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rule win_rockloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.rockloader." 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.rockloader" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 33c9 eb03 33c9 41 0bf1 40 8a08 } // n = 7, score = 300 // 33c9 | xor ecx, ecx // eb03 | jmp 5 // 33c9 | xor ecx, ecx // 41 | inc ecx // 0bf1 | or esi, ecx // 40 | inc eax // 8a08 | mov cl, byte ptr [eax] $sequence_1 = { 2bc6 8b75f0 03f8 8d46ff 394514 } // n = 5, score = 300 // 2bc6 | sub eax, esi // 8b75f0 | mov esi, dword ptr [ebp - 0x10] // 03f8 | add edi, eax // 8d46ff | lea eax, [esi - 1] // 394514 | cmp dword ptr [ebp + 0x14], eax $sequence_2 = { 8d44c1c9 eb11 80f961 7c47 80f966 7f42 0fbec9 } // n = 7, score = 300 // 8d44c1c9 | lea eax, [ecx + eax*8 - 0x37] // eb11 | jmp 0x13 // 80f961 | cmp cl, 0x61 // 7c47 | jl 0x49 // 80f966 | cmp cl, 0x66 // 7f42 | jg 0x44 // 0fbec9 | movsx ecx, cl $sequence_3 = { f6c444 7a2f 6a02 85f6 7408 } // n = 5, score = 300 // f6c444 | test ah, 0x44 // 7a2f | jp 0x31 // 6a02 | push 2 // 85f6 | test esi, esi // 7408 | je 0xa $sequence_4 = { 75f9 2bc2 8945f4 6bc003 56 } // n = 5, score = 300 // 75f9 | jne 0xfffffffb // 2bc2 | sub eax, edx // 8945f4 | mov dword ptr [ebp - 0xc], eax // 6bc003 | imul eax, eax, 3 // 56 | push esi $sequence_5 = { 33c9 2bc2 394d0c 0f95c1 03c8 } // n = 5, score = 300 // 33c9 | xor ecx, ecx // 2bc2 | sub eax, edx // 394d0c | cmp dword ptr [ebp + 0xc], ecx // 0f95c1 | setne cl // 03c8 | add ecx, eax $sequence_6 = { 48 390424 7317 48 } // n = 4, score = 300 // 48 | dec eax // 390424 | cmp dword ptr [esp], eax // 7317 | jae 0x19 // 48 | dec eax $sequence_7 = { eb03 c60608 46 47 8a07 3c22 0f85a9feffff } // n = 7, score = 300 // eb03 | jmp 5 // c60608 | mov byte ptr [esi], 8 // 46 | inc esi // 47 | inc edi // 8a07 | mov al, byte ptr [edi] // 3c22 | cmp al, 0x22 // 0f85a9feffff | jne 0xfffffeaf $sequence_8 = { ff750c e8???????? 8b4d08 8bd6 } // n = 4, score = 300 // ff750c | push dword ptr [ebp + 0xc] // e8???????? | // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 8bd6 | mov edx, esi $sequence_9 = { 8945f8 b8???????? 8945fc 8b45fc 2b45f8 8b4d08 } // n = 6, score = 300 // 8945f8 | mov dword ptr [ebp - 8], eax // b8???????? | // 8945fc | mov dword ptr [ebp - 4], eax // 8b45fc | mov eax, dword ptr [ebp - 4] // 2b45f8 | sub eax, dword ptr [ebp - 8] // 8b4d08 | mov ecx, dword ptr [ebp + 8] condition: 7 of them and filesize < 98304 }
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