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rule win_rincux_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.rincux." 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.rincux" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { e8???????? 83c410 83bde8fdffff02 7524 8b85ecfdffff 8b8df0fdffff 8b95e4fdffff } // n = 7, score = 200 // e8???????? | // 83c410 | add esp, 0x10 // 83bde8fdffff02 | cmp dword ptr [ebp - 0x218], 2 // 7524 | jne 0x26 // 8b85ecfdffff | mov eax, dword ptr [ebp - 0x214] // 8b8df0fdffff | mov ecx, dword ptr [ebp - 0x210] // 8b95e4fdffff | mov edx, dword ptr [ebp - 0x21c] $sequence_1 = { b82000cc00 85d2 7405 b82000cc40 83c110 50 51 } // n = 7, score = 200 // b82000cc00 | mov eax, 0xcc0020 // 85d2 | test edx, edx // 7405 | je 7 // b82000cc40 | mov eax, 0x40cc0020 // 83c110 | add ecx, 0x10 // 50 | push eax // 51 | push ecx $sequence_2 = { 46 83fd20 89442410 89742414 72d2 8bd0 } // n = 6, score = 200 // 46 | inc esi // 83fd20 | cmp ebp, 0x20 // 89442410 | mov dword ptr [esp + 0x10], eax // 89742414 | mov dword ptr [esp + 0x14], esi // 72d2 | jb 0xffffffd4 // 8bd0 | mov edx, eax $sequence_3 = { 8b8684000000 8b542418 52 56 8d0c40 ff148da0fe0110 } // n = 6, score = 200 // 8b8684000000 | mov eax, dword ptr [esi + 0x84] // 8b542418 | mov edx, dword ptr [esp + 0x18] // 52 | push edx // 56 | push esi // 8d0c40 | lea ecx, [eax + eax*2] // ff148da0fe0110 | call dword ptr [ecx*4 + 0x1001fea0] $sequence_4 = { 89742414 897c2418 0f85c6060000 c783c41b0000ffffffff e9???????? 8b4b54 b801000000 } // n = 7, score = 200 // 89742414 | mov dword ptr [esp + 0x14], esi // 897c2418 | mov dword ptr [esp + 0x18], edi // 0f85c6060000 | jne 0x6cc // c783c41b0000ffffffff | mov dword ptr [ebx + 0x1bc4], 0xffffffff // e9???????? | // 8b4b54 | mov ecx, dword ptr [ebx + 0x54] // b801000000 | mov eax, 1 $sequence_5 = { 8bd8 8b442418 51 52 53 8d8c24d8010000 50 } // n = 7, score = 200 // 8bd8 | mov ebx, eax // 8b442418 | mov eax, dword ptr [esp + 0x18] // 51 | push ecx // 52 | push edx // 53 | push ebx // 8d8c24d8010000 | lea ecx, [esp + 0x1d8] // 50 | push eax $sequence_6 = { 83c8ff 8b8c2474010000 64890d00000000 81c480010000 c20400 } // n = 5, score = 200 // 83c8ff | or eax, 0xffffffff // 8b8c2474010000 | mov ecx, dword ptr [esp + 0x174] // 64890d00000000 | mov dword ptr fs:[0], ecx // 81c480010000 | add esp, 0x180 // c20400 | ret 4 $sequence_7 = { 66c744240c0100 66c744240e0500 66c74424100200 66c74424180800 66c744241a0700 8bc1 742a } // n = 7, score = 200 // 66c744240c0100 | mov word ptr [esp + 0xc], 1 // 66c744240e0500 | mov word ptr [esp + 0xe], 5 // 66c74424100200 | mov word ptr [esp + 0x10], 2 // 66c74424180800 | mov word ptr [esp + 0x18], 8 // 66c744241a0700 | mov word ptr [esp + 0x1a], 7 // 8bc1 | mov eax, ecx // 742a | je 0x2c $sequence_8 = { 32c0 5e 83c41c c3 b165 b072 884c2415 } // n = 7, score = 200 // 32c0 | xor al, al // 5e | pop esi // 83c41c | add esp, 0x1c // c3 | ret // b165 | mov cl, 0x65 // b072 | mov al, 0x72 // 884c2415 | mov byte ptr [esp + 0x15], cl $sequence_9 = { 85c9 0f8482000000 8b5320 85d2 7446 8b4210 85c0 } // n = 7, score = 200 // 85c9 | test ecx, ecx // 0f8482000000 | je 0x88 // 8b5320 | mov edx, dword ptr [ebx + 0x20] // 85d2 | test edx, edx // 7446 | je 0x48 // 8b4210 | mov eax, dword ptr [edx + 0x10] // 85c0 | test eax, eax condition: 7 of them and filesize < 392192 }
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