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rule win_logtu_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 50 6a64 6a00 ff15???????? 85c0 7509 } // n = 6, score = 300 // 50 | push eax // 6a64 | push 0x64 // 6a00 | push 0 // ff15???????? | // 85c0 | test eax, eax // 7509 | jne 0xb $sequence_1 = { 8bce 68???????? e8???????? 6a3c } // n = 4, score = 300 // 8bce | mov ecx, esi // 68???????? | // e8???????? | // 6a3c | push 0x3c $sequence_2 = { 6800080000 50 8d85fcf7ffff 50 } // n = 4, score = 300 // 6800080000 | push 0x800 // 50 | push eax // 8d85fcf7ffff | lea eax, [ebp - 0x804] // 50 | push eax $sequence_3 = { 6a01 8bf0 8d85a4fdffff 68???????? 50 ff15???????? } // n = 6, score = 300 // 6a01 | push 1 // 8bf0 | mov esi, eax // 8d85a4fdffff | lea eax, [ebp - 0x25c] // 68???????? | // 50 | push eax // ff15???????? | $sequence_4 = { 8d8534ffffff 50 8d8514fcffff 50 } // n = 4, score = 300 // 8d8534ffffff | lea eax, [ebp - 0xcc] // 50 | push eax // 8d8514fcffff | lea eax, [ebp - 0x3ec] // 50 | push eax $sequence_5 = { 6a01 8bf0 8d85a4fdffff 68???????? 50 ff15???????? 83c40c } // n = 7, score = 300 // 6a01 | push 1 // 8bf0 | mov esi, eax // 8d85a4fdffff | lea eax, [ebp - 0x25c] // 68???????? | // 50 | push eax // ff15???????? | // 83c40c | add esp, 0xc $sequence_6 = { 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_7 = { 8d8578faffff 50 8d8584faffff 50 8d8574faffff } // n = 5, score = 300 // 8d8578faffff | lea eax, [ebp - 0x588] // 50 | push eax // 8d8584faffff | lea eax, [ebp - 0x57c] // 50 | push eax // 8d8574faffff | lea eax, [ebp - 0x58c] $sequence_8 = { 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_9 = { 50 8d8574faffff 50 8d8534ffffff } // n = 4, score = 300 // 50 | push eax // 8d8574faffff | lea eax, [ebp - 0x58c] // 50 | push eax // 8d8534ffffff | lea eax, [ebp - 0xcc] condition: 7 of them and filesize < 924672 }
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