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rule win_murofet_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.murofet." 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.murofet" 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 = { 3c02 72e5 e8???????? a2???????? 84c0 7510 } // n = 6, score = 300 // 3c02 | cmp al, 2 // 72e5 | jb 0xffffffe7 // e8???????? | // a2???????? | // 84c0 | test al, al // 7510 | jne 0x12 $sequence_1 = { 7504 3c02 72bf b001 } // n = 4, score = 300 // 7504 | jne 6 // 3c02 | cmp al, 2 // 72bf | jb 0xffffffc1 // b001 | mov al, 1 $sequence_2 = { 3c02 72e5 e8???????? a2???????? } // n = 4, score = 300 // 3c02 | cmp al, 2 // 72e5 | jb 0xffffffe7 // e8???????? | // a2???????? | $sequence_3 = { e8???????? e8???????? 3c02 72e5 e8???????? a2???????? 84c0 } // n = 7, score = 300 // e8???????? | // e8???????? | // 3c02 | cmp al, 2 // 72e5 | jb 0xffffffe7 // e8???????? | // a2???????? | // 84c0 | test al, al $sequence_4 = { 6a10 8d4624 55 50 ff15???????? 83c40c } // n = 6, score = 300 // 6a10 | push 0x10 // 8d4624 | lea eax, [esi + 0x24] // 55 | push ebp // 50 | push eax // ff15???????? | // 83c40c | add esp, 0xc $sequence_5 = { c3 e8???????? 33c0 c20400 55 8bec 83ec68 } // n = 7, score = 300 // c3 | ret // e8???????? | // 33c0 | xor eax, eax // c20400 | ret 4 // 55 | push ebp // 8bec | mov ebp, esp // 83ec68 | sub esp, 0x68 $sequence_6 = { e8???????? 33c0 c20400 55 8bec 83ec68 53 } // n = 7, score = 300 // e8???????? | // 33c0 | xor eax, eax // c20400 | ret 4 // 55 | push ebp // 8bec | mov ebp, esp // 83ec68 | sub esp, 0x68 // 53 | push ebx $sequence_7 = { 6a10 8d4624 55 50 } // n = 4, score = 300 // 6a10 | push 0x10 // 8d4624 | lea eax, [esi + 0x24] // 55 | push ebp // 50 | push eax $sequence_8 = { 72e5 e8???????? a2???????? 84c0 7510 } // n = 5, score = 300 // 72e5 | jb 0xffffffe7 // e8???????? | // a2???????? | // 84c0 | test al, al // 7510 | jne 0x12 $sequence_9 = { ff15???????? c6443eff00 83f8ff 7509 56 } // n = 5, score = 300 // ff15???????? | // c6443eff00 | mov byte ptr [esi + edi - 1], 0 // 83f8ff | cmp eax, -1 // 7509 | jne 0xb // 56 | push esi condition: 7 of them and filesize < 622592 }
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