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rule win_nexster_bot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.nexster_bot." 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.nexster_bot" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 8b0c8d20804100 83e61f c1e606 89040e 8bc3 5f 5e } // n = 7, score = 100 // 8b0c8d20804100 | mov ecx, dword ptr [ecx*4 + 0x418020] // 83e61f | and esi, 0x1f // c1e606 | shl esi, 6 // 89040e | mov dword ptr [esi + ecx], eax // 8bc3 | mov eax, ebx // 5f | pop edi // 5e | pop esi $sequence_1 = { 66898dbc050000 e8???????? 83c424 8d85bc050000 50 6804010000 } // n = 6, score = 100 // 66898dbc050000 | mov word ptr [ebp + 0x5bc], cx // e8???????? | // 83c424 | add esp, 0x24 // 8d85bc050000 | lea eax, [ebp + 0x5bc] // 50 | push eax // 6804010000 | push 0x104 $sequence_2 = { 8d542438 52 6a00 6a00 6a00 6a01 6a00 } // n = 7, score = 100 // 8d542438 | lea edx, [esp + 0x38] // 52 | push edx // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 6a01 | push 1 // 6a00 | push 0 $sequence_3 = { 33f6 33c0 0fbe84c1b0194100 6a07 c1f804 59 } // n = 6, score = 100 // 33f6 | xor esi, esi // 33c0 | xor eax, eax // 0fbe84c1b0194100 | movsx eax, byte ptr [ecx + eax*8 + 0x4119b0] // 6a07 | push 7 // c1f804 | sar eax, 4 // 59 | pop ecx $sequence_4 = { 3ac3 752d 56 6a03 8d542415 6a01 } // n = 6, score = 100 // 3ac3 | cmp al, bl // 752d | jne 0x2f // 56 | push esi // 6a03 | push 3 // 8d542415 | lea edx, [esp + 0x15] // 6a01 | push 1 $sequence_5 = { e8???????? 8b742410 8d942494000000 8bc6 2bd6 } // n = 5, score = 100 // e8???????? | // 8b742410 | mov esi, dword ptr [esp + 0x10] // 8d942494000000 | lea edx, [esp + 0x94] // 8bc6 | mov eax, esi // 2bd6 | sub edx, esi $sequence_6 = { 8d0cbd20804100 8901 8305????????20 8b11 81c200080000 } // n = 5, score = 100 // 8d0cbd20804100 | lea ecx, [edi*4 + 0x418020] // 8901 | mov dword ptr [ecx], eax // 8305????????20 | // 8b11 | mov edx, dword ptr [ecx] // 81c200080000 | add edx, 0x800 $sequence_7 = { 6a00 52 8885c0140000 e8???????? } // n = 4, score = 100 // 6a00 | push 0 // 52 | push edx // 8885c0140000 | mov byte ptr [ebp + 0x14c0], al // e8???????? | $sequence_8 = { 83c40c 8d8dbc0f0000 8d95bc150000 8a01 8802 41 } // n = 6, score = 100 // 83c40c | add esp, 0xc // 8d8dbc0f0000 | lea ecx, [ebp + 0xfbc] // 8d95bc150000 | lea edx, [ebp + 0x15bc] // 8a01 | mov al, byte ptr [ecx] // 8802 | mov byte ptr [edx], al // 41 | inc ecx $sequence_9 = { 50 ff15???????? 68ff010000 8be8 } // n = 4, score = 100 // 50 | push eax // ff15???????? | // 68ff010000 | push 0x1ff // 8be8 | mov ebp, eax condition: 7 of them and filesize < 245760 }
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