There is no description at this point.
rule win_zeroaccess_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 85c0 7408 ff15???????? eb02 } // n = 4, score = 300 // 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 = { 8b01 ff761c ff7618 ff5004 } // n = 4, score = 200 // 8b01 | mov eax, dword ptr [ecx] // ff761c | push dword ptr [esi + 0x1c] // ff7618 | push dword ptr [esi + 0x18] // ff5004 | call dword ptr [eax + 4] $sequence_4 = { c3 8d4104 83caff f00fc110 750a 85c9 } // n = 6, score = 200 // c3 | ret // 8d4104 | lea eax, [ecx + 4] // 83caff | or edx, 0xffffffff // f00fc110 | lock xadd dword ptr [eax], edx // 750a | jne 0xc // 85c9 | test ecx, ecx $sequence_5 = { 8bf4 2bfe 8d45fc 50 57 56 } // n = 6, score = 200 // 8bf4 | mov esi, esp // 2bfe | sub edi, esi // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // 57 | push edi // 56 | push esi $sequence_6 = { 3bc1 7604 83c8ff c3 } // n = 4, score = 200 // 3bc1 | cmp eax, ecx // 7604 | jbe 6 // 83c8ff | or eax, 0xffffffff // c3 | ret $sequence_7 = { 68???????? 6a10 68???????? 68060000c8 ff7708 ff15???????? } // n = 6, score = 200 // 68???????? | // 6a10 | push 0x10 // 68???????? | // 68060000c8 | push 0xc8000006 // ff7708 | push dword ptr [edi + 8] // ff15???????? | $sequence_8 = { 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_9 = { 3bf8 730e 2bc7 e8???????? } // n = 4, score = 200 // 3bf8 | cmp edi, eax // 730e | jae 0x10 // 2bc7 | sub eax, edi // e8???????? | $sequence_10 = { ff15???????? 85c0 7407 b8e3030000 } // n = 4, score = 200 // ff15???????? | // 85c0 | test eax, eax // 7407 | je 9 // b8e3030000 | mov eax, 0x3e3 $sequence_11 = { 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_12 = { 48 8d4c2460 c744247030000000 48 897c2478 48 } // n = 6, score = 100 // 48 | dec eax // 8d4c2460 | lea ecx, [esp + 0x60] // c744247030000000 | mov dword ptr [esp + 0x70], 0x30 // 48 | dec eax // 897c2478 | mov dword ptr [esp + 0x78], edi // 48 | dec eax $sequence_13 = { 4c 8bc8 48 85c0 0f84e6000000 44 8b442460 } // n = 7, score = 100 // 4c | dec esp // 8bc8 | mov ecx, eax // 48 | dec eax // 85c0 | test eax, eax // 0f84e6000000 | je 0xec // 44 | inc esp // 8b442460 | mov eax, dword ptr [esp + 0x60] $sequence_14 = { 4d 85c9 7404 41 832100 45 85c0 } // n = 7, score = 100 // 4d | dec ebp // 85c9 | test ecx, ecx // 7404 | je 6 // 41 | inc ecx // 832100 | and dword ptr [ecx], 0 // 45 | inc ebp // 85c0 | test eax, eax condition: 7 of them and filesize < 172032 }
If your designated proposal does not fit in any other category, feel free to write a free-text in the comment field below.
Please propose all changes regarding references on the Malpedia library page
Your suggestion will be reviewed before being published. Thank you for contributing!
YYYY-MM-DD
YYYY-MM
YYYY