Actor(s): Longhorn
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rule win_lambert_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 8b5510 8955fc 8b45fc 8b08 83c930 } // n = 5, 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 $sequence_1 = { 2500f0ffff 8945f8 8b4d18 51 8b5514 52 } // n = 6, 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 $sequence_2 = { 750f 8b55fc 8b45f8 0fb70c50 894df0 eb02 ebb8 } // n = 7, score = 300 // 750f | jne 0x11 // 8b55fc | mov edx, dword ptr [ebp - 4] // 8b45f8 | mov eax, dword ptr [ebp - 8] // 0fb70c50 | movzx ecx, word ptr [eax + edx*2] // 894df0 | mov dword ptr [ebp - 0x10], ecx // eb02 | jmp 4 // ebb8 | jmp 0xffffffba $sequence_3 = { 8b4d0c 51 8b5508 52 8b45f8 8b8870020000 } // n = 6, score = 300 // 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_4 = { 7516 8b487c 894c240c 85c9 } // n = 4, score = 300 // 7516 | jne 0x18 // 8b487c | mov ecx, dword ptr [eax + 0x7c] // 894c240c | mov dword ptr [esp + 0xc], ecx // 85c9 | test ecx, ecx $sequence_5 = { 8801 41 47 8a07 8801 41 47 } // n = 7, score = 300 // 8801 | mov byte ptr [ecx], al // 41 | inc ecx // 47 | inc edi // 8a07 | mov al, byte ptr [edi] // 8801 | mov byte ptr [ecx], al // 41 | inc ecx // 47 | inc edi $sequence_6 = { 8b4dec 8b5508 031481 8955f4 } // n = 4, score = 300 // 8b4dec | mov ecx, dword ptr [ebp - 0x14] // 8b5508 | mov edx, dword ptr [ebp + 8] // 031481 | add edx, dword ptr [ecx + eax*4] // 8955f4 | mov dword ptr [ebp - 0xc], edx $sequence_7 = { 8a500b 32530b 88510b 8a500c } // n = 4, score = 300 // 8a500b | mov dl, byte ptr [eax + 0xb] // 32530b | xor dl, byte ptr [ebx + 0xb] // 88510b | mov byte ptr [ecx + 0xb], dl // 8a500c | mov dl, byte ptr [eax + 0xc] $sequence_8 = { 894c240c 85c9 740b 8b4078 03c5 89442414 } // n = 6, score = 300 // 894c240c | mov dword ptr [esp + 0xc], ecx // 85c9 | test ecx, ecx // 740b | je 0xd // 8b4078 | mov eax, dword ptr [eax + 0x78] // 03c5 | add eax, ebp // 89442414 | mov dword ptr [esp + 0x14], eax $sequence_9 = { 7413 8b8c240c020000 51 ffd0 81c408020000 } // n = 5, score = 300 // 7413 | je 0x15 // 8b8c240c020000 | mov ecx, dword ptr [esp + 0x20c] // 51 | push ecx // ffd0 | call eax // 81c408020000 | add esp, 0x208 $sequence_10 = { eb60 8b45fc 83c078 8945f0 } // n = 4, score = 300 // eb60 | jmp 0x62 // 8b45fc | mov eax, dword ptr [ebp - 4] // 83c078 | add eax, 0x78 // 8945f0 | mov dword ptr [ebp - 0x10], eax $sequence_11 = { 3b4df8 7502 eb0b 8b55fc 83c201 8955fc ebb9 } // n = 7, score = 300 // 3b4df8 | cmp ecx, dword ptr [ebp - 8] // 7502 | jne 4 // eb0b | jmp 0xd // 8b55fc | mov edx, dword ptr [ebp - 4] // 83c201 | add edx, 1 // 8955fc | mov dword ptr [ebp - 4], edx // ebb9 | jmp 0xffffffbb $sequence_12 = { 75ee 894d6c 837d7000 0f8546feffff 8b457c } // n = 5, score = 300 // 75ee | jne 0xfffffff0 // 894d6c | mov dword ptr [ebp + 0x6c], ecx // 837d7000 | cmp dword ptr [ebp + 0x70], 0 // 0f8546feffff | jne 0xfffffe4c // 8b457c | mov eax, dword ptr [ebp + 0x7c] $sequence_13 = { 7519 837d0c22 7513 8b5510 8955fc } // n = 5, score = 300 // 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_14 = { 0fb74508 83f841 7c12 0fb74d08 } // n = 4, score = 300 // 0fb74508 | movzx eax, word ptr [ebp + 8] // 83f841 | cmp eax, 0x41 // 7c12 | jl 0x14 // 0fb74d08 | movzx ecx, word ptr [ebp + 8] $sequence_15 = { 035124 8955f8 c745fc00000000 eb09 8b45fc 83c001 } // n = 6, score = 300 // 035124 | add edx, dword ptr [ecx + 0x24] // 8955f8 | mov dword ptr [ebp - 8], edx // c745fc00000000 | mov dword ptr [ebp - 4], 0 // eb09 | jmp 0xb // 8b45fc | mov eax, dword ptr [ebp - 4] // 83c001 | add eax, 1 $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 = { c3 55 8d6c24a0 81ec94000000 8b457c 53 0fb698f2000000 } // n = 7, score = 300 // c3 | ret // 55 | push ebp // 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] $sequence_18 = { 52 8b45f8 8b8870020000 ffd1 8945f4 837df400 751f } // n = 7, score = 300 // 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 // 751f | jne 0x21 $sequence_19 = { 8b45fc 8945f4 8b4df4 8b55f4 } // n = 4, score = 300 // 8b45fc | mov eax, dword ptr [ebp - 4] // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 8b55f4 | mov edx, dword ptr [ebp - 0xc] $sequence_20 = { f7d2 8b45f4 335004 8955f8 8b4df4 8b5108 } // n = 6, score = 300 // f7d2 | not edx // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 335004 | xor edx, dword ptr [eax + 4] // 8955f8 | mov dword ptr [ebp - 8], edx // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 8b5108 | mov edx, dword ptr [ecx + 8] $sequence_21 = { 55 8bec 83ec0c e8???????? 58 } // n = 5, score = 300 // 55 | push ebp // 8bec | mov ebp, esp // 83ec0c | sub esp, 0xc // e8???????? | // 58 | pop eax $sequence_22 = { 8945f4 837df400 751f 837d08ff 7519 837d0c22 } // n = 6, score = 300 // 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 // 837d0c22 | cmp dword ptr [ebp + 0xc], 0x22 $sequence_23 = { 663b4500 7523 8b453c 03c5 813850450000 } // n = 5, score = 300 // 663b4500 | cmp ax, word ptr [ebp] // 7523 | jne 0x25 // 8b453c | mov eax, dword ptr [ebp + 0x3c] // 03c5 | add eax, ebp // 813850450000 | cmp dword ptr [eax], 0x4550 condition: 7 of them and filesize < 1212416 }
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