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rule win_zupdax_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.zupdax." 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.zupdax" 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 = { 8b4c2408 8b7e28 51 e8???????? 8b5624 52 e8???????? } // n = 7, score = 300 // 8b4c2408 | mov ecx, dword ptr [esp + 8] // 8b7e28 | mov edi, dword ptr [esi + 0x28] // 51 | push ecx // e8???????? | // 8b5624 | mov edx, dword ptr [esi + 0x24] // 52 | push edx // e8???????? | $sequence_1 = { 30142f 47 3b7c2418 72a7 5b 5f 5e } // n = 7, score = 300 // 30142f | xor byte ptr [edi + ebp], dl // 47 | inc edi // 3b7c2418 | cmp edi, dword ptr [esp + 0x18] // 72a7 | jb 0xffffffa9 // 5b | pop ebx // 5f | pop edi // 5e | pop esi $sequence_2 = { 83e902 f7d9 1bc9 83e10c } // n = 4, score = 300 // 83e902 | sub ecx, 2 // f7d9 | neg ecx // 1bc9 | sbb ecx, ecx // 83e10c | and ecx, 0xc $sequence_3 = { 6a00 51 e8???????? 83c418 8bc6 c3 } // n = 6, score = 300 // 6a00 | push 0 // 51 | push ecx // e8???????? | // 83c418 | add esp, 0x18 // 8bc6 | mov eax, esi // c3 | ret $sequence_4 = { 8d542448 52 68???????? ff15???????? 8d442444 83c0fe 668b4802 } // n = 7, score = 300 // 8d542448 | lea edx, [esp + 0x48] // 52 | push edx // 68???????? | // ff15???????? | // 8d442444 | lea eax, [esp + 0x44] // 83c0fe | add eax, -2 // 668b4802 | mov cx, word ptr [eax + 2] $sequence_5 = { 68???????? ff15???????? 8d442444 83c0fe 668b4802 83c002 } // n = 6, score = 300 // 68???????? | // ff15???????? | // 8d442444 | lea eax, [esp + 0x44] // 83c0fe | add eax, -2 // 668b4802 | mov cx, word ptr [eax + 2] // 83c002 | add eax, 2 $sequence_6 = { 83c40c 6a00 8d4c2404 51 ff15???????? } // n = 5, score = 300 // 83c40c | add esp, 0xc // 6a00 | push 0 // 8d4c2404 | lea ecx, [esp + 4] // 51 | push ecx // ff15???????? | $sequence_7 = { c74604ffffffff e8???????? 68c8000000 8d4e7c } // n = 4, score = 300 // c74604ffffffff | mov dword ptr [esi + 4], 0xffffffff // e8???????? | // 68c8000000 | push 0xc8 // 8d4e7c | lea ecx, [esi + 0x7c] $sequence_8 = { 8b460c 83c404 3bc3 7419 } // n = 4, score = 300 // 8b460c | mov eax, dword ptr [esi + 0xc] // 83c404 | add esp, 4 // 3bc3 | cmp eax, ebx // 7419 | je 0x1b $sequence_9 = { 8b15???????? a1???????? 668b0d???????? 68f6000000 } // n = 4, score = 300 // 8b15???????? | // a1???????? | // 668b0d???????? | // 68f6000000 | push 0xf6 condition: 7 of them and filesize < 1032192 }
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