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rule win_zeroaccess_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { eb02 33c0 8d65b8 5f 5e 5b } // n = 6, score = 200 // eb02 | jmp 4 // 33c0 | xor eax, eax // 8d65b8 | lea esp, dword ptr [ebp - 0x48] // 5f | pop edi // 5e | pop esi // 5b | pop ebx $sequence_2 = { 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_3 = { 50 6a01 8d45f4 50 ff7608 } // n = 5, score = 200 // 50 | push eax // 6a01 | push 1 // 8d45f4 | lea eax, dword ptr [ebp - 0xc] // 50 | push eax // ff7608 | push dword ptr [esi + 8] $sequence_4 = { 68???????? 68060000c8 ff7708 ff15???????? } // n = 4, score = 200 // 68???????? | // 68060000c8 | push 0xc8000006 // ff7708 | push dword ptr [edi + 8] // ff15???????? | $sequence_5 = { 57 6a02 68???????? ff75f8 } // n = 4, score = 200 // 57 | push edi // 6a02 | push 2 // 68???????? | // ff75f8 | push dword ptr [ebp - 8] $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, dword ptr [ebp - 0x1c] $sequence_7 = { 8bf4 2bfe 8d45fc 50 57 } // n = 5, score = 200 // 8bf4 | mov esi, esp // 2bfe | sub edi, esi // 8d45fc | lea eax, dword ptr [ebp - 4] // 50 | push eax // 57 | push edi $sequence_8 = { 740c bf03000040 eb05 bf010000c0 85ff } // n = 5, score = 200 // 740c | je 0xe // bf03000040 | mov edi, 0x40000003 // eb05 | jmp 7 // bf010000c0 | mov edi, 0xc0000001 // 85ff | test edi, edi $sequence_9 = { 3bc1 7604 83c8ff c3 } // n = 4, score = 200 // 3bc1 | cmp eax, ecx // 7604 | jbe 6 // 83c8ff | or eax, 0xffffffff // c3 | ret $sequence_10 = { ff15???????? 85c0 7407 b8e3030000 } // n = 4, score = 200 // ff15???????? | // 85c0 | test eax, eax // 7407 | je 9 // b8e3030000 | mov eax, 0x3e3 $sequence_11 = { 750f c705????????01000000 bb01000000 48 8b4d18 ff15???????? } // n = 6, score = 100 // 750f | jne 0x11 // c705????????01000000 | // bb01000000 | mov ebx, 1 // 48 | dec eax // 8b4d18 | mov ecx, dword ptr [ebp + 0x18] // ff15???????? | $sequence_12 = { 8bcb e8???????? 85c0 756e 8d6840 } // n = 5, score = 100 // 8bcb | mov ecx, ebx // e8???????? | // 85c0 | test eax, eax // 756e | jne 0x70 // 8d6840 | lea ebp, dword ptr [eax + 0x40] $sequence_13 = { 8d4d67 41 b808000000 48 8bd7 } // n = 5, score = 100 // 8d4d67 | lea ecx, dword ptr [ebp + 0x67] // 41 | inc ecx // b808000000 | mov eax, 8 // 48 | dec eax // 8bd7 | mov edx, edi condition: 7 of them and filesize < 172032 }
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