Actor(s): Turla
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rule win_kazuar_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.kazuar." 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.kazuar" 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 = { eb07 48ffc3 ebc8 31c0 4883c420 5b } // n = 6, score = 300 // eb07 | mov ecx, ebx // 48ffc3 | test eax, eax // ebc8 | jne 0x183 // 31c0 | mov dword ptr [ebx], 0x80004005 // 4883c420 | mov dword ptr [ebx + 4], 0x168 // 5b | mov edi, 0x80004005 $sequence_1 = { 31c0 4885db 7428 4989db } // n = 4, score = 300 // 31c0 | dec ecx // 4885db | mov edx, ecx // 7428 | je 0x32 // 4989db | xor eax, eax $sequence_2 = { 894c2414 8d8b00020000 890424 894c2410 8d8b80030000 894c240c } // n = 6, score = 300 // 894c2414 | mov ecx, ebx // 8d8b00020000 | dec eax // 890424 | lea ebx, [esp + 0x2c] // 894c2410 | dec eax // 8d8b80030000 | mov edx, ebx // 894c240c | test eax, eax $sequence_3 = { 890424 89542408 ffd1 83ec0c 85c0 } // n = 5, score = 300 // 890424 | push ebx // 89542408 | dec eax // ffd1 | sub esp, 0x20 // 83ec0c | xor ebx, ebx // 85c0 | dec eax $sequence_4 = { 4889c1 4989c0 e8???????? 4c8d4c2428 31d2 31c9 01c0 } // n = 7, score = 300 // 4889c1 | push ebp // 4989c0 | cmp cx, 0x19 // e8???????? | // 4c8d4c2428 | lea eax, [ebp - 0x14] // 31d2 | mov dword ptr [esp], 0 // 31c9 | mov dword ptr [esp + 0xc], eax // 01c0 | lea eax, [ebp - 0x10] $sequence_5 = { 4c89442438 6689442430 4c8d442430 83c002 6689442432 48c744242800000000 } // n = 6, score = 300 // 4c89442438 | dec eax // 6689442430 | lea edx, [0xf13] // 4c8d442430 | dec eax // 83c002 | mov ecx, ebx // 6689442432 | test eax, eax // 48c744242800000000 | dec ecx $sequence_6 = { 31d2 31c9 01c0 4c89442438 6689442430 4c8d442430 } // n = 6, score = 300 // 31d2 | mov dword ptr [esp + 4], eax // 31c9 | mov edx, dword ptr [ebp - 0x2c] // 01c0 | mov dword ptr [esp + 0xc], edi // 4c89442438 | mov dword ptr [esp + 0x14], esi // 6689442430 | mov dword ptr [esp + 8], 0 // 4c8d442430 | mov dword ptr [esp + 4], eax $sequence_7 = { e8???????? 0fbec0 41ffc1 4131c0 4569c097010001 ebdd 4489c0 } // n = 7, score = 300 // e8???????? | // 0fbec0 | mov dword ptr [esp + 0xc], eax // 41ffc1 | mov word ptr [ebp - 0xe], ax // 4131c0 | lea eax, [ebp - 0x14] // 4569c097010001 | mov dword ptr [esp], 0 // ebdd | mov dword ptr [esp + 0xc], eax // 4489c0 | lea eax, [ebp - 0x10] $sequence_8 = { 4989cb 89d7 7463 4863493c } // n = 4, score = 300 // 4989cb | je 0xe6 // 89d7 | inc ebp // 7463 | xor ecx, ecx // 4863493c | dec eax $sequence_9 = { 4989cb 89d7 7463 4863493c 4c01d9 } // n = 5, score = 300 // 4989cb | je 0x99 // 89d7 | cmp word ptr [eax + edx*2], 0 // 7463 | xor eax, ebx // 4863493c | imul ebx, eax, 0x1000197 // 4c01d9 | jmp 0x80 condition: 7 of them and filesize < 81920 }
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