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rule win_matrix_banker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.matrix_banker." 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.matrix_banker" 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 = { 80c2a9 eb0b 8d4abf 80f905 7703 } // n = 5, score = 900 // 80c2a9 | mov ebp, dword ptr [esp + 0x50] // eb0b | dec eax // 8d4abf | add esp, 0x30 // 80f905 | dec eax // 7703 | mov edi, dword ptr [esp + 0x48] $sequence_1 = { 80f905 7702 04c9 8d4ad0 80f909 } // n = 5, score = 900 // 80f905 | je 0x18f0 // 7702 | dec eax // 04c9 | lea eax, [0x14a5c] // 8d4ad0 | dec eax // 80f909 | mov eax, dword ptr [eax + edi*8] $sequence_2 = { 7705 80c2a9 eb0b 8d4abf 80f905 7703 80c2c9 } // n = 7, score = 900 // 7705 | test eax, eax // 80c2a9 | jne 0x187c // eb0b | dec eax // 8d4abf | lea eax, [0x18d8b] // 80f905 | jmp 0x1880 // 7703 | dec eax // 80c2c9 | add eax, 0x14 $sequence_3 = { 7704 04a9 eb0a 8d48bf 80f905 7702 } // n = 6, score = 900 // 7704 | inc ebp // 04a9 | xor eax, eax // eb0a | xor edx, edx // 8d48bf | dec eax // 80f905 | mov ecx, dword ptr [edi + 8] // 7702 | dec esp $sequence_4 = { eb16 8d489f 80f905 7704 04a9 } // n = 5, score = 900 // eb16 | je 0x264 // 8d489f | mov ecx, dword ptr [ebp - 0xc] // 80f905 | inc ecx // 7704 | push ecx // 04a9 | test edi, edi $sequence_5 = { 8d4a9f 80f905 7705 80c2a9 eb0b } // n = 5, score = 900 // 8d4a9f | mov eax, esi // 80f905 | push 0 // 7705 | mov ecx, dword ptr [ebp - 4] // 80c2a9 | mov eax, edi // eb0b | push 0 $sequence_6 = { 80f905 7705 80c2a9 eb0b 8d4abf } // n = 5, score = 900 // 80f905 | dec eax // 7705 | mov eax, dword ptr [esp + 0x70] // 80c2a9 | dec eax // eb0b | mov edi, dword ptr [esp + 0x58] // 8d4abf | dec eax $sequence_7 = { eb0a 8d48bf 80f905 7702 04c9 8d4ad0 } // n = 6, score = 900 // eb0a | test eax, eax // 8d48bf | je 0xf8f // 80f905 | cmp dword ptr [eax], 0x6e756863 // 7702 | jne 0xf8f // 04c9 | or dword ptr [edi + 0x18], 2 // 8d4ad0 | mov esi, dword ptr [edi + 0x20] $sequence_8 = { 8d489f 80f905 7704 04a9 eb0a 8d48bf } // n = 6, score = 900 // 8d489f | mov word ptr [esi], di // 80f905 | mov edi, dword ptr [esp + 0xc] // 7704 | inc edi // 04a9 | mov word ptr [esi - 2], ax // eb0a | add esi, 8 // 8d48bf | mov ax, word ptr [edi] $sequence_9 = { eb18 8d4a9f 80f905 7705 80c2a9 } // n = 5, score = 900 // eb18 | je 0x310 // 8d4a9f | push esi // 80f905 | push dword ptr [ebp - 0x18] // 7705 | push edi // 80c2a9 | test edi, edi condition: 7 of them and filesize < 422912 }
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