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rule win_mutabaha_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { 50 8d9518ffffff 8d8d68feffff e8???????? 8d8d48ffffff c645fc09 } // n = 6, score = 100 // 50 | push eax // 8d9518ffffff | lea edx, [ebp - 0xe8] // 8d8d68feffff | lea ecx, [ebp - 0x198] // e8???????? | // 8d8d48ffffff | lea ecx, [ebp - 0xb8] // c645fc09 | mov byte ptr [ebp - 4], 9 $sequence_1 = { 8b85dcfdffff 83f808 7213 40 8d8dc8fdffff 50 ffb5c8fdffff } // n = 7, score = 100 // 8b85dcfdffff | mov eax, dword ptr [ebp - 0x224] // 83f808 | cmp eax, 8 // 7213 | jb 0x15 // 40 | inc eax // 8d8dc8fdffff | lea ecx, [ebp - 0x238] // 50 | push eax // ffb5c8fdffff | push dword ptr [ebp - 0x238] $sequence_2 = { c745b800000000 c645a800 c745c06cac4700 85c0 7409 50 e8???????? } // n = 7, score = 100 // c745b800000000 | mov dword ptr [ebp - 0x48], 0 // c645a800 | mov byte ptr [ebp - 0x58], 0 // c745c06cac4700 | mov dword ptr [ebp - 0x40], 0x47ac6c // 85c0 | test eax, eax // 7409 | je 0xb // 50 | push eax // e8???????? | $sequence_3 = { 85d2 7424 8b7c2424 8d4f08 833900 740a 40 } // n = 7, score = 100 // 85d2 | test edx, edx // 7424 | je 0x26 // 8b7c2424 | mov edi, dword ptr [esp + 0x24] // 8d4f08 | lea ecx, [edi + 8] // 833900 | cmp dword ptr [ecx], 0 // 740a | je 0xc // 40 | inc eax $sequence_4 = { 0fb7f8 eb43 83f803 7536 ff734c ff75d4 e8???????? } // n = 7, score = 100 // 0fb7f8 | movzx edi, ax // eb43 | jmp 0x45 // 83f803 | cmp eax, 3 // 7536 | jne 0x38 // ff734c | push dword ptr [ebx + 0x4c] // ff75d4 | push dword ptr [ebp - 0x2c] // e8???????? | $sequence_5 = { c745ec00000000 668945dc e8???????? 8d45dc c745fc05000000 50 8bce } // n = 7, score = 100 // c745ec00000000 | mov dword ptr [ebp - 0x14], 0 // 668945dc | mov word ptr [ebp - 0x24], ax // e8???????? | // 8d45dc | lea eax, [ebp - 0x24] // c745fc05000000 | mov dword ptr [ebp - 4], 5 // 50 | push eax // 8bce | mov ecx, esi $sequence_6 = { e8???????? c7465400000000 8bc6 8b4df4 64890d00000000 59 5e } // n = 7, score = 100 // e8???????? | // c7465400000000 | mov dword ptr [esi + 0x54], 0 // 8bc6 | mov eax, esi // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 64890d00000000 | mov dword ptr fs:[0], ecx // 59 | pop ecx // 5e | pop esi $sequence_7 = { 8d8d84fdffff c78598fdffff07000000 c78594fdffff00000000 66898584fdffff e8???????? 57 ba???????? } // n = 7, score = 100 // 8d8d84fdffff | lea ecx, [ebp - 0x27c] // c78598fdffff07000000 | mov dword ptr [ebp - 0x268], 7 // c78594fdffff00000000 | mov dword ptr [ebp - 0x26c], 0 // 66898584fdffff | mov word ptr [ebp - 0x27c], ax // e8???????? | // 57 | push edi // ba???????? | $sequence_8 = { 0103 115304 33c0 5f 5e 5b 8be5 } // n = 7, score = 100 // 0103 | add dword ptr [ebx], eax // 115304 | adc dword ptr [ebx + 4], edx // 33c0 | xor eax, eax // 5f | pop edi // 5e | pop esi // 5b | pop ebx // 8be5 | mov esp, ebp $sequence_9 = { e9???????? 8d8d5cffffff e9???????? 8d4dbc e9???????? 8d4dd4 e9???????? } // n = 7, score = 100 // e9???????? | // 8d8d5cffffff | lea ecx, [ebp - 0xa4] // e9???????? | // 8d4dbc | lea ecx, [ebp - 0x44] // e9???????? | // 8d4dd4 | lea ecx, [ebp - 0x2c] // e9???????? | condition: 7 of them and filesize < 1220608 }
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