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rule win_powerloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "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 = { 8bd0 e8???????? 85ff 740c } // n = 4, score = 300 // 8bd0 | inc esp // e8???????? | // 85ff | mov eax, ebx // 740c | dec eax $sequence_1 = { e8???????? 0fb6d8 84c0 7514 ff15???????? } // n = 5, score = 300 // e8???????? | // 0fb6d8 | jne 0x59b // 84c0 | je 0x500 // 7514 | pop edi // ff15???????? | $sequence_2 = { 8bf2 32db e8???????? 3bc7 7349 } // n = 5, score = 300 // 8bf2 | test al, al // 32db | dec esp // e8???????? | // 3bc7 | lea ecx, [ebx - 0x20] // 7349 | dec eax $sequence_3 = { 33d2 ff15???????? 83f81f 7323 } // n = 4, score = 300 // 33d2 | dec eax // ff15???????? | // 83f81f | lea edx, [0x1ad7] // 7323 | inc ebp $sequence_4 = { 0fb6d8 84c0 7514 ff15???????? } // n = 4, score = 300 // 0fb6d8 | jne 0x28 // 84c0 | movzx esi, byte ptr [esi + 0x409130] // 7514 | mov bl, byte ptr [ebp - 1] // ff15???????? | $sequence_5 = { ff15???????? 83f81f 7323 ff15???????? } // n = 4, score = 300 // ff15???????? | // 83f81f | dec eax // 7323 | lea ecx, [esp + 0x40] // ff15???????? | $sequence_6 = { 7441 8b5c2430 85db 741d } // n = 4, score = 300 // 7441 | lea edx, [esp + 0x130] // 8b5c2430 | dec eax // 85db | lea ecx, [0x1cc5] // 741d | dec eax $sequence_7 = { e8???????? 8b7c2430 85ed 740d } // n = 4, score = 300 // e8???????? | // 8b7c2430 | mov edx, ebx // 85ed | movzx eax, byte ptr [esp + 0x4d8] // 740d | dec eax $sequence_8 = { e8???????? eb22 33c9 66666666660f1f840000000000 } // n = 4, score = 300 // e8???????? | // eb22 | cmp word ptr [eax + 4], dx // 33c9 | mov ebx, ecx // 66666666660f1f840000000000 | dec eax $sequence_9 = { e8???????? eb22 33c9 66666666660f1f840000000000 0fb6840c30010000 } // n = 5, score = 300 // e8???????? | // eb22 | je 0xb96 // 33c9 | dec eax // 66666666660f1f840000000000 | mov dword ptr [esp + 0x380], ebx // 0fb6840c30010000 | nop word ptr [eax + eax] condition: 7 of them and filesize < 155648 }
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