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rule win_powerloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" 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 = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { ff15???????? 83f81f 7323 ff15???????? } // n = 4, score = 300 // ff15???????? | // 83f81f | mov edi, ecx // 7323 | dec eax // ff15???????? | $sequence_1 = { ff15???????? 83f803 7405 83f802 7530 } // n = 5, score = 300 // ff15???????? | // 83f803 | dec eax // 7405 | lea edx, [0x40e5] // 83f802 | dec eax // 7530 | lea ecx, [esp + 0x40] $sequence_2 = { e8???????? 0fb6d8 84c0 7514 } // n = 4, score = 300 // e8???????? | // 0fb6d8 | mov dword ptr [ebp - 0x30], esi // 84c0 | mov dword ptr [ebp - 0x34], 0x407a8c // 7514 | mov dword ptr [esp + 0x38], edi $sequence_3 = { 32db e8???????? 3bc7 7349 } // n = 4, score = 300 // 32db | test al, al // e8???????? | // 3bc7 | jne 0x41 // 7349 | dec eax $sequence_4 = { 8bd0 e8???????? 85ff 740c } // n = 4, score = 300 // 8bd0 | dec esp // e8???????? | // 85ff | lea eax, [esp + 0x140] // 740c | dec eax $sequence_5 = { 33d2 ff15???????? 83f81f 7323 ff15???????? } // n = 5, score = 300 // 33d2 | movzx ecx, byte ptr [ecx + 0x4045d0] // ff15???????? | // 83f81f | lea edx, [ebx + 0x22] // 7323 | dec eax // ff15???????? | $sequence_6 = { 33d2 c605????????00 e8???????? 0fb6c3 } // n = 4, score = 300 // 33d2 | dec eax // c605????????00 | // e8???????? | // 0fb6c3 | mov dword ptr [esp + 0x30], eax $sequence_7 = { 7441 8b5c2430 85db 741d } // n = 4, score = 300 // 7441 | dec esp // 8b5c2430 | lea eax, [esp + 0x40] // 85db | dec eax // 741d | mov dword ptr [esp + 0x30], ecx $sequence_8 = { e8???????? 8b7c2430 85ed 740d } // n = 4, score = 300 // e8???????? | // 8b7c2430 | dec eax // 85ed | lea edx, [esp + 0x30] // 740d | mov edx, eax $sequence_9 = { e8???????? 0fb6d8 85ff 740c } // n = 4, score = 300 // e8???????? | // 0fb6d8 | dec eax // 85ff | lea edx, [0x1e87] // 740c | mov dword ptr [esp + 0x78], edi condition: 7 of them and filesize < 155648 }
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