Actor(s): Lazarus Group
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rule win_vsingle_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.vsingle." 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.vsingle" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 035508 b801000000 6bc803 b804000000 6bc000 034508 be01000000 } // n = 7, score = 200 // 035508 | add edx, dword ptr [ebp + 8] // b801000000 | mov eax, 1 // 6bc803 | imul ecx, eax, 3 // b804000000 | mov eax, 4 // 6bc000 | imul eax, eax, 0 // 034508 | add eax, dword ptr [ebp + 8] // be01000000 | mov esi, 1 $sequence_1 = { 8955ec 8b45f4 8d0c85f0ffffff 894df0 8b5508 0355f0 0fb602 } // n = 7, score = 200 // 8955ec | mov dword ptr [ebp - 0x14], edx // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 8d0c85f0ffffff | lea ecx, [eax*4 - 0x10] // 894df0 | mov dword ptr [ebp - 0x10], ecx // 8b5508 | mov edx, dword ptr [ebp + 8] // 0355f0 | add edx, dword ptr [ebp - 0x10] // 0fb602 | movzx eax, byte ptr [edx] $sequence_2 = { 034dfc 8b550c 8a0402 884101 b901000000 6bd118 8b4508 } // n = 7, score = 200 // 034dfc | add ecx, dword ptr [ebp - 4] // 8b550c | mov edx, dword ptr [ebp + 0xc] // 8a0402 | mov al, byte ptr [edx + eax] // 884101 | mov byte ptr [ecx + 1], al // b901000000 | mov ecx, 1 // 6bd118 | imul edx, ecx, 0x18 // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_3 = { 8955a4 837da440 7302 eb05 e8???????? 8b45a4 } // n = 6, score = 200 // 8955a4 | mov dword ptr [ebp - 0x5c], edx // 837da440 | cmp dword ptr [ebp - 0x5c], 0x40 // 7302 | jae 4 // eb05 | jmp 7 // e8???????? | // 8b45a4 | mov eax, dword ptr [ebp - 0x5c] $sequence_4 = { b810000000 668945f8 c745f4f756bd64 eb20 b932000000 66894dee c745f080f00400 } // n = 7, score = 200 // b810000000 | mov eax, 0x10 // 668945f8 | mov word ptr [ebp - 8], ax // c745f4f756bd64 | mov dword ptr [ebp - 0xc], 0x64bd56f7 // eb20 | jmp 0x22 // b932000000 | mov ecx, 0x32 // 66894dee | mov word ptr [ebp - 0x12], cx // c745f080f00400 | mov dword ptr [ebp - 0x10], 0x4f080 $sequence_5 = { 8b55fc 83c201 8955fc ebce b801000000 6bc809 } // n = 6, score = 200 // 8b55fc | mov edx, dword ptr [ebp - 4] // 83c201 | add edx, 1 // 8955fc | mov dword ptr [ebp - 4], edx // ebce | jmp 0xffffffd0 // b801000000 | mov eax, 1 // 6bc809 | imul ecx, eax, 9 $sequence_6 = { 35ff000000 8b4d08 034dfc 8801 } // n = 4, score = 200 // 35ff000000 | xor eax, 0xff // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 034dfc | add ecx, dword ptr [ebp - 4] // 8801 | mov byte ptr [ecx], al $sequence_7 = { 0fb675fd 33ce 0fb61402 33d1 b801000000 d1e0 } // n = 6, score = 200 // 0fb675fd | movzx esi, byte ptr [ebp - 3] // 33ce | xor ecx, esi // 0fb61402 | movzx edx, byte ptr [edx + eax] // 33d1 | xor edx, ecx // b801000000 | mov eax, 1 // d1e0 | shl eax, 1 $sequence_8 = { 50 ff15???????? c645e800 33c9 894de9 894ded 894df1 } // n = 7, score = 200 // 50 | push eax // ff15???????? | // c645e800 | mov byte ptr [ebp - 0x18], 0 // 33c9 | xor ecx, ecx // 894de9 | mov dword ptr [ebp - 0x17], ecx // 894ded | mov dword ptr [ebp - 0x13], ecx // 894df1 | mov dword ptr [ebp - 0xf], ecx $sequence_9 = { c645d2e0 c645d34f c645d4d0 c645d520 c645d6ea c645d73a c645d869 } // n = 7, score = 200 // c645d2e0 | mov byte ptr [ebp - 0x2e], 0xe0 // c645d34f | mov byte ptr [ebp - 0x2d], 0x4f // c645d4d0 | mov byte ptr [ebp - 0x2c], 0xd0 // c645d520 | mov byte ptr [ebp - 0x2b], 0x20 // c645d6ea | mov byte ptr [ebp - 0x2a], 0xea // c645d73a | mov byte ptr [ebp - 0x29], 0x3a // c645d869 | mov byte ptr [ebp - 0x28], 0x69 condition: 7 of them and filesize < 940032 }
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