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rule win_gup_proxy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 8d442424 50 687e660480 57 } // n = 4, score = 100 // 8d442424 | lea eax, [esp + 0x24] // 50 | push eax // 687e660480 | push 0x8004667e // 57 | push edi $sequence_1 = { 8b4d08 33c0 3b0cc528804100 7427 40 } // n = 5, score = 100 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 33c0 | xor eax, eax // 3b0cc528804100 | cmp ecx, dword ptr [eax*8 + 0x418028] // 7427 | je 0x29 // 40 | inc eax $sequence_2 = { 8b0c8d10974100 c644390400 85f6 740c 56 e8???????? 59 } // n = 7, score = 100 // 8b0c8d10974100 | mov ecx, dword ptr [ecx*4 + 0x419710] // c644390400 | mov byte ptr [ecx + edi + 4], 0 // 85f6 | test esi, esi // 740c | je 0xe // 56 | push esi // e8???????? | // 59 | pop ecx $sequence_3 = { 83c10c 8b048510974100 03c1 50 } // n = 4, score = 100 // 83c10c | add ecx, 0xc // 8b048510974100 | mov eax, dword ptr [eax*4 + 0x419710] // 03c1 | add eax, ecx // 50 | push eax $sequence_4 = { c7461000000000 837e1410 7204 8b0e eb02 8bce } // n = 6, score = 100 // c7461000000000 | mov dword ptr [esi + 0x10], 0 // 837e1410 | cmp dword ptr [esi + 0x14], 0x10 // 7204 | jb 6 // 8b0e | mov ecx, dword ptr [esi] // eb02 | jmp 4 // 8bce | mov ecx, esi $sequence_5 = { c1e706 8b0c8d10974100 c644390400 85f6 740c 56 e8???????? } // n = 7, score = 100 // c1e706 | shl edi, 6 // 8b0c8d10974100 | mov ecx, dword ptr [ecx*4 + 0x419710] // c644390400 | mov byte ptr [ecx + edi + 4], 0 // 85f6 | test esi, esi // 740c | je 0xe // 56 | push esi // e8???????? | $sequence_6 = { c744245400000000 c644244400 720c ff74242c e8???????? 83c404 ff742414 } // n = 7, score = 100 // c744245400000000 | mov dword ptr [esp + 0x54], 0 // c644244400 | mov byte ptr [esp + 0x44], 0 // 720c | jb 0xe // ff74242c | push dword ptr [esp + 0x2c] // e8???????? | // 83c404 | add esp, 4 // ff742414 | push dword ptr [esp + 0x14] $sequence_7 = { c74424580f000000 c744245400000000 c644244400 720c ff74242c } // n = 5, score = 100 // c74424580f000000 | mov dword ptr [esp + 0x58], 0xf // c744245400000000 | mov dword ptr [esp + 0x54], 0 // c644244400 | mov byte ptr [esp + 0x44], 0 // 720c | jb 0xe // ff74242c | push dword ptr [esp + 0x2c] $sequence_8 = { 894de4 83f905 7d10 668b444b0c 6689044d5c9f4100 41 } // n = 6, score = 100 // 894de4 | mov dword ptr [ebp - 0x1c], ecx // 83f905 | cmp ecx, 5 // 7d10 | jge 0x12 // 668b444b0c | mov ax, word ptr [ebx + ecx*2 + 0xc] // 6689044d5c9f4100 | mov word ptr [ecx*2 + 0x419f5c], ax // 41 | inc ecx $sequence_9 = { 03d8 0fb6420e 03c8 0fb6420d c1e108 } // n = 5, score = 100 // 03d8 | add ebx, eax // 0fb6420e | movzx eax, byte ptr [edx + 0xe] // 03c8 | add ecx, eax // 0fb6420d | movzx eax, byte ptr [edx + 0xd] // c1e108 | shl ecx, 8 condition: 7 of them and filesize < 247808 }
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