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rule win_gup_proxy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 68???????? 8d0c45dc984100 8bc1 2d???????? } // n = 4, score = 100 // 68???????? | // 8d0c45dc984100 | lea ecx, [eax*2 + 0x4198dc] // 8bc1 | mov eax, ecx // 2d???????? | $sequence_1 = { c785e0f5ffff01000000 ff15???????? 8b3d???????? 8da42400000000 8b06 8985f0f6ffff 8985e8f5ffff } // n = 7, score = 100 // c785e0f5ffff01000000 | mov dword ptr [ebp - 0xa20], 1 // ff15???????? | // 8b3d???????? | // 8da42400000000 | lea esp, [esp] // 8b06 | mov eax, dword ptr [esi] // 8985f0f6ffff | mov dword ptr [ebp - 0x910], eax // 8985e8f5ffff | mov dword ptr [ebp - 0xa18], eax $sequence_2 = { f30f7f851cfbffff 660f6f05???????? f30f7f852cfbffff 660f6f05???????? f30f7f853cfbffff } // n = 5, score = 100 // f30f7f851cfbffff | movdqu xmmword ptr [ebp - 0x4e4], xmm0 // 660f6f05???????? | // f30f7f852cfbffff | movdqu xmmword ptr [ebp - 0x4d4], xmm0 // 660f6f05???????? | // f30f7f853cfbffff | movdqu xmmword ptr [ebp - 0x4c4], xmm0 $sequence_3 = { 2b45fc 83c010 894df8 03c2 394710 7549 } // n = 6, score = 100 // 2b45fc | sub eax, dword ptr [ebp - 4] // 83c010 | add eax, 0x10 // 894df8 | mov dword ptr [ebp - 8], ecx // 03c2 | add eax, edx // 394710 | cmp dword ptr [edi + 0x10], eax // 7549 | jne 0x4b $sequence_4 = { c74424580f000000 c744245400000000 c644244400 720c ff74242c e8???????? } // n = 6, 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] // e8???????? | $sequence_5 = { c745f4741f4100 50 e8???????? cc } // n = 4, score = 100 // c745f4741f4100 | mov dword ptr [ebp - 0xc], 0x411f74 // 50 | push eax // e8???????? | // cc | int3 $sequence_6 = { 8bd8 895c2420 83fbff 743c b802000000 } // n = 5, score = 100 // 8bd8 | mov ebx, eax // 895c2420 | mov dword ptr [esp + 0x20], ebx // 83fbff | cmp ebx, -1 // 743c | je 0x3e // b802000000 | mov eax, 2 $sequence_7 = { 8d858cfeffff 6868010000 50 e8???????? 83c418 c7461000000000 } // n = 6, score = 100 // 8d858cfeffff | lea eax, [ebp - 0x174] // 6868010000 | push 0x168 // 50 | push eax // e8???????? | // 83c418 | add esp, 0x18 // c7461000000000 | mov dword ptr [esi + 0x10], 0 $sequence_8 = { ff36 ff15???????? 83f801 7c1a 0103 8b8ddcf5ffff 50 } // n = 7, score = 100 // ff36 | push dword ptr [esi] // ff15???????? | // 83f801 | cmp eax, 1 // 7c1a | jl 0x1c // 0103 | add dword ptr [ebx], eax // 8b8ddcf5ffff | mov ecx, dword ptr [ebp - 0xa24] // 50 | push eax $sequence_9 = { 8944241c c74424480f000000 c744244400000000 c644243400 } // n = 4, score = 100 // 8944241c | mov dword ptr [esp + 0x1c], eax // c74424480f000000 | mov dword ptr [esp + 0x48], 0xf // c744244400000000 | mov dword ptr [esp + 0x44], 0 // c644243400 | mov byte ptr [esp + 0x34], 0 condition: 7 of them and filesize < 247808 }
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