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rule win_zeroaccess_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "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 = { 85c0 7408 ff15???????? eb02 } // n = 4, score = 300 // 85c0 | test eax, eax // 7408 | je 0xa // ff15???????? | // eb02 | jmp 4 $sequence_1 = { e8???????? 50 6819000200 8d45f8 50 ff15???????? } // n = 6, score = 200 // e8???????? | // 50 | push eax // 6819000200 | push 0x20019 // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // ff15???????? | $sequence_2 = { 6a04 68???????? 6a10 68???????? 68060000c8 ff7708 } // n = 6, score = 200 // 6a04 | push 4 // 68???????? | // 6a10 | push 0x10 // 68???????? | // 68060000c8 | push 0xc8000006 // ff7708 | push dword ptr [edi + 8] $sequence_3 = { 6a10 8945e8 8d45e4 50 } // n = 4, score = 200 // 6a10 | push 0x10 // 8945e8 | mov dword ptr [ebp - 0x18], eax // 8d45e4 | lea eax, [ebp - 0x1c] // 50 | push eax $sequence_4 = { 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_5 = { 3bc1 7604 83c8ff c3 } // n = 4, score = 200 // 3bc1 | cmp eax, ecx // 7604 | jbe 6 // 83c8ff | or eax, 0xffffffff // c3 | ret $sequence_6 = { 8d45fc 50 6a01 8d45f4 50 ff7608 ff15???????? } // n = 7, score = 200 // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // 6a01 | push 1 // 8d45f4 | lea eax, [ebp - 0xc] // 50 | push eax // ff7608 | push dword ptr [esi + 8] // ff15???????? | $sequence_7 = { ff15???????? 85c0 7407 b8e3030000 } // n = 4, score = 200 // ff15???????? | // 85c0 | test eax, eax // 7407 | je 9 // b8e3030000 | mov eax, 0x3e3 $sequence_8 = { 48 83c9ff c744242804000000 48 } // n = 4, score = 200 // 48 | dec eax // 83c9ff | or ecx, 0xffffffff // c744242804000000 | mov dword ptr [esp + 0x28], 4 // 48 | dec eax $sequence_9 = { 68???????? 6889001200 8d45fc 50 } // n = 4, score = 200 // 68???????? | // 6889001200 | push 0x120089 // 8d45fc | lea eax, [ebp - 4] // 50 | push eax $sequence_10 = { ff15???????? 6a01 8d45f8 50 57 ff15???????? } // n = 6, score = 200 // ff15???????? | // 6a01 | push 1 // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // 57 | push edi // ff15???????? | $sequence_11 = { b802000000 48 8d542420 6689442420 33c0 6689742422 48 } // n = 7, score = 100 // b802000000 | mov eax, 2 // 48 | dec eax // 8d542420 | lea edx, [esp + 0x20] // 6689442420 | mov word ptr [esp + 0x20], ax // 33c0 | xor eax, eax // 6689742422 | mov word ptr [esp + 0x22], si // 48 | dec eax $sequence_12 = { 8364247000 33c0 8bfb 4c 8d4c2478 48 8d542470 } // n = 7, score = 100 // 8364247000 | and dword ptr [esp + 0x70], 0 // 33c0 | xor eax, eax // 8bfb | mov edi, ebx // 4c | dec esp // 8d4c2478 | lea ecx, [esp + 0x78] // 48 | dec eax // 8d542470 | lea edx, [esp + 0x70] $sequence_13 = { 3925???????? 48 8b0d???????? 740d 45 33c0 } // n = 6, score = 100 // 3925???????? | // 48 | dec eax // 8b0d???????? | // 740d | je 0xf // 45 | inc ebp // 33c0 | xor eax, eax condition: 7 of them and filesize < 172032 }
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