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rule win_murofet_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 7420 6a00 6880000000 6a01 } // n = 4, score = 300 // 7420 | je 0x22 // 6a00 | push 0 // 6880000000 | push 0x80 // 6a01 | push 1 $sequence_1 = { 7420 6a00 6880000000 6a01 6a00 6a01 68000000c0 } // n = 7, score = 300 // 7420 | je 0x22 // 6a00 | push 0 // 6880000000 | push 0x80 // 6a01 | push 1 // 6a00 | push 0 // 6a01 | push 1 // 68000000c0 | push 0xc0000000 $sequence_2 = { e8???????? 32c0 eb43 be30750000 } // n = 4, score = 300 // e8???????? | // 32c0 | xor al, al // eb43 | jmp 0x45 // be30750000 | mov esi, 0x7530 $sequence_3 = { 84c0 7510 e8???????? 3c04 73ce b002 } // n = 6, score = 300 // 84c0 | test al, al // 7510 | jne 0x12 // e8???????? | // 3c04 | cmp al, 4 // 73ce | jae 0xffffffd0 // b002 | mov al, 2 $sequence_4 = { 7510 e8???????? 3c04 73ce b002 } // n = 5, score = 300 // 7510 | jne 0x12 // e8???????? | // 3c04 | cmp al, 4 // 73ce | jae 0xffffffd0 // b002 | mov al, 2 $sequence_5 = { e8???????? 3c02 72e5 e8???????? a2???????? 84c0 } // n = 6, score = 300 // e8???????? | // 3c02 | cmp al, 2 // 72e5 | jb 0xffffffe7 // e8???????? | // a2???????? | // 84c0 | test al, al $sequence_6 = { 6a10 8d4624 55 50 ff15???????? } // n = 5, score = 300 // 6a10 | push 0x10 // 8d4624 | lea eax, [esi + 0x24] // 55 | push ebp // 50 | push eax // ff15???????? | $sequence_7 = { 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_8 = { 84c0 7510 e8???????? 3c04 } // n = 4, score = 300 // 84c0 | test al, al // 7510 | jne 0x12 // e8???????? | // 3c04 | cmp al, 4 $sequence_9 = { 50 53 57 56 ff15???????? c6443eff00 } // n = 6, score = 300 // 50 | push eax // 53 | push ebx // 57 | push edi // 56 | push esi // ff15???????? | // c6443eff00 | mov byte ptr [esi + edi - 1], 0 condition: 7 of them and filesize < 622592 }
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