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rule win_punkey_pos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "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 = { 85c0 7919 8b4d10 8b550c 51 52 } // n = 6, score = 200 // 85c0 | test eax, eax // 7919 | jns 0x1b // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 8b550c | mov edx, dword ptr [ebp + 0xc] // 51 | push ecx // 52 | push edx $sequence_1 = { c20c00 75e5 56 8b7510 57 } // n = 5, score = 200 // c20c00 | ret 0xc // 75e5 | jne 0xffffffe7 // 56 | push esi // 8b7510 | mov esi, dword ptr [ebp + 0x10] // 57 | push edi $sequence_2 = { c705????????00000000 c3 3b0d???????? 7502 f3c3 } // n = 5, score = 200 // c705????????00000000 | // c3 | ret // 3b0d???????? | // 7502 | jne 4 // f3c3 | ret $sequence_3 = { 8b4508 85c0 7919 8b4d10 8b550c 51 } // n = 6, score = 200 // 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] // 51 | push ecx $sequence_4 = { 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_5 = { 8b7d0c f7c600000040 741d a1???????? 85c0 740e } // n = 6, score = 200 // 8b7d0c | mov edi, dword ptr [ebp + 0xc] // f7c600000040 | test esi, 0x40000000 // 741d | je 0x1f // a1???????? | // 85c0 | test eax, eax // 740e | je 0x10 $sequence_6 = { 50 ff15???????? 5d c20c00 75e5 } // n = 5, score = 200 // 50 | push eax // ff15???????? | // 5d | pop ebp // c20c00 | ret 0xc // 75e5 | jne 0xffffffe7 $sequence_7 = { 75e5 56 8b7510 57 8b7d0c } // n = 5, score = 200 // 75e5 | jne 0xffffffe7 // 56 | push esi // 8b7510 | mov esi, dword ptr [ebp + 0x10] // 57 | push edi // 8b7d0c | mov edi, dword ptr [ebp + 0xc] $sequence_8 = { 8b7d0c f7c600000040 741d a1???????? } // n = 4, score = 200 // 8b7d0c | mov edi, dword ptr [ebp + 0xc] // f7c600000040 | test esi, 0x40000000 // 741d | je 0x1f // a1???????? | $sequence_9 = { 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 condition: 7 of them and filesize < 499712 }
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