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rule win_gup_proxy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.gup_proxy." 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.gup_proxy" 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 = { f30f7f855cfdffff 660f6f05???????? f30f7f856cfdffff 660f6f05???????? f30f7f857cfdffff } // n = 5, score = 100 // f30f7f855cfdffff | movdqu xmmword ptr [ebp - 0x2a4], xmm0 // 660f6f05???????? | // f30f7f856cfdffff | movdqu xmmword ptr [ebp - 0x294], xmm0 // 660f6f05???????? | // f30f7f857cfdffff | movdqu xmmword ptr [ebp - 0x284], xmm0 $sequence_1 = { 8bfe 83e71f c1e706 8b049d10974100 0fbe443804 83e001 } // n = 6, score = 100 // 8bfe | mov edi, esi // 83e71f | and edi, 0x1f // c1e706 | shl edi, 6 // 8b049d10974100 | mov eax, dword ptr [ebx*4 + 0x419710] // 0fbe443804 | movsx eax, byte ptr [eax + edi + 4] // 83e001 | and eax, 1 $sequence_2 = { 660fd60f 8d7f08 8b048df83c4000 ffe0 } // n = 4, score = 100 // 660fd60f | movq qword ptr [edi], xmm1 // 8d7f08 | lea edi, [edi + 8] // 8b048df83c4000 | mov eax, dword ptr [ecx*4 + 0x403cf8] // ffe0 | jmp eax $sequence_3 = { 0fb6cf 8db5fcf9ffff 03f1 8a1e 8acb 02cf } // n = 6, score = 100 // 0fb6cf | movzx ecx, bh // 8db5fcf9ffff | lea esi, [ebp - 0x604] // 03f1 | add esi, ecx // 8a1e | mov bl, byte ptr [esi] // 8acb | mov cl, bl // 02cf | add cl, bh $sequence_4 = { 8d85e4f5ffff c785ecf6ffff01000000 50 6a00 8d85ecf6ffff c785e4f5ffff01000000 } // n = 6, score = 100 // 8d85e4f5ffff | lea eax, [ebp - 0xa1c] // c785ecf6ffff01000000 | mov dword ptr [ebp - 0x914], 1 // 50 | push eax // 6a00 | push 0 // 8d85ecf6ffff | lea eax, [ebp - 0x914] // c785e4f5ffff01000000 | mov dword ptr [ebp - 0xa1c], 1 $sequence_5 = { 0fb6420e 03c8 0fb6420d c1e108 } // n = 4, score = 100 // 0fb6420e | movzx eax, byte ptr [edx + 0xe] // 03c8 | add ecx, eax // 0fb6420d | movzx eax, byte ptr [edx + 0xd] // c1e108 | shl ecx, 8 $sequence_6 = { 668944245e 8d44245c 6a10 50 53 ff15???????? } // n = 6, score = 100 // 668944245e | mov word ptr [esp + 0x5e], ax // 8d44245c | lea eax, [esp + 0x5c] // 6a10 | push 0x10 // 50 | push eax // 53 | push ebx // ff15???????? | $sequence_7 = { 50 8bce e8???????? 6a04 8d8588feffff c78588feffffc22eab48 } // n = 6, score = 100 // 50 | push eax // 8bce | mov ecx, esi // e8???????? | // 6a04 | push 4 // 8d8588feffff | lea eax, [ebp - 0x178] // c78588feffffc22eab48 | mov dword ptr [ebp - 0x178], 0x48ab2ec2 $sequence_8 = { c745f4741f4100 50 e8???????? cc 55 8bec } // n = 6, score = 100 // c745f4741f4100 | mov dword ptr [ebp - 0xc], 0x411f74 // 50 | push eax // e8???????? | // cc | int3 // 55 | push ebp // 8bec | mov ebp, esp $sequence_9 = { 8bcf 8bc7 894de4 399898874100 0f84e8000000 41 83c030 } // n = 7, score = 100 // 8bcf | mov ecx, edi // 8bc7 | mov eax, edi // 894de4 | mov dword ptr [ebp - 0x1c], ecx // 399898874100 | cmp dword ptr [eax + 0x418798], ebx // 0f84e8000000 | je 0xee // 41 | inc ecx // 83c030 | add eax, 0x30 condition: 7 of them and filesize < 247808 }
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