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rule win_powerloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.powerloader." 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.powerloader" 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 = { e8???????? eb22 33c9 66666666660f1f840000000000 0fb6840c30010000 } // n = 5, score = 300 // e8???????? | // eb22 | mov dword ptr [esp + 0x380], ebx // 33c9 | nop word ptr [eax + eax] // 66666666660f1f840000000000 | dec eax // 0fb6840c30010000 | lea ecx, [esp + 0x251] $sequence_1 = { 8bf2 32db e8???????? 3bc7 7349 } // n = 5, score = 300 // 8bf2 | lea edx, [ebp - 1] // 32db | dec esp // e8???????? | // 3bc7 | lea eax, [0x3fe6] // 7349 | dec esp $sequence_2 = { e8???????? 0fb6d8 84c0 7514 } // n = 4, score = 300 // e8???????? | // 0fb6d8 | je 0x107 // 84c0 | mov bl, al // 7514 | test bl, bl $sequence_3 = { e8???????? 0fb6d8 84c0 7514 ff15???????? } // n = 5, score = 300 // e8???????? | // 0fb6d8 | dec eax // 84c0 | lea eax, [esp + 0x20] // 7514 | dec eax // ff15???????? | $sequence_4 = { 33d2 c605????????00 e8???????? 0fb6c3 } // n = 4, score = 300 // 33d2 | dec eax // c605????????00 | // e8???????? | // 0fb6c3 | mov dword ptr [esp + 0x30], eax $sequence_5 = { 32db e8???????? 3bc7 7349 } // n = 4, score = 300 // 32db | test al, al // e8???????? | // 3bc7 | jne 0x13 // 7349 | dec eax $sequence_6 = { e8???????? eb22 33c9 66666666660f1f840000000000 } // n = 4, score = 300 // e8???????? | // eb22 | mov ebx, ecx // 33c9 | dec eax // 66666666660f1f840000000000 | lea edx, [0x2cc2] $sequence_7 = { e8???????? 8b7c2430 85ed 740d } // n = 4, score = 300 // e8???????? | // 8b7c2430 | movzx eax, byte ptr [esp + 0x4d8] // 85ed | dec eax // 740d | mov edx, edi $sequence_8 = { ff15???????? 83f81f 7323 ff15???????? } // n = 4, score = 300 // ff15???????? | // 83f81f | lea ecx, [esp + 0x40] // 7323 | dec eax // ff15???????? | $sequence_9 = { ff15???????? 83f803 7405 83f802 7530 } // n = 5, score = 300 // ff15???????? | // 83f803 | je 0xa3 // 7405 | pop edi // 83f802 | pop esi // 7530 | pop ebx condition: 7 of them and filesize < 155648 }
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