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rule win_logtu_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { 8bf0 8d85a4fdffff 68???????? 50 ff15???????? } // n = 5, score = 300 // 8bf0 | mov esi, eax // 8d85a4fdffff | lea eax, [ebp - 0x25c] // 68???????? | // 50 | push eax // ff15???????? | $sequence_1 = { ff15???????? 8d8534ffffff 50 ff15???????? 6a01 } // n = 5, score = 300 // ff15???????? | // 8d8534ffffff | lea eax, [ebp - 0xcc] // 50 | push eax // ff15???????? | // 6a01 | push 1 $sequence_2 = { 50 6a64 6a00 ff15???????? 85c0 7509 8b45bc } // n = 7, score = 300 // 50 | push eax // 6a64 | push 0x64 // 6a00 | push 0 // ff15???????? | // 85c0 | test eax, eax // 7509 | jne 0xb // 8b45bc | mov eax, dword ptr [ebp - 0x44] $sequence_3 = { 8bec 81ec98050000 a1???????? 33c5 8945fc 53 } // n = 6, score = 300 // 8bec | mov ebp, esp // 81ec98050000 | sub esp, 0x598 // a1???????? | // 33c5 | xor eax, ebp // 8945fc | mov dword ptr [ebp - 4], eax // 53 | push ebx $sequence_4 = { 55 8bec 81ec98050000 a1???????? 33c5 8945fc 53 } // n = 7, score = 300 // 55 | push ebp // 8bec | mov ebp, esp // 81ec98050000 | sub esp, 0x598 // a1???????? | // 33c5 | xor eax, ebp // 8945fc | mov dword ptr [ebp - 4], eax // 53 | push ebx $sequence_5 = { 8d8574faffff 50 8d8534ffffff 50 } // n = 4, score = 300 // 8d8574faffff | lea eax, [ebp - 0x58c] // 50 | push eax // 8d8534ffffff | lea eax, [ebp - 0xcc] // 50 | push eax $sequence_6 = { 50 8d85fcf7ffff 68???????? 50 e8???????? 8d85fcf7ffff 6800040000 } // n = 7, score = 300 // 50 | push eax // 8d85fcf7ffff | lea eax, [ebp - 0x804] // 68???????? | // 50 | push eax // e8???????? | // 8d85fcf7ffff | lea eax, [ebp - 0x804] // 6800040000 | push 0x400 $sequence_7 = { 6a01 8bf0 8d85a4fdffff 68???????? } // n = 4, score = 300 // 6a01 | push 1 // 8bf0 | mov esi, eax // 8d85a4fdffff | lea eax, [ebp - 0x25c] // 68???????? | $sequence_8 = { 8d8584faffff 50 8d8574faffff 50 8d8534ffffff } // n = 5, score = 300 // 8d8584faffff | lea eax, [ebp - 0x57c] // 50 | push eax // 8d8574faffff | lea eax, [ebp - 0x58c] // 50 | push eax // 8d8534ffffff | lea eax, [ebp - 0xcc] $sequence_9 = { 8d8578faffff 50 8d8584faffff 50 } // n = 4, score = 300 // 8d8578faffff | lea eax, [ebp - 0x588] // 50 | push eax // 8d8584faffff | lea eax, [ebp - 0x57c] // 50 | push eax condition: 7 of them and filesize < 924672 }
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