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rule win_electric_powder_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.electric_powder." 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.electric_powder" 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 = { 8d3442 8d9588fbffff 8bc6 0f439588fbffff 2bc2 89958cf9ffff } // n = 6, score = 100 // 8d3442 | lea esi, [edx + eax*2] // 8d9588fbffff | lea edx, [ebp - 0x478] // 8bc6 | mov eax, esi // 0f439588fbffff | cmovae edx, dword ptr [ebp - 0x478] // 2bc2 | sub eax, edx // 89958cf9ffff | mov dword ptr [ebp - 0x674], edx $sequence_1 = { 52 50 8b08 ff512c 8d45a8 50 ffd6 } // n = 7, score = 100 // 52 | push edx // 50 | push eax // 8b08 | mov ecx, dword ptr [eax] // ff512c | call dword ptr [ecx + 0x2c] // 8d45a8 | lea eax, [ebp - 0x58] // 50 | push eax // ffd6 | call esi $sequence_2 = { c645fc37 8d8d28fbffff e8???????? 8d8d20fdffff c645fc38 51 8bd0 } // n = 7, score = 100 // c645fc37 | mov byte ptr [ebp - 4], 0x37 // 8d8d28fbffff | lea ecx, [ebp - 0x4d8] // e8???????? | // 8d8d20fdffff | lea ecx, [ebp - 0x2e0] // c645fc38 | mov byte ptr [ebp - 4], 0x38 // 51 | push ecx // 8bd0 | mov edx, eax $sequence_3 = { 52 8b5610 03c7 50 e8???????? 8bf8 83c40c } // n = 7, score = 100 // 52 | push edx // 8b5610 | mov edx, dword ptr [esi + 0x10] // 03c7 | add eax, edi // 50 | push eax // e8???????? | // 8bf8 | mov edi, eax // 83c40c | add esp, 0xc $sequence_4 = { f30f7e4610 660fd685f8fbffff c7461000000000 c746140f000000 c60600 8d8d30fcffff } // n = 6, score = 100 // f30f7e4610 | movq xmm0, qword ptr [esi + 0x10] // 660fd685f8fbffff | movq qword ptr [ebp - 0x408], xmm0 // c7461000000000 | mov dword ptr [esi + 0x10], 0 // c746140f000000 | mov dword ptr [esi + 0x14], 0xf // c60600 | mov byte ptr [esi], 0 // 8d8d30fcffff | lea ecx, [ebp - 0x3d0] $sequence_5 = { 0f848f010000 2b3e 8d4301 8945e0 b8abaaaa2a f7ef b8aaaaaa0a } // n = 7, score = 100 // 0f848f010000 | je 0x195 // 2b3e | sub edi, dword ptr [esi] // 8d4301 | lea eax, [ebx + 1] // 8945e0 | mov dword ptr [ebp - 0x20], eax // b8abaaaa2a | mov eax, 0x2aaaaaab // f7ef | imul edi // b8aaaaaa0a | mov eax, 0xaaaaaaa $sequence_6 = { 56 8bf1 57 8b7d08 8b4608 8945f8 8b4614 } // n = 7, score = 100 // 56 | push esi // 8bf1 | mov esi, ecx // 57 | push edi // 8b7d08 | mov edi, dword ptr [ebp + 8] // 8b4608 | mov eax, dword ptr [esi + 8] // 8945f8 | mov dword ptr [ebp - 8], eax // 8b4614 | mov eax, dword ptr [esi + 0x14] $sequence_7 = { 660f56fa 660fc5cc03 25ff000000 83c001 25fe010000 f20f593c85785f4300 660f122c85785f4300 } // n = 7, score = 100 // 660f56fa | orpd xmm7, xmm2 // 660fc5cc03 | pextrw ecx, xmm4, 3 // 25ff000000 | and eax, 0xff // 83c001 | add eax, 1 // 25fe010000 | and eax, 0x1fe // f20f593c85785f4300 | mulsd xmm7, qword ptr [eax*4 + 0x435f78] // 660f122c85785f4300 | movlpd xmm5, qword ptr [eax*4 + 0x435f78] $sequence_8 = { 8bc1 81fa00100000 7220 8d7223 3bf2 764c 8bd6 } // n = 7, score = 100 // 8bc1 | mov eax, ecx // 81fa00100000 | cmp edx, 0x1000 // 7220 | jb 0x22 // 8d7223 | lea esi, [edx + 0x23] // 3bf2 | cmp esi, edx // 764c | jbe 0x4e // 8bd6 | mov edx, esi $sequence_9 = { 50 8d8dd0fbffff e8???????? 81cf00020000 0f1000 0f118530fcffff f30f7e4010 } // n = 7, score = 100 // 50 | push eax // 8d8dd0fbffff | lea ecx, [ebp - 0x430] // e8???????? | // 81cf00020000 | or edi, 0x200 // 0f1000 | movups xmm0, xmmword ptr [eax] // 0f118530fcffff | movups xmmword ptr [ebp - 0x3d0], xmm0 // f30f7e4010 | movq xmm0, qword ptr [eax + 0x10] condition: 7 of them and filesize < 565248 }
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