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rule win_punkey_pos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.punkey_pos." 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.punkey_pos" 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 = { ffd7 a3???????? 85c0 74ae 5f } // n = 5, score = 200 // ffd7 | call edi // a3???????? | // 85c0 | test eax, eax // 74ae | je 0xffffffb0 // 5f | pop edi $sequence_1 = { 8bec 837d0c01 56 57 756b } // n = 5, score = 200 // 8bec | mov ebp, esp // 837d0c01 | cmp dword ptr [ebp + 0xc], 1 // 56 | push esi // 57 | push edi // 756b | jne 0x6d $sequence_2 = { 837d0c01 56 57 756b 8b4508 } // n = 5, score = 200 // 837d0c01 | cmp dword ptr [ebp + 0xc], 1 // 56 | push esi // 57 | push edi // 756b | jne 0x6d // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_3 = { ff15???????? 8bf0 85f6 7508 5f 33c0 5e } // n = 7, score = 200 // ff15???????? | // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 7508 | jne 0xa // 5f | pop edi // 33c0 | xor eax, eax // 5e | pop esi $sequence_4 = { 33c0 5e 5d c20c00 8b3d???????? } // n = 5, score = 200 // 33c0 | xor eax, eax // 5e | pop esi // 5d | pop ebp // c20c00 | ret 0xc // 8b3d???????? | $sequence_5 = { 68e7070000 50 ff15???????? ff05???????? 8b0d???????? } // n = 5, score = 200 // 68e7070000 | push 0x7e7 // 50 | push eax // ff15???????? | // ff05???????? | // 8b0d???????? | $sequence_6 = { 55 8bec 8b4508 85c0 7919 8b4d10 8b550c } // n = 7, score = 200 // 55 | push ebp // 8bec | mov ebp, esp // 8b4508 | mov eax, dword ptr [ebp + 8] // 85c0 | test eax, eax // 7919 | jns 0x1b // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 8b550c | mov edx, dword ptr [ebp + 0xc] $sequence_7 = { 6a02 a3???????? ff15???????? a3???????? 33c0 } // n = 5, score = 200 // 6a02 | push 2 // a3???????? | // ff15???????? | // a3???????? | // 33c0 | xor eax, eax $sequence_8 = { 52 50 a1???????? 50 ff15???????? 5d c20c00 } // n = 7, score = 200 // 52 | push edx // 50 | push eax // a1???????? | // 50 | push eax // ff15???????? | // 5d | pop ebp // c20c00 | ret 0xc $sequence_9 = { 8bf0 85f6 7508 5f 33c0 5e } // n = 6, score = 200 // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 7508 | jne 0xa // 5f | pop edi // 33c0 | xor eax, eax // 5e | pop esi condition: 7 of them and filesize < 499712 }
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