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rule win_logtu_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.logtu." 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.logtu" 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 = { 50 e8???????? 8d85fcf7ffff 6800040000 } // n = 4, score = 300 // 50 | push eax // e8???????? | // 8d85fcf7ffff | lea eax, [ebp - 0x804] // 6800040000 | push 0x400 $sequence_1 = { 68???????? 50 e8???????? 8d85fcf7ffff 6800040000 50 e8???????? } // n = 7, score = 300 // 68???????? | // 50 | push eax // e8???????? | // 8d85fcf7ffff | lea eax, [ebp - 0x804] // 6800040000 | push 0x400 // 50 | push eax // e8???????? | $sequence_2 = { 50 ff15???????? 6a01 8bf0 8d85a4fdffff 68???????? 50 } // n = 7, score = 300 // 50 | push eax // ff15???????? | // 6a01 | push 1 // 8bf0 | mov esi, eax // 8d85a4fdffff | lea eax, [ebp - 0x25c] // 68???????? | // 50 | push eax $sequence_3 = { 50 8d8578faffff 50 8d8584faffff 50 8d8574faffff } // n = 6, score = 300 // 50 | push eax // 8d8578faffff | lea eax, [ebp - 0x588] // 50 | push eax // 8d8584faffff | lea eax, [ebp - 0x57c] // 50 | push eax // 8d8574faffff | lea eax, [ebp - 0x58c] $sequence_4 = { 56 ff15???????? 56 ff15???????? 8b45f8 5e 8be5 } // n = 7, score = 300 // 56 | push esi // ff15???????? | // 56 | push esi // ff15???????? | // 8b45f8 | mov eax, dword ptr [ebp - 8] // 5e | pop esi // 8be5 | mov esp, ebp $sequence_5 = { 50 e8???????? 8d85fcf7ffff 6800040000 50 e8???????? } // n = 6, score = 300 // 50 | push eax // e8???????? | // 8d85fcf7ffff | lea eax, [ebp - 0x804] // 6800040000 | push 0x400 // 50 | push eax // e8???????? | $sequence_6 = { 50 8d8584faffff 50 8d8574faffff 50 8d8534ffffff 50 } // n = 7, score = 300 // 50 | push eax // 8d8584faffff | lea eax, [ebp - 0x57c] // 50 | push eax // 8d8574faffff | lea eax, [ebp - 0x58c] // 50 | push eax // 8d8534ffffff | lea eax, [ebp - 0xcc] // 50 | push eax $sequence_7 = { 8d8578faffff 50 8d8584faffff 50 } // n = 4, score = 300 // 8d8578faffff | lea eax, [ebp - 0x588] // 50 | push eax // 8d8584faffff | lea eax, [ebp - 0x57c] // 50 | push eax $sequence_8 = { 8bf0 8d85a4fdffff 68???????? 50 ff15???????? 83c40c } // n = 6, score = 300 // 8bf0 | mov esi, eax // 8d85a4fdffff | lea eax, [ebp - 0x25c] // 68???????? | // 50 | push eax // ff15???????? | // 83c40c | add esp, 0xc $sequence_9 = { 6a20 57 56 ff15???????? } // n = 4, score = 300 // 6a20 | push 0x20 // 57 | push edi // 56 | push esi // ff15???????? | condition: 7 of them and filesize < 924672 }
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