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rule win_ployx_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 56 e8???????? 83c410 8d45ec 8d7508 50 83ec20 } // n = 7, score = 100 // 56 | push esi // e8???????? | // 83c410 | add esp, 0x10 // 8d45ec | lea eax, dword ptr [ebp - 0x14] // 8d7508 | lea esi, dword ptr [ebp + 8] // 50 | push eax // 83ec20 | sub esp, 0x20 $sequence_1 = { e8???????? bf???????? 8d45fc 57 } // n = 4, score = 100 // e8???????? | // bf???????? | // 8d45fc | lea eax, dword ptr [ebp - 4] // 57 | push edi $sequence_2 = { 3bc7 59 894604 7507 6a01 } // n = 5, score = 100 // 3bc7 | cmp eax, edi // 59 | pop ecx // 894604 | mov dword ptr [esi + 4], eax // 7507 | jne 9 // 6a01 | push 1 $sequence_3 = { 8b4508 c1f805 8d1c85007d2700 8b4508 83e01f 8d34c0 8b03 } // n = 7, score = 100 // 8b4508 | mov eax, dword ptr [ebp + 8] // c1f805 | sar eax, 5 // 8d1c85007d2700 | lea ebx, dword ptr [eax*4 + 0x277d00] // 8b4508 | mov eax, dword ptr [ebp + 8] // 83e01f | and eax, 0x1f // 8d34c0 | lea esi, dword ptr [eax + eax*8] // 8b03 | mov eax, dword ptr [ebx] $sequence_4 = { 8b7e0c 8b0490 2bf9 c1e814 c1ef0c 0fafc7 03c1 } // n = 7, score = 100 // 8b7e0c | mov edi, dword ptr [esi + 0xc] // 8b0490 | mov eax, dword ptr [eax + edx*4] // 2bf9 | sub edi, ecx // c1e814 | shr eax, 0x14 // c1ef0c | shr edi, 0xc // 0fafc7 | imul eax, edi // 03c1 | add eax, ecx $sequence_5 = { 8bd8 e8???????? 59 8945f8 59 8bc6 2bc7 } // n = 7, score = 100 // 8bd8 | mov ebx, eax // e8???????? | // 59 | pop ecx // 8945f8 | mov dword ptr [ebp - 8], eax // 59 | pop ecx // 8bc6 | mov eax, esi // 2bc7 | sub eax, edi $sequence_6 = { 50 e8???????? 50 e8???????? 8bd8 895dfc 8d7b04 } // n = 7, score = 100 // 50 | push eax // e8???????? | // 50 | push eax // e8???????? | // 8bd8 | mov ebx, eax // 895dfc | mov dword ptr [ebp - 4], ebx // 8d7b04 | lea edi, dword ptr [ebx + 4] $sequence_7 = { 8945ec 0f8438010000 80a5e8fcffff00 6a3f 59 33c0 } // n = 6, score = 100 // 8945ec | mov dword ptr [ebp - 0x14], eax // 0f8438010000 | je 0x13e // 80a5e8fcffff00 | and byte ptr [ebp - 0x318], 0 // 6a3f | push 0x3f // 59 | pop ecx // 33c0 | xor eax, eax $sequence_8 = { 8945f8 ff75f4 50 e8???????? ff75f4 e8???????? 83c41c } // n = 7, score = 100 // 8945f8 | mov dword ptr [ebp - 8], eax // ff75f4 | push dword ptr [ebp - 0xc] // 50 | push eax // e8???????? | // ff75f4 | push dword ptr [ebp - 0xc] // e8???????? | // 83c41c | add esp, 0x1c $sequence_9 = { 884dfc 80e20f 8acb 80e33f c0e202 c0e906 0ad1 } // n = 7, score = 100 // 884dfc | mov byte ptr [ebp - 4], cl // 80e20f | and dl, 0xf // 8acb | mov cl, bl // 80e33f | and bl, 0x3f // c0e202 | shl dl, 2 // c0e906 | shr cl, 6 // 0ad1 | or dl, cl condition: 7 of them and filesize < 229376 }
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