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rule win_murofet_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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???????? 6a14 e8???????? 50 } // n = 4, score = 300 // e8???????? | // 6a14 | push 0x14 // e8???????? | // 50 | push eax $sequence_1 = { e8???????? 32c0 eb43 be30750000 56 } // n = 5, score = 300 // e8???????? | // 32c0 | xor al, al // eb43 | jmp 0x45 // be30750000 | mov esi, 0x7530 // 56 | push esi $sequence_2 = { 56 ff15???????? c6443eff00 83f8ff 7509 56 } // n = 6, score = 300 // 56 | push esi // ff15???????? | // c6443eff00 | mov byte ptr [esi + edi - 1], 0 // 83f8ff | cmp eax, -1 // 7509 | jne 0xb // 56 | push esi $sequence_3 = { 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_4 = { 57 56 ff15???????? c6443eff00 83f8ff 7509 56 } // n = 7, score = 300 // 57 | push edi // 56 | push esi // ff15???????? | // c6443eff00 | mov byte ptr [esi + edi - 1], 0 // 83f8ff | cmp eax, -1 // 7509 | jne 0xb // 56 | push esi $sequence_5 = { e8???????? e8???????? 3c02 72e5 } // n = 4, score = 300 // e8???????? | // e8???????? | // 3c02 | cmp al, 2 // 72e5 | jb 0xffffffe7 $sequence_6 = { e8???????? e8???????? 3c02 72e5 e8???????? a2???????? } // n = 6, score = 300 // e8???????? | // e8???????? | // 3c02 | cmp al, 2 // 72e5 | jb 0xffffffe7 // e8???????? | // a2???????? | $sequence_7 = { 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 $sequence_8 = { 53 57 56 ff15???????? c6443eff00 83f8ff } // n = 6, score = 300 // 53 | push ebx // 57 | push edi // 56 | push esi // ff15???????? | // c6443eff00 | mov byte ptr [esi + edi - 1], 0 // 83f8ff | cmp eax, -1 $sequence_9 = { 53 57 56 ff15???????? c6443eff00 83f8ff 7509 } // n = 7, score = 300 // 53 | push ebx // 57 | push edi // 56 | push esi // ff15???????? | // c6443eff00 | mov byte ptr [esi + edi - 1], 0 // 83f8ff | cmp eax, -1 // 7509 | jne 0xb condition: 7 of them and filesize < 622592 }
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