Actor(s): Lazarus Group
There is no description at this point.
rule win_unidentified_077_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.unidentified_077." 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_077" 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 = { 410fb74716 c1e80d 83e001 48896e58 894620 488d058dfcffff 48894628 } // n = 7, score = 600 // 410fb74716 | mov ecx, esi // c1e80d | test eax, eax // 83e001 | dec eax // 48896e58 | mov edx, dword ptr [ebp + 0x740] // 894620 | dec esp // 488d058dfcffff | lea eax, [0x6470] // 48894628 | dec ecx $sequence_1 = { 48895c2458 ff15???????? 488bf8 4885c0 750e ff15???????? } // n = 6, score = 600 // 48895c2458 | nop dword ptr [eax + eax] // ff15???????? | // 488bf8 | inc ecx // 4885c0 | mov eax, 0x8000 // 750e | dec eax // ff15???????? | $sequence_2 = { 85c0 7556 e8???????? e8???????? 85c0 740c 488d0dc9060000 } // n = 7, score = 600 // 85c0 | je 0x15a // 7556 | or eax, 0xffffffff // e8???????? | // e8???????? | // 85c0 | lock xadd dword ptr [ecx], eax // 740c | cmp eax, 1 // 488d0dc9060000 | jne 0x178 $sequence_3 = { 4883ec38 33c0 4c8d05b3feffff 4889442428 4533c9 } // n = 5, score = 600 // 4883ec38 | mov eax, eax // 33c0 | mov ecx, ebx // 4c8d05b3feffff | dec ecx // 4889442428 | add ecx, esp // 4533c9 | test eax, eax $sequence_4 = { 8d41ff 8b8482e8400100 85c0 7462 83f801 } // n = 5, score = 600 // 8d41ff | mov ecx, 0x40 // 8b8482e8400100 | and eax, 0x3f // 85c0 | sub ecx, eax // 7462 | dec eax // 83f801 | lea edi, [0x12d6d] $sequence_5 = { 488bd5 ff15???????? 4c8bf0 4885c0 752d 448d4804 41b800300000 } // n = 7, score = 600 // 488bd5 | mov dword ptr [esi + 0x38], eax // ff15???????? | // 4c8bf0 | dec eax // 4885c0 | lea eax, [0xfffffc9c] // 752d | dec eax // 448d4804 | mov dword ptr [esi + 0x40], eax // 41b800300000 | dec eax $sequence_6 = { 7508 8d4301 e9???????? 41b8bb010000 4c89b424e00d0000 4533c9 488d95c0020000 } // n = 7, score = 600 // 7508 | mov ecx, esi // 8d4301 | test eax, eax // e9???????? | // 41b8bb010000 | je 0xf3 // 4c89b424e00d0000 | inc esp // 4533c9 | mov eax, eax // 488d95c0020000 | mov ecx, dword ptr [edx + 4] $sequence_7 = { 488d0dc9060000 e8???????? e8???????? e8???????? } // n = 4, score = 600 // 488d0dc9060000 | dec eax // e8???????? | // e8???????? | // e8???????? | $sequence_8 = { 498784f740c70100 eb1e 488bc3 498784f740c70100 4885c0 7409 488bcb } // n = 7, score = 600 // 498784f740c70100 | lea edx, [0x12fbd] // eb1e | and ecx, 0x3f // 488bc3 | dec eax // 498784f740c70100 | mov eax, ebp // 4885c0 | dec eax // 7409 | sar eax, 6 // 488bcb | dec eax $sequence_9 = { 48d3ca 4933d0 4b8794f7e0c70100 eb2d 4c8b15???????? ebb8 } // n = 6, score = 600 // 48d3ca | mov dword ptr [esi + eax], ebp // 4933d0 | dec eax // 4b8794f7e0c70100 | lea edx, [0x13159] // eb2d | dec eax // 4c8b15???????? | // ebb8 | mov ecx, ebx condition: 7 of them and filesize < 270336 }
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