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rule win_pubload_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" version = "1" description = "Detects win.pubload." 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.pubload" malpedia_rule_date = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { 6a5c 68???????? e8???????? 83c408 33c9 } // n = 5, score = 1500 // 6a5c | push 0x5c // 68???????? | // e8???????? | // 83c408 | add esp, 8 // 33c9 | xor ecx, ecx $sequence_1 = { 6a00 ff15???????? 6a5c 68???????? e8???????? 83c408 33c9 } // n = 7, score = 1500 // 6a00 | push 0 // ff15???????? | // 6a5c | push 0x5c // 68???????? | // e8???????? | // 83c408 | add esp, 8 // 33c9 | xor ecx, ecx $sequence_2 = { 6804010000 68???????? 6a00 ff15???????? 6a5c 68???????? } // n = 6, score = 1500 // 6804010000 | push 0x104 // 68???????? | // 6a00 | push 0 // ff15???????? | // 6a5c | push 0x5c // 68???????? | $sequence_3 = { ff15???????? 6a5c 68???????? e8???????? 83c408 33c9 } // n = 6, score = 1500 // ff15???????? | // 6a5c | push 0x5c // 68???????? | // e8???????? | // 83c408 | add esp, 8 // 33c9 | xor ecx, ecx $sequence_4 = { 68???????? e8???????? 83c408 33c9 68???????? } // n = 5, score = 1500 // 68???????? | // e8???????? | // 83c408 | add esp, 8 // 33c9 | xor ecx, ecx // 68???????? | $sequence_5 = { 6804010000 68???????? 6a00 ff15???????? 6a5c 68???????? e8???????? } // n = 7, score = 1500 // 6804010000 | push 0x104 // 68???????? | // 6a00 | push 0 // ff15???????? | // 6a5c | push 0x5c // 68???????? | // e8???????? | $sequence_6 = { e8???????? 83c408 33c9 68???????? } // n = 4, score = 1500 // e8???????? | // 83c408 | add esp, 8 // 33c9 | xor ecx, ecx // 68???????? | $sequence_7 = { 68???????? e8???????? 83c408 33c9 68???????? 66894802 ff15???????? } // n = 7, score = 1500 // 68???????? | // e8???????? | // 83c408 | add esp, 8 // 33c9 | xor ecx, ecx // 68???????? | // 66894802 | mov word ptr [eax + 2], cx // ff15???????? | $sequence_8 = { 83c408 33c9 68???????? 66894802 ff15???????? } // n = 5, score = 1500 // 83c408 | add esp, 8 // 33c9 | xor ecx, ecx // 68???????? | // 66894802 | mov word ptr [eax + 2], cx // ff15???????? | $sequence_9 = { 6a00 6a00 6a00 ff15???????? c3 } // n = 5, score = 1500 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // ff15???????? | // c3 | ret condition: 7 of them and filesize < 524288 }
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