Actor(s): Lazarus Group
There is no description at this point.
rule win_unidentified_042_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.unidentified_042." 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.unidentified_042" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { d1c6 8975a8 8b75fc 33f3 3375f0 8b5df0 0375a8 } // n = 7, score = 100 // d1c6 | rol esi, 1 // 8975a8 | mov dword ptr [ebp - 0x58], esi // 8b75fc | mov esi, dword ptr [ebp - 4] // 33f3 | xor esi, ebx // 3375f0 | xor esi, dword ptr [ebp - 0x10] // 8b5df0 | mov ebx, dword ptr [ebp - 0x10] // 0375a8 | add esi, dword ptr [ebp - 0x58] $sequence_1 = { 0f8d85000000 8d55c4 52 8bc2 50 e8???????? } // n = 6, score = 100 // 0f8d85000000 | jge 0x8b // 8d55c4 | lea edx, [ebp - 0x3c] // 52 | push edx // 8bc2 | mov eax, edx // 50 | push eax // e8???????? | $sequence_2 = { 6a02 8d5e1c 50 8b8774020000 8bf3 e8???????? } // n = 6, score = 100 // 6a02 | push 2 // 8d5e1c | lea ebx, [esi + 0x1c] // 50 | push eax // 8b8774020000 | mov eax, dword ptr [edi + 0x274] // 8bf3 | mov esi, ebx // e8???????? | $sequence_3 = { 8bc1 52 0fb655ff c1e80a 83e001 50 0fb7837e010000 } // n = 7, score = 100 // 8bc1 | mov eax, ecx // 52 | push edx // 0fb655ff | movzx edx, byte ptr [ebp - 1] // c1e80a | shr eax, 0xa // 83e001 | and eax, 1 // 50 | push eax // 0fb7837e010000 | movzx eax, word ptr [ebx + 0x17e] $sequence_4 = { c78524ffffff3fd27290 c78528ffffffae4e840c c7852cffffff79ca6988 c78530ffffff90060984 c78534fffffffa024380 c78538ffffff893ec3fc c7853cffffff05ba3078 } // n = 7, score = 100 // c78524ffffff3fd27290 | mov dword ptr [ebp - 0xdc], 0x9072d23f // c78528ffffffae4e840c | mov dword ptr [ebp - 0xd8], 0xc844eae // c7852cffffff79ca6988 | mov dword ptr [ebp - 0xd4], 0x8869ca79 // c78530ffffff90060984 | mov dword ptr [ebp - 0xd0], 0x84090690 // c78534fffffffa024380 | mov dword ptr [ebp - 0xcc], 0x804302fa // c78538ffffff893ec3fc | mov dword ptr [ebp - 0xc8], 0xfcc33e89 // c7853cffffff05ba3078 | mov dword ptr [ebp - 0xc4], 0x7830ba05 $sequence_5 = { 03f7 898d7cefffff ff15???????? 8bbd64efffff 33c0 83c40c 898568efffff } // n = 7, score = 100 // 03f7 | add esi, edi // 898d7cefffff | mov dword ptr [ebp - 0x1084], ecx // ff15???????? | // 8bbd64efffff | mov edi, dword ptr [ebp - 0x109c] // 33c0 | xor eax, eax // 83c40c | add esp, 0xc // 898568efffff | mov dword ptr [ebp - 0x1098], eax $sequence_6 = { 8bce e8???????? 8b45f8 83c410 85c0 0f8506010000 } // n = 6, score = 100 // 8bce | mov ecx, esi // e8???????? | // 8b45f8 | mov eax, dword ptr [ebp - 8] // 83c410 | add esp, 0x10 // 85c0 | test eax, eax // 0f8506010000 | jne 0x10c $sequence_7 = { eb0f 8b8e38020000 8d7901 89be38020000 8bd9 c1eb18 885804 } // n = 7, score = 100 // eb0f | jmp 0x11 // 8b8e38020000 | mov ecx, dword ptr [esi + 0x238] // 8d7901 | lea edi, [ecx + 1] // 89be38020000 | mov dword ptr [esi + 0x238], edi // 8bd9 | mov ebx, ecx // c1eb18 | shr ebx, 0x18 // 885804 | mov byte ptr [eax + 4], bl $sequence_8 = { 5d c3 8bb59cfeffff 8d95a0feffff 52 56 e8???????? } // n = 7, score = 100 // 5d | pop ebp // c3 | ret // 8bb59cfeffff | mov esi, dword ptr [ebp - 0x164] // 8d95a0feffff | lea edx, [ebp - 0x160] // 52 | push edx // 56 | push esi // e8???????? | $sequence_9 = { 8bd6 e8???????? 83c40c 8945fc 5f 8be5 5d } // n = 7, score = 100 // 8bd6 | mov edx, esi // e8???????? | // 83c40c | add esp, 0xc // 8945fc | mov dword ptr [ebp - 4], eax // 5f | pop edi // 8be5 | mov esp, ebp // 5d | pop ebp condition: 7 of them and filesize < 516096 }
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