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rule osx_proton_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-10-14" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.5.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/osx.proton_rat" malpedia_rule_date = "20201014" malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9" malpedia_version = "20201014" 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 = { 89c6 48 8b85d8feffff 48 898548ffffff 48 8b3d???????? } // n = 7, score = 200 // 89c6 | mov esi, eax // 48 | dec eax // 8b85d8feffff | mov eax, dword ptr [ebp - 0x128] // 48 | dec eax // 898548ffffff | mov dword ptr [ebp - 0xb8], eax // 48 | dec eax // 8b3d???????? | $sequence_1 = { 8b8508ffffff 4a 8b1ce0 48 89df 48 } // n = 6, score = 200 // 8b8508ffffff | mov eax, dword ptr [ebp - 0xf8] // 4a | dec edx // 8b1ce0 | mov ebx, dword ptr [eax] // 48 | dec eax // 89df | mov edi, ebx // 48 | dec eax $sequence_2 = { 8bb5e0faffff 48 c785c0fbffff00000000 c785bcfbffff00000000 48 8d53ec 48 } // n = 7, score = 200 // 8bb5e0faffff | mov esi, dword ptr [ebp - 0x520] // 48 | dec eax // c785c0fbffff00000000 | mov dword ptr [ebp - 0x440], 0 // c785bcfbffff00000000 | mov dword ptr [ebp - 0x444], 0 // 48 | dec eax // 8d53ec | lea edx, [ebx - 0x14] // 48 | dec eax $sequence_3 = { ffd6 48 8b7da8 41 ffd6 48 8b7dd0 } // n = 7, score = 200 // ffd6 | call esi // 48 | dec eax // 8b7da8 | mov edi, dword ptr [ebp - 0x58] // 41 | inc ecx // ffd6 | call esi // 48 | dec eax // 8b7dd0 | mov edi, dword ptr [ebp - 0x30] $sequence_4 = { 8d9534fefeff 48 89de e8???????? 85c0 0f8549060000 48 } // n = 7, score = 200 // 8d9534fefeff | lea edx, [ebp - 0x101cc] // 48 | dec eax // 89de | mov esi, ebx // e8???????? | // 85c0 | test eax, eax // 0f8549060000 | jne 0x64f // 48 | dec eax $sequence_5 = { 8d8d90feffff 41 ffd5 48 89c7 e8???????? 49 } // n = 7, score = 200 // 8d8d90feffff | lea ecx, [ebp - 0x170] // 41 | inc ecx // ffd5 | call ebp // 48 | dec eax // 89c7 | mov edi, eax // e8???????? | // 49 | dec ecx $sequence_6 = { 660f3800cb 660fefc4 6641 0f6f6240 660fefc1 6641 0f6f4a50 } // n = 7, score = 200 // 660f3800cb | pshufb xmm1, xmm3 // 660fefc4 | pxor xmm0, xmm4 // 6641 | inc cx // 0f6f6240 | movq mm4, qword ptr [edx + 0x40] // 660fefc1 | pxor xmm0, xmm1 // 6641 | inc cx // 0f6f4a50 | movq mm1, qword ptr [edx + 0x50] $sequence_7 = { 48 85db 48 89df 75f0 49 c7450800000000 } // n = 7, score = 200 // 48 | dec eax // 85db | test ebx, ebx // 48 | dec eax // 89df | mov edi, ebx // 75f0 | jne 0xfffffff2 // 49 | dec ecx // c7450800000000 | mov dword ptr [ebp + 8], 0 $sequence_8 = { 6644 0fefc0 660f38ded9 6644 0fefc8 0f100401 48 } // n = 7, score = 200 // 6644 | inc sp // 0fefc0 | pxor mm0, mm0 // 660f38ded9 | aesdec xmm3, xmm1 // 6644 | inc sp // 0fefc8 | pxor mm1, mm0 // 0f100401 | movups xmm0, xmmword ptr [ecx + eax] // 48 | dec eax $sequence_9 = { 89c3 48 85db 7429 48 8b05???????? 4c } // n = 7, score = 200 // 89c3 | mov ebx, eax // 48 | dec eax // 85db | test ebx, ebx // 7429 | je 0x2b // 48 | dec eax // 8b05???????? | // 4c | dec esp condition: 7 of them and filesize < 1711568 }
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