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rule win_sarhust_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.sarhust." 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.sarhust" 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 = { 8d8d4cffffff e8???????? 8d8d4cffffff e8???????? 8d8d4cffffff } // n = 5, score = 200 // 8d8d4cffffff | lea ecx, [ebp - 0xb4] // e8???????? | // 8d8d4cffffff | lea ecx, [ebp - 0xb4] // e8???????? | // 8d8d4cffffff | lea ecx, [ebp - 0xb4] $sequence_1 = { e8???????? 8d8d4cffffff e8???????? 8d8d4cffffff e8???????? 6a00 ff15???????? } // n = 7, score = 200 // e8???????? | // 8d8d4cffffff | lea ecx, [ebp - 0xb4] // e8???????? | // 8d8d4cffffff | lea ecx, [ebp - 0xb4] // e8???????? | // 6a00 | push 0 // ff15???????? | $sequence_2 = { e8???????? 8d8d4cffffff e8???????? 8d8d4cffffff e8???????? 6a00 } // n = 6, score = 200 // e8???????? | // 8d8d4cffffff | lea ecx, [ebp - 0xb4] // e8???????? | // 8d8d4cffffff | lea ecx, [ebp - 0xb4] // e8???????? | // 6a00 | push 0 $sequence_3 = { eb08 8b4520 8b4d0c 8908 } // n = 4, score = 200 // eb08 | jmp 0xa // 8b4520 | mov eax, dword ptr [ebp + 0x20] // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 8908 | mov dword ptr [eax], ecx $sequence_4 = { 6801000080 ff15???????? 85c0 7408 ff15???????? } // n = 5, score = 200 // 6801000080 | push 0x80000001 // ff15???????? | // 85c0 | test eax, eax // 7408 | je 0xa // ff15???????? | $sequence_5 = { 8d8d4cffffff e8???????? 8d8d4cffffff e8???????? 6a00 ff15???????? } // n = 6, score = 200 // 8d8d4cffffff | lea ecx, [ebp - 0xb4] // e8???????? | // 8d8d4cffffff | lea ecx, [ebp - 0xb4] // e8???????? | // 6a00 | push 0 // ff15???????? | $sequence_6 = { e8???????? 8d8d4cffffff e8???????? 6a00 ff15???????? } // n = 5, score = 200 // e8???????? | // 8d8d4cffffff | lea ecx, [ebp - 0xb4] // e8???????? | // 6a00 | push 0 // ff15???????? | $sequence_7 = { 8d8d4cffffff e8???????? 8d8d4cffffff e8???????? 6a00 } // n = 5, score = 200 // 8d8d4cffffff | lea ecx, [ebp - 0xb4] // e8???????? | // 8d8d4cffffff | lea ecx, [ebp - 0xb4] // e8???????? | // 6a00 | push 0 $sequence_8 = { 8d8d4cffffff e8???????? 8d8d4cffffff e8???????? 8d8d4cffffff e8???????? 6a00 } // n = 7, score = 200 // 8d8d4cffffff | lea ecx, [ebp - 0xb4] // e8???????? | // 8d8d4cffffff | lea ecx, [ebp - 0xb4] // e8???????? | // 8d8d4cffffff | lea ecx, [ebp - 0xb4] // e8???????? | // 6a00 | push 0 $sequence_9 = { 8d8d4cffffff e8???????? 6a00 ff15???????? } // n = 4, score = 200 // 8d8d4cffffff | lea ecx, [ebp - 0xb4] // e8???????? | // 6a00 | push 0 // ff15???????? | condition: 7 of them and filesize < 114688 }
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