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rule win_prilex_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.prilex." 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.prilex" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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???????? 50 8b95d8feffff 8b02 50 ff15???????? 8bd0 } // n = 7, score = 400 // ff15???????? | // 50 | push eax // 8b95d8feffff | mov edx, dword ptr [ebp - 0x128] // 8b02 | mov eax, dword ptr [edx] // 50 | push eax // ff15???????? | // 8bd0 | mov edx, eax $sequence_1 = { 6a00 68ff0f1f00 e8???????? 8bf8 ffd6 } // n = 5, score = 400 // 6a00 | push 0 // 68ff0f1f00 | push 0x1f0fff // e8???????? | // 8bf8 | mov edi, eax // ffd6 | call esi $sequence_2 = { 8975d8 8975c8 8975b0 8975ac 8975b8 } // n = 5, score = 400 // 8975d8 | mov dword ptr [ebp - 0x28], esi // 8975c8 | mov dword ptr [ebp - 0x38], esi // 8975b0 | mov dword ptr [ebp - 0x50], esi // 8975ac | mov dword ptr [ebp - 0x54], esi // 8975b8 | mov dword ptr [ebp - 0x48], esi $sequence_3 = { c785b0feffff00000000 8d4d9c ff15???????? c745fc11000000 66c785f8feffffffff ba???????? } // n = 6, score = 400 // c785b0feffff00000000 | mov dword ptr [ebp - 0x150], 0 // 8d4d9c | lea ecx, dword ptr [ebp - 0x64] // ff15???????? | // c745fc11000000 | mov dword ptr [ebp - 4], 0x11 // 66c785f8feffffffff | mov word ptr [ebp - 0x108], 0xffff // ba???????? | $sequence_4 = { 51 0f8035010000 ff15???????? 8b4dd4 3bcf 7424 66833901 } // n = 7, score = 400 // 51 | push ecx // 0f8035010000 | jo 0x13b // ff15???????? | // 8b4dd4 | mov ecx, dword ptr [ebp - 0x2c] // 3bcf | cmp ecx, edi // 7424 | je 0x26 // 66833901 | cmp word ptr [ecx], 1 $sequence_5 = { 8bf0 ff15???????? 8d45c8 8d4dcc 50 51 } // n = 6, score = 400 // 8bf0 | mov esi, eax // ff15???????? | // 8d45c8 | lea eax, dword ptr [ebp - 0x38] // 8d4dcc | lea ecx, dword ptr [ebp - 0x34] // 50 | push eax // 51 | push ecx $sequence_6 = { ffd3 8d858cfdffff 8d8d6cfdffff 50 51 ff15???????? } // n = 6, score = 400 // ffd3 | call ebx // 8d858cfdffff | lea eax, dword ptr [ebp - 0x274] // 8d8d6cfdffff | lea ecx, dword ptr [ebp - 0x294] // 50 | push eax // 51 | push ecx // ff15???????? | $sequence_7 = { 8975cc e8???????? 8bd8 3bdf 0f8408010000 8b55e8 52 } // n = 7, score = 400 // 8975cc | mov dword ptr [ebp - 0x34], esi // e8???????? | // 8bd8 | mov ebx, eax // 3bdf | cmp ebx, edi // 0f8408010000 | je 0x10e // 8b55e8 | mov edx, dword ptr [ebp - 0x18] // 52 | push edx $sequence_8 = { 8b95d8feffff 8b4208 50 ff15???????? 8bd0 8d4da4 ff15???????? } // n = 7, score = 400 // 8b95d8feffff | mov edx, dword ptr [ebp - 0x128] // 8b4208 | mov eax, dword ptr [edx + 8] // 50 | push eax // ff15???????? | // 8bd0 | mov edx, eax // 8d4da4 | lea ecx, dword ptr [ebp - 0x5c] // ff15???????? | $sequence_9 = { e8???????? 8bf0 ff15???????? 8d45ac } // n = 4, score = 400 // e8???????? | // 8bf0 | mov esi, eax // ff15???????? | // 8d45ac | lea eax, dword ptr [ebp - 0x54] condition: 7 of them and filesize < 450560 }
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