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rule win_xbot_pos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 8b8d50fcffff 8d148d34935500 899558fcffff 8d8d2cfeffff e8???????? 8b8558fcffff 0fb64803 } // n = 7, score = 100 // 8b8d50fcffff | mov ecx, dword ptr [ebp - 0x3b0] // 8d148d34935500 | lea edx, [ecx*4 + 0x559334] // 899558fcffff | mov dword ptr [ebp - 0x3a8], edx // 8d8d2cfeffff | lea ecx, [ebp - 0x1d4] // e8???????? | // 8b8558fcffff | mov eax, dword ptr [ebp - 0x3a8] // 0fb64803 | movzx ecx, byte ptr [eax + 3] $sequence_1 = { 46 4c 002c46 4c } // n = 4, score = 100 // 46 | inc esi // 4c | dec esp // 002c46 | add byte ptr [esi + eax*2], ch // 4c | dec esp $sequence_2 = { 83e23f 6bc230 8b0c8de0465600 8b540118 8955f4 837df4ff 7412 } // n = 7, score = 100 // 83e23f | and edx, 0x3f // 6bc230 | imul eax, edx, 0x30 // 8b0c8de0465600 | mov ecx, dword ptr [ecx*4 + 0x5646e0] // 8b540118 | mov edx, dword ptr [ecx + eax + 0x18] // 8955f4 | mov dword ptr [ebp - 0xc], edx // 837df4ff | cmp dword ptr [ebp - 0xc], -1 // 7412 | je 0x14 $sequence_3 = { 8d8d74fcffff e8???????? eb1f 6a00 8d8560fcffff 50 8d8decfeffff } // n = 7, score = 100 // 8d8d74fcffff | lea ecx, [ebp - 0x38c] // e8???????? | // eb1f | jmp 0x21 // 6a00 | push 0 // 8d8560fcffff | lea eax, [ebp - 0x3a0] // 50 | push eax // 8d8decfeffff | lea ecx, [ebp - 0x114] $sequence_4 = { 8b4d08 51 8b4df8 e8???????? 8bf0 8b4df8 } // n = 6, score = 100 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 51 | push ecx // 8b4df8 | mov ecx, dword ptr [ebp - 8] // e8???????? | // 8bf0 | mov esi, eax // 8b4df8 | mov ecx, dword ptr [ebp - 8] $sequence_5 = { 837d1800 740c c785d8deffffe8905400 eb0a c785d8deffff88905400 8b85a8deffff 50 } // n = 7, score = 100 // 837d1800 | cmp dword ptr [ebp + 0x18], 0 // 740c | je 0xe // c785d8deffffe8905400 | mov dword ptr [ebp - 0x2128], 0x5490e8 // eb0a | jmp 0xc // c785d8deffff88905400 | mov dword ptr [ebp - 0x2128], 0x549088 // 8b85a8deffff | mov eax, dword ptr [ebp - 0x2158] // 50 | push eax $sequence_6 = { f3ab 0fb64508 85c0 741b 837d0c00 7515 8b4514 } // n = 7, score = 100 // f3ab | rep stosd dword ptr es:[edi], eax // 0fb64508 | movzx eax, byte ptr [ebp + 8] // 85c0 | test eax, eax // 741b | je 0x1d // 837d0c00 | cmp dword ptr [ebp + 0xc], 0 // 7515 | jne 0x17 // 8b4514 | mov eax, dword ptr [ebp + 0x14] $sequence_7 = { 8b00 50 8b4df8 e8???????? 8b08 51 8b4df8 } // n = 7, score = 100 // 8b00 | mov eax, dword ptr [eax] // 50 | push eax // 8b4df8 | mov ecx, dword ptr [ebp - 8] // e8???????? | // 8b08 | mov ecx, dword ptr [eax] // 51 | push ecx // 8b4df8 | mov ecx, dword ptr [ebp - 8] $sequence_8 = { 85db 7552 68???????? 68???????? 56 6a41 68???????? } // n = 7, score = 100 // 85db | test ebx, ebx // 7552 | jne 0x54 // 68???????? | // 68???????? | // 56 | push esi // 6a41 | push 0x41 // 68???????? | $sequence_9 = { 8b4508 8b0c853c255600 51 ff15???????? 8b5508 } // n = 5, score = 100 // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b0c853c255600 | mov ecx, dword ptr [eax*4 + 0x56253c] // 51 | push ecx // ff15???????? | // 8b5508 | mov edx, dword ptr [ebp + 8] condition: 7 of them and filesize < 3031040 }
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