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rule win_gauss_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" version = "1" description = "Detects win.gauss." 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.gauss" malpedia_rule_date = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { e8???????? 894508 8945ec c645fc01 } // n = 4, score = 700 // e8???????? | // 894508 | mov dword ptr [ebp + 8], eax // 8945ec | mov dword ptr [ebp - 0x14], eax // c645fc01 | mov byte ptr [ebp - 4], 1 $sequence_1 = { 33db 895de4 66895dd4 895dfc c645fc01 } // n = 5, score = 700 // 33db | xor ebx, ebx // 895de4 | mov dword ptr [ebp - 0x1c], ebx // 66895dd4 | mov word ptr [ebp - 0x2c], bx // 895dfc | mov dword ptr [ebp - 4], ebx // c645fc01 | mov byte ptr [ebp - 4], 1 $sequence_2 = { 53 56 57 8965f0 8b7508 e8???????? } // n = 6, score = 700 // 53 | push ebx // 56 | push esi // 57 | push edi // 8965f0 | mov dword ptr [ebp - 0x10], esp // 8b7508 | mov esi, dword ptr [ebp + 8] // e8???????? | $sequence_3 = { 56 e8???????? 8bb080000000 e8???????? 8b4c2408 898880000000 8bc6 } // n = 7, score = 700 // 56 | push esi // e8???????? | // 8bb080000000 | mov esi, dword ptr [eax + 0x80] // e8???????? | // 8b4c2408 | mov ecx, dword ptr [esp + 8] // 898880000000 | mov dword ptr [eax + 0x80], ecx // 8bc6 | mov eax, esi $sequence_4 = { e8???????? c7442414ffffffff 8b4c240c 5f } // n = 4, score = 600 // e8???????? | // c7442414ffffffff | mov dword ptr [esp + 0x14], 0xffffffff // 8b4c240c | mov ecx, dword ptr [esp + 0xc] // 5f | pop edi $sequence_5 = { 7303 894508 837d0800 7653 8b4e18 83f908 53 } // n = 7, score = 600 // 7303 | jae 5 // 894508 | mov dword ptr [ebp + 8], eax // 837d0800 | cmp dword ptr [ebp + 8], 0 // 7653 | jbe 0x55 // 8b4e18 | mov ecx, dword ptr [esi + 0x18] // 83f908 | cmp ecx, 8 // 53 | push ebx $sequence_6 = { ff742408 8bf0 83661400 c7461807000000 6683660400 e8???????? } // n = 6, score = 600 // ff742408 | push dword ptr [esp + 8] // 8bf0 | mov esi, eax // 83661400 | and dword ptr [esi + 0x14], 0 // c7461807000000 | mov dword ptr [esi + 0x18], 7 // 6683660400 | and word ptr [esi + 4], 0 // e8???????? | $sequence_7 = { 6a01 e8???????? 59 c3 55 8bec 83ec14 } // n = 7, score = 600 // 6a01 | push 1 // e8???????? | // 59 | pop ecx // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 83ec14 | sub esp, 0x14 $sequence_8 = { e8???????? c7442410ffffffff 8b4c2408 8bc6 } // n = 4, score = 600 // e8???????? | // c7442410ffffffff | mov dword ptr [esp + 0x10], 0xffffffff // 8b4c2408 | mov ecx, dword ptr [esp + 8] // 8bc6 | mov eax, esi $sequence_9 = { 8b4004 eb03 83c004 6683244800 } // n = 4, score = 600 // 8b4004 | mov eax, dword ptr [eax + 4] // eb03 | jmp 5 // 83c004 | add eax, 4 // 6683244800 | and word ptr [eax + ecx*2], 0 $sequence_10 = { 8bf0 395e14 57 7305 e8???????? 8b7e14 } // n = 6, score = 600 // 8bf0 | mov esi, eax // 395e14 | cmp dword ptr [esi + 0x14], ebx // 57 | push edi // 7305 | jae 7 // e8???????? | // 8b7e14 | mov edi, dword ptr [esi + 0x14] $sequence_11 = { 83f808 7205 8b7604 eb03 83c604 66832600 } // n = 6, score = 600 // 83f808 | cmp eax, 8 // 7205 | jb 7 // 8b7604 | mov esi, dword ptr [esi + 4] // eb03 | jmp 5 // 83c604 | add esi, 4 // 66832600 | and word ptr [esi], 0 $sequence_12 = { cc 833e00 7505 e8???????? } // n = 4, score = 600 // cc | int3 // 833e00 | cmp dword ptr [esi], 0 // 7505 | jne 7 // e8???????? | $sequence_13 = { 83c604 66832600 33c0 3bc7 1bc0 } // n = 5, score = 600 // 83c604 | add esi, 4 // 66832600 | and word ptr [esi], 0 // 33c0 | xor eax, eax // 3bc7 | cmp eax, edi // 1bc0 | sbb eax, eax $sequence_14 = { b8???????? e8???????? 51 56 8d4508 8bf1 50 } // n = 7, score = 600 // b8???????? | // e8???????? | // 51 | push ecx // 56 | push esi // 8d4508 | lea eax, [ebp + 8] // 8bf1 | mov esi, ecx // 50 | push eax $sequence_15 = { c7462000000000 c6461000 c7442410ffffffff 8bce } // n = 4, score = 600 // c7462000000000 | mov dword ptr [esi + 0x20], 0 // c6461000 | mov byte ptr [esi + 0x10], 0 // c7442410ffffffff | mov dword ptr [esp + 0x10], 0xffffffff // 8bce | mov ecx, esi $sequence_16 = { ff7614 57 56 e8???????? eb18 } // n = 5, score = 600 // ff7614 | push dword ptr [esi + 0x14] // 57 | push edi // 56 | push esi // e8???????? | // eb18 | jmp 0x1a condition: 7 of them and filesize < 827392 }
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