 eb0b 8b55fc 83c201 8955fc } // n = 5, score = 300 // 7502 | jne 4 // eb0b | jmp 0xd // 8b55fc | mov edx, dword ptr [ebp - 4] // 83c201 | add edx, 1 // 8955fc | mov dword ptr [ebp - 4], edx $sequence_14 = { 8bec 83ec0c e8???????? 58 } // n = 4, score = 300 // 8bec | mov ebp, esp // 83ec0c | sub esp, 0xc // e8???????? | // 58 | pop eax $sequence_15 = { 48 895de8 894df0 8975f4 0f8427010000 8945f8 eb06 } // n = 7, score = 300 // 48 | dec eax // 895de8 | mov dword ptr [ebp - 0x18], ebx // 894df0 | mov dword ptr [ebp - 0x10], ecx // 8975f4 | mov dword ptr [ebp - 0xc], esi // 0f8427010000 | je 0x12d // 8945f8 | mov dword ptr [ebp - 8], eax // eb06 | jmp 8 $sequence_16 = { e8???????? 58 8945f8 8b45f8 2500f0ffff 8945f8 8b4d18 } // n = 7, score = 300 // e8???????? | // 58 | pop eax // 8945f8 | mov dword ptr [ebp - 8], eax // 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] $sequence_17 = { 2500f0ffff 8945f8 8b4d18 51 8b5514 52 8b4510 } // n = 7, score = 300 // 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] // 52 | push edx // 8b4510 | mov eax, dword ptr [ebp + 0x10] $sequence_18 = { e8???????? 0fb7d0 0355f8 8955f8 ebc5 8b45f8 } // n = 6, score = 300 // e8???????? | // 0fb7d0 | movzx edx, ax // 0355f8 | add edx, dword ptr [ebp - 8] // 8955f8 | mov dword ptr [ebp - 8], edx // ebc5 | jmp 0xffffffc7 // 8b45f8 | mov eax, dword ptr [ebp - 8] $sequence_19 = { 89580c 8b5110 895010 8955f0 8b5114 895014 } // n = 6, score = 300 // 89580c | mov dword ptr [eax + 0xc], ebx // 8b5110 | mov edx, dword ptr [ecx + 0x10] // 895010 | mov dword ptr [eax + 0x10], edx // 8955f0 | mov dword ptr [ebp - 0x10], edx // 8b5114 | mov edx, dword ptr [ecx + 0x14] // 895014 | mov dword ptr [eax + 0x14], edx $sequence_20 = { 8b8c2410020000 52 51 ffd0 } // n = 4, score = 300 // 8b8c2410020000 | mov ecx, dword ptr [esp + 0x210] // 52 | push edx // 51 | push ecx // ffd0 | call eax $sequence_21 = { 7428 8b4df8 c1e90d 8b55f8 c1e213 } // n = 5, score = 300 // 7428 | je 0x2a // 8b4df8 | mov ecx, dword ptr [ebp - 8] // c1e90d | shr ecx, 0xd // 8b55f8 | mov edx, dword ptr [ebp - 8] // c1e213 | shl edx, 0x13 $sequence_22 = { 50 8b4d0c 51 8b5508 52 8b45f8 8b8870020000 } // n = 7, score = 300 // 50 | push eax // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 51 | push ecx // 8b5508 | mov edx, dword ptr [ebp + 8] // 52 | push edx // 8b45f8 | mov eax, dword ptr [ebp - 8] // 8b8870020000 | mov ecx, dword ptr [eax + 0x270] $sequence_23 = { ffd1 8945f4 837df400 751f 837d08ff } // n = 5, score = 300 // ffd1 | call ecx // 8945f4 | mov dword ptr [ebp - 0xc], eax // 837df400 | cmp dword ptr [ebp - 0xc], 0 // 751f | jne 0x21 // 837d08ff | cmp dword ptr [ebp + 8], -1 condition: 7 of them and filesize < 1212416 }
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