Actor(s): Longhorn
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rule win_lambert_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2021-10-07" 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 = "20211007" malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535" malpedia_version = "20211008" 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 = { 8955fc 8b45fc 8b08 83c930 8b55fc } // n = 5, score = 300 // 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] $sequence_1 = { 7513 8b5510 8955fc 8b45fc } // n = 4, score = 300 // 7513 | jne 0x15 // 8b5510 | mov edx, dword ptr [ebp + 0x10] // 8955fc | mov dword ptr [ebp - 4], edx // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_2 = { 325309 885109 8a500a 32530a 88510a 8a500b 32530b } // n = 7, score = 300 // 325309 | xor dl, byte ptr [ebx + 9] // 885109 | mov byte ptr [ecx + 9], dl // 8a500a | mov dl, byte ptr [eax + 0xa] // 32530a | xor dl, byte ptr [ebx + 0xa] // 88510a | mov byte ptr [ecx + 0xa], dl // 8a500b | mov dl, byte ptr [eax + 0xb] // 32530b | xor dl, byte ptr [ebx + 0xb] $sequence_3 = { 3bf1 0f87a2000000 53 57 8d7c2410 33db 33d2 } // n = 7, score = 300 // 3bf1 | cmp esi, ecx // 0f87a2000000 | ja 0xa8 // 53 | push ebx // 57 | push edi // 8d7c2410 | lea edi, dword ptr [esp + 0x10] // 33db | xor ebx, ebx // 33d2 | xor edx, edx $sequence_4 = { 0f83b5000000 2bd9 8d4602 3bd8 0f82a4000000 83fe06 } // n = 6, score = 300 // 0f83b5000000 | jae 0xbb // 2bd9 | sub ebx, ecx // 8d4602 | lea eax, dword ptr [esi + 2] // 3bd8 | cmp ebx, eax // 0f82a4000000 | jb 0xaa // 83fe06 | cmp esi, 6 $sequence_5 = { 7519 837d0c22 7513 8b5510 } // n = 4, score = 300 // 7519 | jne 0x1b // 837d0c22 | cmp dword ptr [ebp + 0xc], 0x22 // 7513 | jne 0x15 // 8b5510 | mov edx, dword ptr [ebp + 0x10] $sequence_6 = { 325306 885106 8a5007 325307 885107 8a5008 } // n = 6, score = 300 // 325306 | xor dl, byte ptr [ebx + 6] // 885106 | mov byte ptr [ecx + 6], dl // 8a5007 | mov dl, byte ptr [eax + 7] // 325307 | xor dl, byte ptr [ebx + 7] // 885107 | mov byte ptr [ecx + 7], dl // 8a5008 | mov dl, byte ptr [eax + 8] $sequence_7 = { 0fb6d2 88840d00fdffff 88840dfffdffff 888c0500ffffff } // n = 4, score = 300 // 0fb6d2 | movzx edx, dl // 88840d00fdffff | mov byte ptr [ebp + ecx - 0x300], al // 88840dfffdffff | mov byte ptr [ebp + ecx - 0x201], al // 888c0500ffffff | mov byte ptr [ebp + eax - 0x100], cl $sequence_8 = { 325307 885107 8a5008 325308 885108 8a5009 } // n = 6, score = 300 // 325307 | xor dl, byte ptr [ebx + 7] // 885107 | mov byte ptr [ecx + 7], dl // 8a5008 | mov dl, byte ptr [eax + 8] // 325308 | xor dl, byte ptr [ebx + 8] // 885108 | mov byte ptr [ecx + 8], dl // 8a5009 | mov dl, byte ptr [eax + 9] $sequence_9 = { 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_10 = { 8b45f8 8b8870020000 ffd1 8945f4 837df400 } // n = 5, score = 300 // 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_11 = { 325308 885108 8a5009 325309 885109 8a500a } // n = 6, score = 300 // 325308 | xor dl, byte ptr [ebx + 8] // 885108 | mov byte ptr [ecx + 8], dl // 8a5009 | mov dl, byte ptr [eax + 9] // 325309 | xor dl, byte ptr [ebx + 9] // 885109 | mov byte ptr [ecx + 9], dl // 8a500a | mov dl, byte ptr [eax + 0xa] $sequence_12 = { 51 8b5508 52 8b45f8 8b8870020000 } // n = 5, score = 300 // 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_13 = { 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_14 = { 325305 885105 8a5006 325306 885106 8a5007 } // n = 6, score = 300 // 325305 | xor dl, byte ptr [ebx + 5] // 885105 | mov byte ptr [ecx + 5], dl // 8a5006 | mov dl, byte ptr [eax + 6] // 325306 | xor dl, byte ptr [ebx + 6] // 885106 | mov byte ptr [ecx + 6], dl // 8a5007 | mov dl, byte ptr [eax + 7] $sequence_15 = { e8???????? 58 8945f8 8b45f8 2500f0ffff 8945f8 } // n = 6, 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 condition: 7 of them and filesize < 1212416 }
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