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rule win_ployx_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 8d45c4 50 e8???????? 03d8 8d45f0 50 } // n = 6, score = 100 // 8d45c4 | lea eax, [ebp - 0x3c] // 50 | push eax // e8???????? | // 03d8 | add ebx, eax // 8d45f0 | lea eax, [ebp - 0x10] // 50 | push eax $sequence_1 = { 80c120 8888c07a2700 eb1f 83f861 7213 } // n = 5, score = 100 // 80c120 | add cl, 0x20 // 8888c07a2700 | mov byte ptr [eax + 0x277ac0], cl // eb1f | jmp 0x21 // 83f861 | cmp eax, 0x61 // 7213 | jb 0x15 $sequence_2 = { 8d859cfaffff 50 e8???????? 50 8d859cfaffff 50 8d0433 } // n = 7, score = 100 // 8d859cfaffff | lea eax, [ebp - 0x564] // 50 | push eax // e8???????? | // 50 | push eax // 8d859cfaffff | lea eax, [ebp - 0x564] // 50 | push eax // 8d0433 | lea eax, [ebx + esi] $sequence_3 = { e8???????? eb4f 53 e8???????? 59 8365f800 833d????????00 } // n = 7, score = 100 // e8???????? | // eb4f | jmp 0x51 // 53 | push ebx // e8???????? | // 59 | pop ecx // 8365f800 | and dword ptr [ebp - 8], 0 // 833d????????00 | $sequence_4 = { 8bfc f3a5 e8???????? 83c42c e9???????? } // n = 5, score = 100 // 8bfc | mov edi, esp // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // e8???????? | // 83c42c | add esp, 0x2c // e9???????? | $sequence_5 = { ff55ec ff75f0 ff15???????? 8bf0 } // n = 4, score = 100 // ff55ec | call dword ptr [ebp - 0x14] // ff75f0 | push dword ptr [ebp - 0x10] // ff15???????? | // 8bf0 | mov esi, eax $sequence_6 = { 68???????? 50 e8???????? 33c0 8d7dee ab } // n = 6, score = 100 // 68???????? | // 50 | push eax // e8???????? | // 33c0 | xor eax, eax // 8d7dee | lea edi, [ebp - 0x12] // ab | stosd dword ptr es:[edi], eax $sequence_7 = { 85c0 747e 50 e8???????? 50 } // n = 5, score = 100 // 85c0 | test eax, eax // 747e | je 0x80 // 50 | push eax // e8???????? | // 50 | push eax $sequence_8 = { ff7518 e8???????? 59 50 ff7518 ff36 } // n = 6, score = 100 // ff7518 | push dword ptr [ebp + 0x18] // e8???????? | // 59 | pop ecx // 50 | push eax // ff7518 | push dword ptr [ebp + 0x18] // ff36 | push dword ptr [esi] $sequence_9 = { 7416 8088????????10 8a9405ecfdffff 8890c07a2700 eb1c } // n = 5, score = 100 // 7416 | je 0x18 // 8088????????10 | // 8a9405ecfdffff | mov dl, byte ptr [ebp + eax - 0x214] // 8890c07a2700 | mov byte ptr [eax + 0x277ac0], dl // eb1c | jmp 0x1e condition: 7 of them and filesize < 229376 }
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