Actor(s): Lazarus Group
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rule win_vsingle_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 81f9ff000000 750f 8b5508 0355e8 c682b000000000 ebcd 8b4508 } // n = 7, score = 200 // 81f9ff000000 | cmp ecx, 0xff // 750f | jne 0x11 // 8b5508 | mov edx, dword ptr [ebp + 8] // 0355e8 | add edx, dword ptr [ebp - 0x18] // c682b000000000 | mov byte ptr [edx + 0xb0], 0 // ebcd | jmp 0xffffffcf // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_1 = { 8b4db4 83c101 894db4 eba9 8b55b4 8955a4 } // n = 6, score = 200 // 8b4db4 | mov ecx, dword ptr [ebp - 0x4c] // 83c101 | add ecx, 1 // 894db4 | mov dword ptr [ebp - 0x4c], ecx // eba9 | jmp 0xffffffab // 8b55b4 | mov edx, dword ptr [ebp - 0x4c] // 8955a4 | mov dword ptr [ebp - 0x5c], edx $sequence_2 = { 8945f8 8b45f8 8b4dfc 33cd e8???????? 8be5 } // n = 6, score = 200 // 8945f8 | mov dword ptr [ebp - 8], eax // 8b45f8 | mov eax, dword ptr [ebp - 8] // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 33cd | xor ecx, ebp // e8???????? | // 8be5 | mov esp, ebp $sequence_3 = { c68415acf7ffff00 8b8588f7ffff 038590f7ffff 898588f7ffff c78590f7ffff00000000 8d8dacf7ffff } // n = 6, score = 200 // c68415acf7ffff00 | mov byte ptr [ebp + edx - 0x854], 0 // 8b8588f7ffff | mov eax, dword ptr [ebp - 0x878] // 038590f7ffff | add eax, dword ptr [ebp - 0x870] // 898588f7ffff | mov dword ptr [ebp - 0x878], eax // c78590f7ffff00000000 | mov dword ptr [ebp - 0x870], 0 // 8d8dacf7ffff | lea ecx, [ebp - 0x854] $sequence_4 = { e8???????? 0330 56 8b4d08 } // n = 4, score = 200 // e8???????? | // 0330 | add esi, dword ptr [eax] // 56 | push esi // 8b4d08 | mov ecx, dword ptr [ebp + 8] $sequence_5 = { 33d0 8855fe 0fb64dfe 51 e8???????? 83c404 8845fe } // n = 7, score = 200 // 33d0 | xor edx, eax // 8855fe | mov byte ptr [ebp - 2], dl // 0fb64dfe | movzx ecx, byte ptr [ebp - 2] // 51 | push ecx // e8???????? | // 83c404 | add esp, 4 // 8845fe | mov byte ptr [ebp - 2], al $sequence_6 = { 6a00 8d85fdfbffff 50 e8???????? 83c40c 8b4d08 83c104 } // n = 7, score = 200 // 6a00 | push 0 // 8d85fdfbffff | lea eax, [ebp - 0x403] // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 83c104 | add ecx, 4 $sequence_7 = { 8d440a18 8945b4 b908000000 6bd100 } // n = 4, score = 200 // 8d440a18 | lea eax, [edx + ecx + 0x18] // 8945b4 | mov dword ptr [ebp - 0x4c], eax // b908000000 | mov ecx, 8 // 6bd100 | imul edx, ecx, 0 $sequence_8 = { 51 8b5510 039588f7ffff 52 6800080000 8d85acf7ffff } // n = 6, score = 200 // 51 | push ecx // 8b5510 | mov edx, dword ptr [ebp + 0x10] // 039588f7ffff | add edx, dword ptr [ebp - 0x878] // 52 | push edx // 6800080000 | push 0x800 // 8d85acf7ffff | lea eax, [ebp - 0x854] $sequence_9 = { 81bdecfeffff00a00f00 7318 8b95f0feffff 52 8d85f8feffff 50 e8???????? } // n = 7, score = 200 // 81bdecfeffff00a00f00 | cmp dword ptr [ebp - 0x114], 0xfa000 // 7318 | jae 0x1a // 8b95f0feffff | mov edx, dword ptr [ebp - 0x110] // 52 | push edx // 8d85f8feffff | lea eax, [ebp - 0x108] // 50 | push eax // e8???????? | condition: 7 of them and filesize < 940032 }
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