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rule win_xbot_pos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.xbot_pos." 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.xbot_pos" 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 = { a1???????? 83c9ff f00fc108 49 751d 813d????????f0285600 } // n = 6, score = 100 // a1???????? | // 83c9ff | or ecx, 0xffffffff // f00fc108 | lock xadd dword ptr [eax], ecx // 49 | dec ecx // 751d | jne 0x1f // 813d????????f0285600 | $sequence_1 = { 8bcd 50 8d159ce94600 e8???????? 58 5a 8b4df4 } // n = 7, score = 100 // 8bcd | mov ecx, ebp // 50 | push eax // 8d159ce94600 | lea edx, [0x46e99c] // e8???????? | // 58 | pop eax // 5a | pop edx // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] $sequence_2 = { 8bcd 50 8d1500af4700 e8???????? 58 5a 8b4df4 } // n = 7, score = 100 // 8bcd | mov ecx, ebp // 50 | push eax // 8d1500af4700 | lea edx, [0x47af00] // e8???????? | // 58 | pop eax // 5a | pop edx // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] $sequence_3 = { 50 0fb68d1bffffff 51 e8???????? 83c410 8b4510 } // n = 6, score = 100 // 50 | push eax // 0fb68d1bffffff | movzx ecx, byte ptr [ebp - 0xe5] // 51 | push ecx // e8???????? | // 83c410 | add esp, 0x10 // 8b4510 | mov eax, dword ptr [ebp + 0x10] $sequence_4 = { e8???????? 83c404 898548feffff 8b9548feffff 8b02 89854cfeffff } // n = 6, score = 100 // e8???????? | // 83c404 | add esp, 4 // 898548feffff | mov dword ptr [ebp - 0x1b8], eax // 8b9548feffff | mov edx, dword ptr [ebp - 0x1b8] // 8b02 | mov eax, dword ptr [edx] // 89854cfeffff | mov dword ptr [ebp - 0x1b4], eax $sequence_5 = { 3b4d08 7708 8b4df8 e8???????? 8b4df8 e8???????? 8b00 } // n = 7, score = 100 // 3b4d08 | cmp ecx, dword ptr [ebp + 8] // 7708 | ja 0xa // 8b4df8 | mov ecx, dword ptr [ebp - 8] // e8???????? | // 8b4df8 | mov ecx, dword ptr [ebp - 8] // e8???????? | // 8b00 | mov eax, dword ptr [eax] $sequence_6 = { 0375dc 8b4de8 e8???????? 8930 6b75d038 0375dc 8b4de8 } // n = 7, score = 100 // 0375dc | add esi, dword ptr [ebp - 0x24] // 8b4de8 | mov ecx, dword ptr [ebp - 0x18] // e8???????? | // 8930 | mov dword ptr [eax], esi // 6b75d038 | imul esi, dword ptr [ebp - 0x30], 0x38 // 0375dc | add esi, dword ptr [ebp - 0x24] // 8b4de8 | mov ecx, dword ptr [ebp - 0x18] $sequence_7 = { 7409 c6850fffffff01 eb07 c6850fffffff00 6854070000 68???????? 8b4508 } // n = 7, score = 100 // 7409 | je 0xb // c6850fffffff01 | mov byte ptr [ebp - 0xf1], 1 // eb07 | jmp 9 // c6850fffffff00 | mov byte ptr [ebp - 0xf1], 0 // 6854070000 | push 0x754 // 68???????? | // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_8 = { 8b148dd49d5400 52 68???????? 6a00 6a00 6a00 } // n = 6, score = 100 // 8b148dd49d5400 | mov edx, dword ptr [ecx*4 + 0x549dd4] // 52 | push edx // 68???????? | // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 $sequence_9 = { 7311 f30f7e0e 83e908 8d7608 660fd60f 8d7f08 8b048d949a4900 } // n = 7, score = 100 // 7311 | jae 0x13 // f30f7e0e | movq xmm1, qword ptr [esi] // 83e908 | sub ecx, 8 // 8d7608 | lea esi, [esi + 8] // 660fd60f | movq qword ptr [edi], xmm1 // 8d7f08 | lea edi, [edi + 8] // 8b048d949a4900 | mov eax, dword ptr [ecx*4 + 0x499a94] condition: 7 of them and filesize < 3031040 }
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