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rule win_gacrux_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.gacrux." 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.gacrux" 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 = { 32f6 4c 8be9 4c } // n = 4, score = 300 // 32f6 | xor dh, dh // 4c | dec esp // 8be9 | mov ebp, ecx // 4c | dec esp $sequence_1 = { 8905???????? 8915???????? 890d???????? 48 893d???????? 4c } // n = 6, score = 300 // 8905???????? | // 8915???????? | // 890d???????? | // 48 | dec eax // 893d???????? | // 4c | dec esp $sequence_2 = { 48 03ca 849c013c010000 740b 41 81cb00300000 45 } // n = 7, score = 300 // 48 | dec eax // 03ca | add ecx, edx // 849c013c010000 | test byte ptr [ecx + eax + 0x13c], bl // 740b | je 0xd // 41 | inc ecx // 81cb00300000 | or ebx, 0x3000 // 45 | inc ebp $sequence_3 = { e9???????? 8a4504 24c7 3c05 7550 49 } // n = 6, score = 300 // e9???????? | // 8a4504 | mov al, byte ptr [ebp + 4] // 24c7 | and al, 0xc7 // 3c05 | cmp al, 5 // 7550 | jne 0x52 // 49 | dec ecx $sequence_4 = { 85d2 7416 48 8b0d???????? 48 } // n = 5, score = 300 // 85d2 | test edx, edx // 7416 | je 0x18 // 48 | dec eax // 8b0d???????? | // 48 | dec eax $sequence_5 = { 4d 8bd7 41 80fc05 7216 be01000000 4c } // n = 7, score = 300 // 4d | dec ebp // 8bd7 | mov edx, edi // 41 | inc ecx // 80fc05 | cmp ah, 5 // 7216 | jb 0x18 // be01000000 | mov esi, 1 // 4c | dec esp $sequence_6 = { 72c9 48 8d4c2420 e8???????? 48 8b5c2440 8bc7 } // n = 7, score = 300 // 72c9 | jb 0xffffffcb // 48 | dec eax // 8d4c2420 | lea ecx, [esp + 0x20] // e8???????? | // 48 | dec eax // 8b5c2440 | mov ebx, dword ptr [esp + 0x40] // 8bc7 | mov eax, edi $sequence_7 = { f7d0 48 8b742410 41 } // n = 4, score = 300 // f7d0 | not eax // 48 | dec eax // 8b742410 | mov esi, dword ptr [esp + 0x10] // 41 | inc ecx $sequence_8 = { 41 216d00 eb1d b90f0000c0 894c2460 } // n = 5, score = 300 // 41 | inc ecx // 216d00 | and dword ptr [ebp], ebp // eb1d | jmp 0x1f // b90f0000c0 | mov ecx, 0xc000000f // 894c2460 | mov dword ptr [esp + 0x60], ecx $sequence_9 = { 03c6 83e801 746f 83e801 7463 83e801 } // n = 6, score = 300 // 03c6 | add eax, esi // 83e801 | sub eax, 1 // 746f | je 0x71 // 83e801 | sub eax, 1 // 7463 | je 0x65 // 83e801 | sub eax, 1 condition: 7 of them and filesize < 122880 }
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