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rule win_monero_miner_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.monero_miner." 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.monero_miner" 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 = { 0fb65508 034d04 035d00 01d0 e9???????? 0fb77508 034d04 } // n = 7, score = 100 // 0fb65508 | movzx edx, byte ptr [ebp + 8] // 034d04 | add ecx, dword ptr [ebp + 4] // 035d00 | add ebx, dword ptr [ebp] // 01d0 | add eax, edx // e9???????? | // 0fb77508 | movzx esi, word ptr [ebp + 8] // 034d04 | add ecx, dword ptr [ebp + 4] $sequence_1 = { 8b842490000000 895f40 338424ac000000 8b9c2444010000 31cd 8b8c2440010000 31de } // n = 7, score = 100 // 8b842490000000 | mov eax, dword ptr [esp + 0x90] // 895f40 | mov dword ptr [edi + 0x40], ebx // 338424ac000000 | xor eax, dword ptr [esp + 0xac] // 8b9c2444010000 | mov ebx, dword ptr [esp + 0x144] // 31cd | xor ebp, ecx // 8b8c2440010000 | mov ecx, dword ptr [esp + 0x140] // 31de | xor esi, ebx $sequence_2 = { 8b442460 31f5 8bb42488000000 03742460 896c2438 89c5 897c243c } // n = 7, score = 100 // 8b442460 | mov eax, dword ptr [esp + 0x60] // 31f5 | xor ebp, esi // 8bb42488000000 | mov esi, dword ptr [esp + 0x88] // 03742460 | add esi, dword ptr [esp + 0x60] // 896c2438 | mov dword ptr [esp + 0x38], ebp // 89c5 | mov ebp, eax // 897c243c | mov dword ptr [esp + 0x3c], edi $sequence_3 = { 8b4c2424 c7042400000000 89442404 8b442420 e8???????? 85c0 89c3 } // n = 7, score = 100 // 8b4c2424 | mov ecx, dword ptr [esp + 0x24] // c7042400000000 | mov dword ptr [esp], 0 // 89442404 | mov dword ptr [esp + 4], eax // 8b442420 | mov eax, dword ptr [esp + 0x20] // e8???????? | // 85c0 | test eax, eax // 89c3 | mov ebx, eax $sequence_4 = { 8b54245c 09ce 89b424f0010000 897738 89ac24f4010000 896f3c 0fa4c204 } // n = 7, score = 100 // 8b54245c | mov edx, dword ptr [esp + 0x5c] // 09ce | or esi, ecx // 89b424f0010000 | mov dword ptr [esp + 0x1f0], esi // 897738 | mov dword ptr [edi + 0x38], esi // 89ac24f4010000 | mov dword ptr [esp + 0x1f4], ebp // 896f3c | mov dword ptr [edi + 0x3c], ebp // 0fa4c204 | shld edx, eax, 4 $sequence_5 = { 8d4c2427 89742414 895c240c 897c2408 c744240400000000 83e1f0 8b7de0 } // n = 7, score = 100 // 8d4c2427 | lea ecx, [esp + 0x27] // 89742414 | mov dword ptr [esp + 0x14], esi // 895c240c | mov dword ptr [esp + 0xc], ebx // 897c2408 | mov dword ptr [esp + 8], edi // c744240400000000 | mov dword ptr [esp + 4], 0 // 83e1f0 | and ecx, 0xfffffff0 // 8b7de0 | mov edi, dword ptr [ebp - 0x20] $sequence_6 = { 89bc24c0010000 89ac24c4010000 8bac24c8040000 036c2420 8b742460 8bbc24cc040000 137c2424 } // n = 7, score = 100 // 89bc24c0010000 | mov dword ptr [esp + 0x1c0], edi // 89ac24c4010000 | mov dword ptr [esp + 0x1c4], ebp // 8bac24c8040000 | mov ebp, dword ptr [esp + 0x4c8] // 036c2420 | add ebp, dword ptr [esp + 0x20] // 8b742460 | mov esi, dword ptr [esp + 0x60] // 8bbc24cc040000 | mov edi, dword ptr [esp + 0x4cc] // 137c2424 | adc edi, dword ptr [esp + 0x24] $sequence_7 = { c744240423000000 8b85c0040000 890424 e8???????? 85c0 7403 c60000 } // n = 7, score = 100 // c744240423000000 | mov dword ptr [esp + 4], 0x23 // 8b85c0040000 | mov eax, dword ptr [ebp + 0x4c0] // 890424 | mov dword ptr [esp], eax // e8???????? | // 85c0 | test eax, eax // 7403 | je 5 // c60000 | mov byte ptr [eax], 0 $sequence_8 = { e8???????? 8d4b50 8d5705 c7435c00000000 c7435800000000 c7435400000000 895350 } // n = 7, score = 100 // e8???????? | // 8d4b50 | lea ecx, [ebx + 0x50] // 8d5705 | lea edx, [edi + 5] // c7435c00000000 | mov dword ptr [ebx + 0x5c], 0 // c7435800000000 | mov dword ptr [ebx + 0x58], 0 // c7435400000000 | mov dword ptr [ebx + 0x54], 0 // 895350 | mov dword ptr [ebx + 0x50], edx $sequence_9 = { 8b8424b0010000 899424c4010000 8b9424b4010000 89ac24c0010000 01c1 89c5 11d3 } // n = 7, score = 100 // 8b8424b0010000 | mov eax, dword ptr [esp + 0x1b0] // 899424c4010000 | mov dword ptr [esp + 0x1c4], edx // 8b9424b4010000 | mov edx, dword ptr [esp + 0x1b4] // 89ac24c0010000 | mov dword ptr [esp + 0x1c0], ebp // 01c1 | add ecx, eax // 89c5 | mov ebp, eax // 11d3 | adc ebx, edx condition: 7 of them and filesize < 1425408 }
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