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rule win_ployx_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.ployx." 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.ployx" 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 = { 8bc3 25ff000000 59 3bf0 59 7443 } // n = 6, score = 100 // 8bc3 | mov eax, ebx // 25ff000000 | and eax, 0xff // 59 | pop ecx // 3bf0 | cmp esi, eax // 59 | pop ecx // 7443 | je 0x45 $sequence_1 = { 33db 897df8 e8???????? 397dfc 59 59 } // n = 6, score = 100 // 33db | xor ebx, ebx // 897df8 | mov dword ptr [ebp - 8], edi // e8???????? | // 397dfc | cmp dword ptr [ebp - 4], edi // 59 | pop ecx // 59 | pop ecx $sequence_2 = { 33ff 59 85c0 7e19 8bf0 8bfe 6a20 } // n = 7, score = 100 // 33ff | xor edi, edi // 59 | pop ecx // 85c0 | test eax, eax // 7e19 | jle 0x1b // 8bf0 | mov esi, eax // 8bfe | mov edi, esi // 6a20 | push 0x20 $sequence_3 = { 66ab ff35???????? aa 8d8588faffff 68???????? 50 } // n = 6, score = 100 // 66ab | stosw word ptr es:[edi], ax // ff35???????? | // aa | stosb byte ptr es:[edi], al // 8d8588faffff | lea eax, [ebp - 0x578] // 68???????? | // 50 | push eax $sequence_4 = { 8d3c78 8d0437 50 e8???????? 8b4d08 8d3c78 8d0437 } // n = 7, score = 100 // 8d3c78 | lea edi, [eax + edi*2] // 8d0437 | lea eax, [edi + esi] // 50 | push eax // e8???????? | // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 8d3c78 | lea edi, [eax + edi*2] // 8d0437 | lea eax, [edi + esi] $sequence_5 = { b9???????? b800020000 8d5f02 99 f7fb 47 8901 } // n = 7, score = 100 // b9???????? | // b800020000 | mov eax, 0x200 // 8d5f02 | lea ebx, [edi + 2] // 99 | cdq // f7fb | idiv ebx // 47 | inc edi // 8901 | mov dword ptr [ecx], eax $sequence_6 = { 33ff 99 59 f7f9 8bc2 03c1 99 } // n = 7, score = 100 // 33ff | xor edi, edi // 99 | cdq // 59 | pop ecx // f7f9 | idiv ecx // 8bc2 | mov eax, edx // 03c1 | add eax, ecx // 99 | cdq $sequence_7 = { 59 8945f4 0f848f000000 8d45e8 50 } // n = 5, score = 100 // 59 | pop ecx // 8945f4 | mov dword ptr [ebp - 0xc], eax // 0f848f000000 | je 0x95 // 8d45e8 | lea eax, [ebp - 0x18] // 50 | push eax $sequence_8 = { e8???????? 83c40c 8d85a4fcffff 6a00 50 ff15???????? 8945e8 } // n = 7, score = 100 // e8???????? | // 83c40c | add esp, 0xc // 8d85a4fcffff | lea eax, [ebp - 0x35c] // 6a00 | push 0 // 50 | push eax // ff15???????? | // 8945e8 | mov dword ptr [ebp - 0x18], eax $sequence_9 = { 740f 3b7df8 7503 8975f8 57 } // n = 5, score = 100 // 740f | je 0x11 // 3b7df8 | cmp edi, dword ptr [ebp - 8] // 7503 | jne 5 // 8975f8 | mov dword ptr [ebp - 8], esi // 57 | push edi condition: 7 of them and filesize < 229376 }
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