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rule win_mutabaha_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.mutabaha." 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.mutabaha" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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???????? 83c408 85c0 0f8435010000 f6c310 0f842c010000 33c0 } // n = 7, score = 100 // e8???????? | // 83c408 | add esp, 8 // 85c0 | test eax, eax // 0f8435010000 | je 0x13b // f6c310 | test bl, 0x10 // 0f842c010000 | je 0x132 // 33c0 | xor eax, eax $sequence_1 = { 33f6 0f1f8000000000 8b4508 8d7628 8b08 0fb60417 894431f4 } // n = 7, score = 100 // 33f6 | xor esi, esi // 0f1f8000000000 | nop dword ptr [eax] // 8b4508 | mov eax, dword ptr [ebp + 8] // 8d7628 | lea esi, dword ptr [esi + 0x28] // 8b08 | mov ecx, dword ptr [eax] // 0fb60417 | movzx eax, byte ptr [edi + edx] // 894431f4 | mov dword ptr [ecx + esi - 0xc], eax $sequence_2 = { 6a02 50 6a00 ff15???????? 6683bde8fdffff00 7504 33c9 } // n = 7, score = 100 // 6a02 | push 2 // 50 | push eax // 6a00 | push 0 // ff15???????? | // 6683bde8fdffff00 | cmp word ptr [ebp - 0x218], 0 // 7504 | jne 6 // 33c9 | xor ecx, ecx $sequence_3 = { a801 0f85dc030000 8b7de4 8bd0 ff7520 8d5f44 8bcb } // n = 7, score = 100 // a801 | test al, 1 // 0f85dc030000 | jne 0x3e2 // 8b7de4 | mov edi, dword ptr [ebp - 0x1c] // 8bd0 | mov edx, eax // ff7520 | push dword ptr [ebp + 0x20] // 8d5f44 | lea ebx, dword ptr [edi + 0x44] // 8bcb | mov ecx, ebx $sequence_4 = { 8d4df0 c745f000000000 51 50 ff15???????? 85c0 7460 } // n = 7, score = 100 // 8d4df0 | lea ecx, dword ptr [ebp - 0x10] // c745f000000000 | mov dword ptr [ebp - 0x10], 0 // 51 | push ecx // 50 | push eax // ff15???????? | // 85c0 | test eax, eax // 7460 | je 0x62 $sequence_5 = { e8???????? 6a02 68???????? 8d4d8c c645fc11 e8???????? } // n = 6, score = 100 // e8???????? | // 6a02 | push 2 // 68???????? | // 8d4d8c | lea ecx, dword ptr [ebp - 0x74] // c645fc11 | mov byte ptr [ebp - 4], 0x11 // e8???????? | $sequence_6 = { eb0d 803c3000 0f94c0 8802 84c0 742f 8b4508 } // n = 7, score = 100 // eb0d | jmp 0xf // 803c3000 | cmp byte ptr [eax + esi], 0 // 0f94c0 | sete al // 8802 | mov byte ptr [edx], al // 84c0 | test al, al // 742f | je 0x31 // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_7 = { 83c408 894704 8bc7 8b4df4 64890d00000000 59 5f } // n = 7, score = 100 // 83c408 | add esp, 8 // 894704 | mov dword ptr [edi + 4], eax // 8bc7 | mov eax, edi // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 64890d00000000 | mov dword ptr fs:[0], ecx // 59 | pop ecx // 5f | pop edi $sequence_8 = { 6a02 33c0 c785e4fdffff07000000 68???????? 8d8dd0fdffff c785e0fdffff00000000 668985d0fdffff } // n = 7, score = 100 // 6a02 | push 2 // 33c0 | xor eax, eax // c785e4fdffff07000000 | mov dword ptr [ebp - 0x21c], 7 // 68???????? | // 8d8dd0fdffff | lea ecx, dword ptr [ebp - 0x230] // c785e0fdffff00000000 | mov dword ptr [ebp - 0x220], 0 // 668985d0fdffff | mov word ptr [ebp - 0x230], ax $sequence_9 = { b301 668945d8 e8???????? 6a01 51 68???????? 8d4dd8 } // n = 7, score = 100 // b301 | mov bl, 1 // 668945d8 | mov word ptr [ebp - 0x28], ax // e8???????? | // 6a01 | push 1 // 51 | push ecx // 68???????? | // 8d4dd8 | lea ecx, dword ptr [ebp - 0x28] condition: 7 of them and filesize < 1220608 }
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