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rule win_ployx_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" 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 = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { 5d 5b c3 56 68???????? 6804010000 ff15???????? } // n = 7, score = 100 // 5d | pop ebp // 5b | pop ebx // c3 | ret // 56 | push esi // 68???????? | // 6804010000 | push 0x104 // ff15???????? | $sequence_1 = { e8???????? 8b35???????? 59 59 8d45fc 50 ffd6 } // n = 7, score = 100 // e8???????? | // 8b35???????? | // 59 | pop ecx // 59 | pop ecx // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // ffd6 | call esi $sequence_2 = { ff7610 e8???????? 8bf8 8d4701 50 e8???????? 56 } // n = 7, score = 100 // ff7610 | push dword ptr [esi + 0x10] // e8???????? | // 8bf8 | mov edi, eax // 8d4701 | lea eax, [edi + 1] // 50 | push eax // e8???????? | // 56 | push esi $sequence_3 = { e8???????? 8b0d???????? 56 ff75f0 c1e105 50 89840da8d5ffff } // n = 7, score = 100 // e8???????? | // 8b0d???????? | // 56 | push esi // ff75f0 | push dword ptr [ebp - 0x10] // c1e105 | shl ecx, 5 // 50 | push eax // 89840da8d5ffff | mov dword ptr [ebp + ecx - 0x2a58], eax $sequence_4 = { 56 57 6a03 8b5d08 99 5e 33c9 } // n = 7, score = 100 // 56 | push esi // 57 | push edi // 6a03 | push 3 // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 99 | cdq // 5e | pop esi // 33c9 | xor ecx, ecx $sequence_5 = { 720a c1e818 0500040000 eb0a c1e810 25003f0000 0bc7 } // n = 7, score = 100 // 720a | jb 0xc // c1e818 | shr eax, 0x18 // 0500040000 | add eax, 0x400 // eb0a | jmp 0xc // c1e810 | shr eax, 0x10 // 25003f0000 | and eax, 0x3f00 // 0bc7 | or eax, edi $sequence_6 = { e8???????? a1???????? c1e005 8b8405a8d5ffff 80243000 a1???????? } // n = 6, score = 100 // e8???????? | // a1???????? | // c1e005 | shl eax, 5 // 8b8405a8d5ffff | mov eax, dword ptr [ebp + eax - 0x2a58] // 80243000 | and byte ptr [eax + esi], 0 // a1???????? | $sequence_7 = { ff15???????? 6aff ff35???????? ff15???????? a1???????? 3bc6 5e } // n = 7, score = 100 // ff15???????? | // 6aff | push -1 // ff35???????? | // ff15???????? | // a1???????? | // 3bc6 | cmp eax, esi // 5e | pop esi $sequence_8 = { 8b35???????? 83c434 8d85a4fdffff 50 ffd6 8d45dc } // n = 6, score = 100 // 8b35???????? | // 83c434 | add esp, 0x34 // 8d85a4fdffff | lea eax, [ebp - 0x25c] // 50 | push eax // ffd6 | call esi // 8d45dc | lea eax, [ebp - 0x24] $sequence_9 = { 5b c3 56 68???????? 6804010000 ff15???????? 33f6 } // n = 7, score = 100 // 5b | pop ebx // c3 | ret // 56 | push esi // 68???????? | // 6804010000 | push 0x104 // ff15???????? | // 33f6 | xor esi, esi condition: 7 of them and filesize < 229376 }
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