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rule win_qtbot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.qtbot." 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.qtbot" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 89450c 83ef01 75b1 8b4510 5f } // n = 5, score = 200 // 89450c | mov dword ptr [ebp + 0xc], eax // 83ef01 | sub edi, 1 // 75b1 | jne 0xffffffb3 // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 5f | pop edi $sequence_1 = { 0fb68c1dfcfeffff 0fb6c2 03c8 8b450c 0fb6c9 8a8c0dfcfeffff 3008 } // n = 7, score = 200 // 0fb68c1dfcfeffff | movzx ecx, byte ptr [ebp + ebx - 0x104] // 0fb6c2 | movzx eax, dl // 03c8 | add ecx, eax // 8b450c | mov eax, dword ptr [ebp + 0xc] // 0fb6c9 | movzx ecx, cl // 8a8c0dfcfeffff | mov cl, byte ptr [ebp + ecx - 0x104] // 3008 | xor byte ptr [eax], cl $sequence_2 = { 8b400c 8b7014 ad 8b00 8b4010 } // n = 5, score = 200 // 8b400c | mov eax, dword ptr [eax + 0xc] // 8b7014 | mov esi, dword ptr [eax + 0x14] // ad | lodsd eax, dword ptr [esi] // 8b00 | mov eax, dword ptr [eax] // 8b4010 | mov eax, dword ptr [eax + 0x10] $sequence_3 = { 83c0d0 03c1 25ffffff00 42 8a1a 84db 75e9 } // n = 7, score = 200 // 83c0d0 | add eax, -0x30 // 03c1 | add eax, ecx // 25ffffff00 | and eax, 0xffffff // 42 | inc edx // 8a1a | mov bl, byte ptr [edx] // 84db | test bl, bl // 75e9 | jne 0xffffffeb $sequence_4 = { 742a 8b049a 03c6 50 } // n = 4, score = 200 // 742a | je 0x2c // 8b049a | mov eax, dword ptr [edx + ebx*4] // 03c6 | add eax, esi // 50 | push eax $sequence_5 = { 53 8a1a 6bc80d 0fb6c3 83c0d0 03c1 } // n = 6, score = 200 // 53 | push ebx // 8a1a | mov bl, byte ptr [edx] // 6bc80d | imul ecx, eax, 0xd // 0fb6c3 | movzx eax, bl // 83c0d0 | add eax, -0x30 // 03c1 | add eax, ecx $sequence_6 = { 8bdf 8b443078 03c6 8b4824 8b5020 } // n = 5, score = 200 // 8bdf | mov ebx, edi // 8b443078 | mov eax, dword ptr [eax + esi + 0x78] // 03c6 | add eax, esi // 8b4824 | mov ecx, dword ptr [eax + 0x24] // 8b5020 | mov edx, dword ptr [eax + 0x20] $sequence_7 = { 7455 8b4510 89450c 8d4301 0fb6d8 } // n = 5, score = 200 // 7455 | je 0x57 // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 89450c | mov dword ptr [ebp + 0xc], eax // 8d4301 | lea eax, [ebx + 1] // 0fb6d8 | movzx ebx, al $sequence_8 = { 33c0 8b7df4 8b0c855c300010 c1e705 33d2 } // n = 5, score = 100 // 33c0 | xor eax, eax // 8b7df4 | mov edi, dword ptr [ebp - 0xc] // 8b0c855c300010 | mov ecx, dword ptr [eax*4 + 0x1000305c] // c1e705 | shl edi, 5 // 33d2 | xor edx, edx $sequence_9 = { 8b4ef8 83f907 0f8781000000 ff248dfb240010 881f eb76 } // n = 6, score = 100 // 8b4ef8 | mov ecx, dword ptr [esi - 8] // 83f907 | cmp ecx, 7 // 0f8781000000 | ja 0x87 // ff248dfb240010 | jmp dword ptr [ecx*4 + 0x100024fb] // 881f | mov byte ptr [edi], bl // eb76 | jmp 0x78 $sequence_10 = { 8d41de 33db 83f855 0f872affffff 0fb6805a210010 ff2485f6200010 8b8614080000 } // n = 7, score = 100 // 8d41de | lea eax, [ecx - 0x22] // 33db | xor ebx, ebx // 83f855 | cmp eax, 0x55 // 0f872affffff | ja 0xffffff30 // 0fb6805a210010 | movzx eax, byte ptr [eax + 0x1000215a] // ff2485f6200010 | jmp dword ptr [eax*4 + 0x100020f6] // 8b8614080000 | mov eax, dword ptr [esi + 0x814] $sequence_11 = { 83c40c 53 ff15???????? 837c241000 7423 8b442418 8b4c2410 } // n = 7, score = 100 // 83c40c | add esp, 0xc // 53 | push ebx // ff15???????? | // 837c241000 | cmp dword ptr [esp + 0x10], 0 // 7423 | je 0x25 // 8b442418 | mov eax, dword ptr [esp + 0x18] // 8b4c2410 | mov ecx, dword ptr [esp + 0x10] $sequence_12 = { 59 837e04ff 8bd8 8d7e08 7504 } // n = 5, score = 100 // 59 | pop ecx // 837e04ff | cmp dword ptr [esi + 4], -1 // 8bd8 | mov ebx, eax // 8d7e08 | lea edi, [esi + 8] // 7504 | jne 6 $sequence_13 = { 57 50 53 6a00 6a00 ff15???????? 833e05 } // n = 7, score = 100 // 57 | push edi // 50 | push eax // 53 | push ebx // 6a00 | push 0 // 6a00 | push 0 // ff15???????? | // 833e05 | cmp dword ptr [esi], 5 $sequence_14 = { ff24857e230010 832700 e9???????? 53 e8???????? eb1b } // n = 6, score = 100 // ff24857e230010 | jmp dword ptr [eax*4 + 0x1000237e] // 832700 | and dword ptr [edi], 0 // e9???????? | // 53 | push ebx // e8???????? | // eb1b | jmp 0x1d $sequence_15 = { 8d7e08 7504 8b2f eb02 8bef 8b06 83661c00 } // n = 7, score = 100 // 8d7e08 | lea edi, [esi + 8] // 7504 | jne 6 // 8b2f | mov ebp, dword ptr [edi] // eb02 | jmp 4 // 8bef | mov ebp, edi // 8b06 | mov eax, dword ptr [esi] // 83661c00 | and dword ptr [esi + 0x1c], 0 condition: 7 of them and filesize < 57344 }
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