Actor(s): Guru Spider
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rule win_quantloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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.quantloader" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { eb17 8b45f8 890424 e8???????? 83ec04 c745f400000000 } // n = 6, score = 500 // eb17 | jmp 0x19 // 8b45f8 | mov eax, dword ptr [ebp - 8] // 890424 | mov dword ptr [esp], eax // e8???????? | // 83ec04 | sub esp, 4 // c745f400000000 | mov dword ptr [ebp - 0xc], 0 $sequence_1 = { 8d45fc 8944240c c744240800000000 8b4510 89442404 } // n = 5, score = 500 // 8d45fc | lea eax, [ebp - 4] // 8944240c | mov dword ptr [esp + 0xc], eax // c744240800000000 | mov dword ptr [esp + 8], 0 // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 89442404 | mov dword ptr [esp + 4], eax $sequence_2 = { 55 89e5 83ec18 83e4f0 b800000000 } // n = 5, score = 500 // 55 | push ebp // 89e5 | mov ebp, esp // 83ec18 | sub esp, 0x18 // 83e4f0 | and esp, 0xfffffff0 // b800000000 | mov eax, 0 $sequence_3 = { 8945f8 b8???????? c9 c3 55 89e5 83ec28 } // n = 7, score = 500 // 8945f8 | mov dword ptr [ebp - 8], eax // b8???????? | // c9 | leave // c3 | ret // 55 | push ebp // 89e5 | mov ebp, esp // 83ec28 | sub esp, 0x28 $sequence_4 = { e8???????? c7442408???????? 89442404 c7042402000080 e8???????? 0fb6c0 83f801 } // n = 7, score = 500 // e8???????? | // c7442408???????? | // 89442404 | mov dword ptr [esp + 4], eax // c7042402000080 | mov dword ptr [esp], 0x80000002 // e8???????? | // 0fb6c0 | movzx eax, al // 83f801 | cmp eax, 1 $sequence_5 = { 85c0 0f94c0 0fb6c0 08d8 84c0 } // n = 5, score = 500 // 85c0 | test eax, eax // 0f94c0 | sete al // 0fb6c0 | movzx eax, al // 08d8 | or al, bl // 84c0 | test al, al $sequence_6 = { c744241800000000 c744241410000000 c744241000000000 c744240c00000000 } // n = 4, score = 500 // c744241800000000 | mov dword ptr [esp + 0x18], 0 // c744241410000000 | mov dword ptr [esp + 0x14], 0x10 // c744241000000000 | mov dword ptr [esp + 0x10], 0 // c744240c00000000 | mov dword ptr [esp + 0xc], 0 $sequence_7 = { 89e5 83ec18 c744240800000000 c7442404???????? 8b4508 } // n = 5, score = 500 // 89e5 | mov ebp, esp // 83ec18 | sub esp, 0x18 // c744240800000000 | mov dword ptr [esp + 8], 0 // c7442404???????? | // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_8 = { ad 85c0 740e 53 56 } // n = 5, score = 100 // ad | lodsd eax, dword ptr [esi] // 85c0 | test eax, eax // 740e | je 0x10 // 53 | push ebx // 56 | push esi $sequence_9 = { 81ec20020000 b824020000 50 33f6 6a00 6a08 ff551c } // n = 7, score = 100 // 81ec20020000 | sub esp, 0x220 // b824020000 | mov eax, 0x224 // 50 | push eax // 33f6 | xor esi, esi // 6a00 | push 0 // 6a08 | push 8 // ff551c | call dword ptr [ebp + 0x1c] $sequence_10 = { c3 60 ff553c 8bd8 8b7554 } // n = 5, score = 100 // c3 | ret // 60 | pushal // ff553c | call dword ptr [ebp + 0x3c] // 8bd8 | mov ebx, eax // 8b7554 | mov esi, dword ptr [ebp + 0x54] $sequence_11 = { b940000000 48 7410 b904000000 48 } // n = 5, score = 100 // b940000000 | mov ecx, 0x40 // 48 | dec eax // 7410 | je 0x12 // b904000000 | mov ecx, 4 // 48 | dec eax $sequence_12 = { 58 57 ab f3a5 } // n = 4, score = 100 // 58 | pop eax // 57 | push edi // ab | stosd dword ptr es:[edi], eax // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] $sequence_13 = { 58 ff6050 55 e8???????? } // n = 4, score = 100 // 58 | pop eax // ff6050 | jmp dword ptr [eax + 0x50] // 55 | push ebp // e8???????? | $sequence_14 = { 7804 7402 ebf7 33c0 03c2 } // n = 5, score = 100 // 7804 | js 6 // 7402 | je 4 // ebf7 | jmp 0xfffffff9 // 33c0 | xor eax, eax // 03c2 | add eax, edx $sequence_15 = { 7430 b902000000 48 7428 } // n = 4, score = 100 // 7430 | je 0x32 // b902000000 | mov ecx, 2 // 48 | dec eax // 7428 | je 0x2a condition: 7 of them and filesize < 155648 }
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