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rule win_abbath_banker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-10-14" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.5.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.abbath_banker" malpedia_rule_date = "20201014" malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9" malpedia_version = "20201014" 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 = { 5a e8???????? 8bd6 8b45fc 8b08 ff511c 33c0 } // n = 7, score = 100 // 5a | pop edx // e8???????? | // 8bd6 | mov edx, esi // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b08 | mov ecx, dword ptr [eax] // ff511c | call dword ptr [ecx + 0x1c] // 33c0 | xor eax, eax $sequence_1 = { e8???????? 8b45e4 e8???????? 83f807 7cc6 ff75e8 b809000000 } // n = 7, score = 100 // e8???????? | // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // e8???????? | // 83f807 | cmp eax, 7 // 7cc6 | jl 0xffffffc8 // ff75e8 | push dword ptr [ebp - 0x18] // b809000000 | mov eax, 9 $sequence_2 = { 0f84ed000000 833d????????0a 7d65 8d55fc 8b8314030000 e8???????? } // n = 6, score = 100 // 0f84ed000000 | je 0xf3 // 833d????????0a | // 7d65 | jge 0x67 // 8d55fc | lea edx, [ebp - 4] // 8b8314030000 | mov eax, dword ptr [ebx + 0x314] // e8???????? | $sequence_3 = { e8???????? 50 6883040000 57 e8???????? 8b83ec040000 8b4014 } // n = 7, score = 100 // e8???????? | // 50 | push eax // 6883040000 | push 0x483 // 57 | push edi // e8???????? | // 8b83ec040000 | mov eax, dword ptr [ebx + 0x4ec] // 8b4014 | mov eax, dword ptr [eax + 0x14] $sequence_4 = { e8???????? 0fb7c0 8a9834234900 668b07 e8???????? 0fb7c0 8a8034234900 } // n = 7, score = 100 // e8???????? | // 0fb7c0 | movzx eax, ax // 8a9834234900 | mov bl, byte ptr [eax + 0x492334] // 668b07 | mov ax, word ptr [edi] // e8???????? | // 0fb7c0 | movzx eax, ax // 8a8034234900 | mov al, byte ptr [eax + 0x492334] $sequence_5 = { 50 e8???????? eb16 8b83ec040000 8a9320050000 } // n = 5, score = 100 // 50 | push eax // e8???????? | // eb16 | jmp 0x18 // 8b83ec040000 | mov eax, dword ptr [ebx + 0x4ec] // 8a9320050000 | mov dl, byte ptr [ebx + 0x520] $sequence_6 = { 50 ffd5 83f801 1bdb 43 8bc3 81c4a4000000 } // n = 7, score = 100 // 50 | push eax // ffd5 | call ebp // 83f801 | cmp eax, 1 // 1bdb | sbb ebx, ebx // 43 | inc ebx // 8bc3 | mov eax, ebx // 81c4a4000000 | add esp, 0xa4 $sequence_7 = { 8b5590 a1???????? 8b08 ff5138 33c0 a3???????? ba???????? } // n = 7, score = 100 // 8b5590 | mov edx, dword ptr [ebp - 0x70] // a1???????? | // 8b08 | mov ecx, dword ptr [eax] // ff5138 | call dword ptr [ecx + 0x38] // 33c0 | xor eax, eax // a3???????? | // ba???????? | $sequence_8 = { 8b5e18 33c0 33d2 c74308???????? c7430ce87a4600 c74310587b4600 c74314b8184700 } // n = 7, score = 100 // 8b5e18 | mov ebx, dword ptr [esi + 0x18] // 33c0 | xor eax, eax // 33d2 | xor edx, edx // c74308???????? | // c7430ce87a4600 | mov dword ptr [ebx + 0xc], 0x467ae8 // c74310587b4600 | mov dword ptr [ebx + 0x10], 0x467b58 // c74314b8184700 | mov dword ptr [ebx + 0x14], 0x4718b8 $sequence_9 = { 8b550c 8b8334040000 ff9330040000 eb02 33c0 5b } // n = 6, score = 100 // 8b550c | mov edx, dword ptr [ebp + 0xc] // 8b8334040000 | mov eax, dword ptr [ebx + 0x434] // ff9330040000 | call dword ptr [ebx + 0x430] // eb02 | jmp 4 // 33c0 | xor eax, eax // 5b | pop ebx condition: 7 of them and filesize < 1409024 }
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