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rule win_gacrux_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 0f848e000000 41 83482120 49 8b01 49 83c108 } // n = 7, score = 300 // 0f848e000000 | je 0x94 // 41 | inc ecx // 83482120 | or dword ptr [eax + 0x21], 0x20 // 49 | dec ecx // 8b01 | mov eax, dword ptr [ecx] // 49 | dec ecx // 83c108 | add ecx, 8 $sequence_1 = { 894808 48 8b4c2430 48 894810 8b4c2444 } // n = 6, score = 300 // 894808 | mov dword ptr [eax + 8], ecx // 48 | dec eax // 8b4c2430 | mov ecx, dword ptr [esp + 0x30] // 48 | dec eax // 894810 | mov dword ptr [eax + 0x10], ecx // 8b4c2444 | mov ecx, dword ptr [esp + 0x44] $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 = { 6bc838 48 8b05???????? 8b540120 c1ea02 1bd2 3bd6 } // n = 7, score = 300 // 6bc838 | imul ecx, eax, 0x38 // 48 | dec eax // 8b05???????? | // 8b540120 | mov edx, dword ptr [ecx + eax + 0x20] // c1ea02 | shr edx, 2 // 1bd2 | sbb edx, edx // 3bd6 | cmp edx, esi $sequence_4 = { 7543 48 85db 7409 } // n = 4, score = 300 // 7543 | jne 0x45 // 48 | dec eax // 85db | test ebx, ebx // 7409 | je 0xb $sequence_5 = { 8b3a 48 8bcd 48 c1e91d 48 8bc5 } // n = 7, score = 300 // 8b3a | mov edi, dword ptr [edx] // 48 | dec eax // 8bcd | mov ecx, ebp // 48 | dec eax // c1e91d | shr ecx, 0x1d // 48 | dec eax // 8bc5 | mov eax, ebp $sequence_6 = { 41 ffc1 49 83c204 41 81f900010000 } // n = 6, score = 300 // 41 | inc ecx // ffc1 | inc ecx // 49 | dec ecx // 83c204 | add edx, 4 // 41 | inc ecx // 81f900010000 | cmp ecx, 0x100 $sequence_7 = { 0fb7ee 66c1ed08 45 8a780c 45 8bda 45 } // n = 7, score = 300 // 0fb7ee | movzx ebp, si // 66c1ed08 | shr bp, 8 // 45 | inc ebp // 8a780c | mov bh, byte ptr [eax + 0xc] // 45 | inc ebp // 8bda | mov ebx, edx // 45 | inc ebp $sequence_8 = { 56 41 57 48 83ec50 49 63e8 } // n = 7, score = 300 // 56 | push esi // 41 | inc ecx // 57 | push edi // 48 | dec eax // 83ec50 | sub esp, 0x50 // 49 | dec ecx // 63e8 | arpl ax, bp $sequence_9 = { 4d 033e 45 0fb6ed 49 8bcf } // n = 6, score = 300 // 4d | dec ebp // 033e | add edi, dword ptr [esi] // 45 | inc ebp // 0fb6ed | movzx ebp, ch // 49 | dec ecx // 8bcf | mov ecx, edi condition: 7 of them and filesize < 122880 }
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