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rule win_qtbot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 8b049a 03c6 50 e8???????? } // n = 4, score = 200 // 8b049a | mov eax, dword ptr [edx + ebx*4] // 03c6 | add eax, esi // 50 | push eax // e8???????? | $sequence_1 = { 7455 8b4510 89450c 8d4301 } // n = 4, score = 200 // 7455 | je 0x57 // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 89450c | mov dword ptr [ebp + 0xc], eax // 8d4301 | lea eax, [ebx + 1] $sequence_2 = { 33c0 53 8a1a 6bc80d 0fb6c3 } // n = 5, score = 200 // 33c0 | xor eax, eax // 53 | push ebx // 8a1a | mov bl, byte ptr [edx] // 6bc80d | imul ecx, eax, 0xd // 0fb6c3 | movzx eax, bl $sequence_3 = { 8bdf 8b443078 03c6 8b4824 } // n = 4, 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] $sequence_4 = { 889435fcfeffff 0fb68c1dfcfeffff 0fb6c2 03c8 8b450c 0fb6c9 8a8c0dfcfeffff } // n = 7, score = 200 // 889435fcfeffff | mov byte ptr [ebp + esi - 0x104], dl // 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] $sequence_5 = { 75e9 5b 5d c20400 } // n = 4, score = 200 // 75e9 | jne 0xffffffeb // 5b | pop ebx // 5d | pop ebp // c20400 | ret 4 $sequence_6 = { 8b450c 0fb6c9 8a8c0dfcfeffff 3008 40 89450c } // n = 6, score = 200 // 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 // 40 | inc eax // 89450c | mov dword ptr [ebp + 0xc], eax $sequence_7 = { 40 89450c 83ef01 75b1 8b4510 5f } // n = 6, score = 200 // 40 | inc eax // 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_8 = { c745e8ff000000 8b3c857c300010 c745ecffff0000 0faff9 83f801 c745f0ffffff00 } // n = 6, score = 100 // c745e8ff000000 | mov dword ptr [ebp - 0x18], 0xff // 8b3c857c300010 | mov edi, dword ptr [eax*4 + 0x1000307c] // c745ecffff0000 | mov dword ptr [ebp - 0x14], 0xffff // 0faff9 | imul edi, ecx // 83f801 | cmp eax, 1 // c745f0ffffff00 | mov dword ptr [ebp - 0x10], 0xffffff $sequence_9 = { 83f855 0f872affffff 0fb6805a210010 ff2485f6200010 8b8614080000 } // n = 5, score = 100 // 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_10 = { 837e04ff 8bd8 8d7e08 7504 8b2f eb02 } // n = 6, score = 100 // 837e04ff | cmp dword ptr [esi + 4], -1 // 8bd8 | mov ebx, eax // 8d7e08 | lea edi, [esi + 8] // 7504 | jne 6 // 8b2f | mov ebp, dword ptr [edi] // eb02 | jmp 4 $sequence_11 = { eb60 8b46f8 834de4ff 49 c745e8ff000000 8b3c857c300010 } // n = 6, score = 100 // eb60 | jmp 0x62 // 8b46f8 | mov eax, dword ptr [esi - 8] // 834de4ff | or dword ptr [ebp - 0x1c], 0xffffffff // 49 | dec ecx // c745e8ff000000 | mov dword ptr [ebp - 0x18], 0xff // 8b3c857c300010 | mov edi, dword ptr [eax*4 + 0x1000307c] $sequence_12 = { 8b7df4 8b0c855c300010 c1e705 33d2 03fe 42 } // n = 6, score = 100 // 8b7df4 | mov edi, dword ptr [ebp - 0xc] // 8b0c855c300010 | mov ecx, dword ptr [eax*4 + 0x1000305c] // c1e705 | shl edi, 5 // 33d2 | xor edx, edx // 03fe | add edi, esi // 42 | inc edx $sequence_13 = { 7518 8b46f8 8b04855c300010 c1e002 50 } // n = 5, score = 100 // 7518 | jne 0x1a // 8b46f8 | mov eax, dword ptr [esi - 8] // 8b04855c300010 | mov eax, dword ptr [eax*4 + 0x1000305c] // c1e002 | shl eax, 2 // 50 | push eax $sequence_14 = { ff15???????? 833e05 7521 6a10 6a40 } // n = 5, score = 100 // ff15???????? | // 833e05 | cmp dword ptr [esi], 5 // 7521 | jne 0x23 // 6a10 | push 0x10 // 6a40 | push 0x40 $sequence_15 = { 83661c00 83f807 0f87c7000000 ff24857e230010 } // n = 4, score = 100 // 83661c00 | and dword ptr [esi + 0x1c], 0 // 83f807 | cmp eax, 7 // 0f87c7000000 | ja 0xcd // ff24857e230010 | jmp dword ptr [eax*4 + 0x1000237e] condition: 7 of them and filesize < 57344 }
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