Actor(s): Silent Chollima
There is no description at this point.
rule win_unidentified_105_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.unidentified_105." 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_105" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 85c0 0f95c0 84c0 742c } // n = 4, score = 200 // 85c0 | test eax, eax // 0f95c0 | setne al // 84c0 | test al, al // 742c | je 0x2e $sequence_1 = { 8bf8 8d4f02 b856555555 f7e9 8bc2 c1e81f 03c2 } // n = 7, score = 200 // 8bf8 | mov edi, eax // 8d4f02 | lea ecx, [edi + 2] // b856555555 | mov eax, 0x55555556 // f7e9 | imul ecx // 8bc2 | mov eax, edx // c1e81f | shr eax, 0x1f // 03c2 | add eax, edx $sequence_2 = { 6a00 8d8dd0feffff 51 8d95fcfeffff } // n = 4, score = 200 // 6a00 | push 0 // 8d8dd0feffff | lea ecx, [ebp - 0x130] // 51 | push ecx // 8d95fcfeffff | lea edx, [ebp - 0x104] $sequence_3 = { 8d8d94feffff 51 6800000010 50 52 ff15???????? 85c0 } // n = 7, score = 200 // 8d8d94feffff | lea ecx, [ebp - 0x16c] // 51 | push ecx // 6800000010 | push 0x10000000 // 50 | push eax // 52 | push edx // ff15???????? | // 85c0 | test eax, eax $sequence_4 = { e8???????? 83c404 50 e8???????? a1???????? 6800020000 } // n = 6, score = 200 // e8???????? | // 83c404 | add esp, 4 // 50 | push eax // e8???????? | // a1???????? | // 6800020000 | push 0x200 $sequence_5 = { 83f8ff 7459 8d9424a0010000 52 } // n = 4, score = 200 // 83f8ff | cmp eax, -1 // 7459 | je 0x5b // 8d9424a0010000 | lea edx, [esp + 0x1a0] // 52 | push edx $sequence_6 = { 68???????? 56 e8???????? 8bc6 83c454 } // n = 5, score = 200 // 68???????? | // 56 | push esi // e8???????? | // 8bc6 | mov eax, esi // 83c454 | add esp, 0x54 $sequence_7 = { 8bf8 8d4f02 b856555555 f7e9 8bc2 } // n = 5, score = 200 // 8bf8 | mov edi, eax // 8d4f02 | lea ecx, [edi + 2] // b856555555 | mov eax, 0x55555556 // f7e9 | imul ecx // 8bc2 | mov eax, edx $sequence_8 = { 8b3d???????? 8d45e4 50 33f6 } // n = 4, score = 200 // 8b3d???????? | // 8d45e4 | lea eax, [ebp - 0x1c] // 50 | push eax // 33f6 | xor esi, esi $sequence_9 = { 6800100000 8d85f8efffff 50 51 } // n = 4, score = 200 // 6800100000 | push 0x1000 // 8d85f8efffff | lea eax, [ebp - 0x1008] // 50 | push eax // 51 | push ecx condition: 7 of them and filesize < 253952 }
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