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rule win_zeroaccess_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.zeroaccess." 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.zeroaccess" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { ff15???????? 85c0 7408 ff15???????? eb02 } // n = 5, score = 300 // ff15???????? | // 85c0 | test eax, eax // 7408 | je 0xa // ff15???????? | // eb02 | jmp 4 $sequence_1 = { 56 56 6a20 6a05 } // n = 4, score = 200 // 56 | push esi // 56 | push esi // 6a20 | push 0x20 // 6a05 | push 5 $sequence_2 = { bf03000040 eb05 bf010000c0 85ff } // n = 4, score = 200 // bf03000040 | mov edi, 0x40000003 // eb05 | jmp 7 // bf010000c0 | mov edi, 0xc0000001 // 85ff | test edi, edi $sequence_3 = { 6a01 8d45f4 50 ff7308 ff15???????? 85c0 } // n = 6, score = 200 // 6a01 | push 1 // 8d45f4 | lea eax, [ebp - 0xc] // 50 | push eax // ff7308 | push dword ptr [ebx + 8] // ff15???????? | // 85c0 | test eax, eax $sequence_4 = { 6a04 68???????? 6a10 68???????? 68060000c8 ff7708 ff15???????? } // n = 7, score = 200 // 6a04 | push 4 // 68???????? | // 6a10 | push 0x10 // 68???????? | // 68060000c8 | push 0xc8000006 // ff7708 | push dword ptr [edi + 8] // ff15???????? | $sequence_5 = { ff15???????? 85c0 7407 b8e3030000 } // n = 4, score = 200 // ff15???????? | // 85c0 | test eax, eax // 7407 | je 9 // b8e3030000 | mov eax, 0x3e3 $sequence_6 = { 56 6a10 8945e8 8d45e4 } // n = 4, score = 200 // 56 | push esi // 6a10 | push 0x10 // 8945e8 | mov dword ptr [ebp - 0x18], eax // 8d45e4 | lea eax, [ebp - 0x1c] $sequence_7 = { e8???????? 50 6819000200 8d45f8 } // n = 4, score = 200 // e8???????? | // 50 | push eax // 6819000200 | push 0x20019 // 8d45f8 | lea eax, [ebp - 8] $sequence_8 = { 3bc1 7604 83c8ff c3 } // n = 4, score = 200 // 3bc1 | cmp eax, ecx // 7604 | jbe 6 // 83c8ff | or eax, 0xffffffff // c3 | ret $sequence_9 = { 50 68???????? 6889001200 8d45fc } // n = 4, score = 200 // 50 | push eax // 68???????? | // 6889001200 | push 0x120089 // 8d45fc | lea eax, [ebp - 4] $sequence_10 = { 56 8d45f8 50 ff15???????? 6a01 8d45f8 50 } // n = 7, score = 200 // 56 | push esi // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // ff15???????? | // 6a01 | push 1 // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax $sequence_11 = { 33c0 48 83c9ff c744242804000000 48 } // n = 5, score = 200 // 33c0 | xor eax, eax // 48 | dec eax // 83c9ff | or ecx, 0xffffffff // c744242804000000 | mov dword ptr [esp + 0x28], 4 // 48 | dec eax $sequence_12 = { 85db 741f 8b4304 49 } // n = 4, score = 100 // 85db | test ebx, ebx // 741f | je 0x21 // 8b4304 | mov eax, dword ptr [ebx + 4] // 49 | dec ecx $sequence_13 = { 7615 83780815 750f c705????????01000000 } // n = 4, score = 100 // 7615 | jbe 0x17 // 83780815 | cmp dword ptr [eax + 8], 0x15 // 750f | jne 0x11 // c705????????01000000 | $sequence_14 = { 48 83ec20 41 8bf9 48 8bd9 } // n = 6, score = 100 // 48 | dec eax // 83ec20 | sub esp, 0x20 // 41 | inc ecx // 8bf9 | mov edi, ecx // 48 | dec eax // 8bd9 | mov ebx, ecx condition: 7 of them and filesize < 172032 }
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