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rule win_banatrix_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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.banatrix" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 8975c8 eb24 8b4b20 894c2408 7926 0fb7c0 89442404 } // n = 7, score = 200 // 8975c8 | mov dword ptr [ebp - 0x38], esi // eb24 | jmp 0x26 // 8b4b20 | mov ecx, dword ptr [ebx + 0x20] // 894c2408 | mov dword ptr [esp + 8], ecx // 7926 | jns 0x28 // 0fb7c0 | movzx eax, ax // 89442404 | mov dword ptr [esp + 4], eax $sequence_1 = { 8b5704 0310 8b450c 83e00f 48 83f8ff 7409 } // n = 7, score = 200 // 8b5704 | mov edx, dword ptr [edi + 4] // 0310 | add edx, dword ptr [eax] // 8b450c | mov eax, dword ptr [ebp + 0xc] // 83e00f | and eax, 0xf // 48 | dec eax // 83f8ff | cmp eax, -1 // 7409 | je 0xb $sequence_2 = { 8b45e4 81e2ffffff7f 039388000000 01f2 } // n = 4, score = 200 // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // 81e2ffffff7f | and edx, 0x7fffffff // 039388000000 | add edx, dword ptr [ebx + 0x88] // 01f2 | add edx, esi $sequence_3 = { c1e91e 83e702 83e101 01f9 01c9 034dcc } // n = 6, score = 200 // c1e91e | shr ecx, 0x1e // 83e702 | and edi, 2 // 83e101 | and ecx, 1 // 01f9 | add ecx, edi // 01c9 | add ecx, ecx // 034dcc | add ecx, dword ptr [ebp - 0x34] $sequence_4 = { ebb4 8b7dd0 03b880000000 897dcc 8b7dcc c744240414000000 } // n = 6, score = 200 // ebb4 | jmp 0xffffffb6 // 8b7dd0 | mov edi, dword ptr [ebp - 0x30] // 03b880000000 | add edi, dword ptr [eax + 0x80] // 897dcc | mov dword ptr [ebp - 0x34], edi // 8b7dcc | mov edi, dword ptr [ebp - 0x34] // c744240414000000 | mov dword ptr [esp + 4], 0x14 $sequence_5 = { 7306 c6040300 89c6 83c202 89742408 } // n = 5, score = 200 // 7306 | jae 8 // c6040300 | mov byte ptr [ebx + eax], 0 // 89c6 | mov esi, eax // 83c202 | add edx, 2 // 89742408 | mov dword ptr [esp + 8], esi $sequence_6 = { 85c0 750b 8b03 8b4028 85c0 7461 } // n = 6, score = 200 // 85c0 | test eax, eax // 750b | jne 0xd // 8b03 | mov eax, dword ptr [ebx] // 8b4028 | mov eax, dword ptr [eax + 0x28] // 85c0 | test eax, eax // 7461 | je 0x63 $sequence_7 = { 833e00 741b 8345c804 83c604 8b45c8 8b00 85c0 } // n = 7, score = 200 // 833e00 | cmp dword ptr [esi], 0 // 741b | je 0x1d // 8345c804 | add dword ptr [ebp - 0x38], 4 // 83c604 | add esi, 4 // 8b45c8 | mov eax, dword ptr [ebp - 0x38] // 8b00 | mov eax, dword ptr [eax] // 85c0 | test eax, eax $sequence_8 = { 89c7 83ec10 f3a4 894208 } // n = 4, score = 200 // 89c7 | mov edi, eax // 83ec10 | sub esp, 0x10 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 894208 | mov dword ptr [edx + 8], eax $sequence_9 = { c7430800000000 c7431000000000 894318 8b4514 89431c } // n = 5, score = 200 // c7430800000000 | mov dword ptr [ebx + 8], 0 // c7431000000000 | mov dword ptr [ebx + 0x10], 0 // 894318 | mov dword ptr [ebx + 0x18], eax // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 89431c | mov dword ptr [ebx + 0x1c], eax condition: 7 of them and filesize < 180224 }
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