TTP_RegOpenKeyExA_HKEY_PERFORMANCE_DATA_loose

YARA detection rule by @captainGeech42,@stvemillertime,@greglesnewich · GPL-2.0

Look for PE files that try to open HKEY_PERFORMANCE_DATA keys (const 0x80000004) with RegOpenKeyExA

import "pe"
rule TTP_RegOpenKeyExA_HKEY_PERFORMANCE_DATA_loose {
    meta:
        author = "@captainGeech42,@stvemillertime,@greglesnewich"
        description = "Look for PE files that try to open HKEY_PERFORMANCE_DATA keys (const 0x80000004) with RegOpenKeyExA"
        reference = "https://learn.microsoft.com/en-us/windows/win32/sysinfo/predefined-keys"
        date = "2024-01-27"
        version = "1"
        DaysofYARA = "27/100"
    strings:

        $reg_open_key_call = {04 00 00 80 [1-20] ff 15}
    condition:
        uint16be(0) == 0x4d5a and (
            $reg_open_key_call and
            for any i in (1..#reg_open_key_call): (
            for any imp in pe.import_details : (
                imp.library_name == "ADVAPI32.dll" and
                for any func in imp.functions : (
                    func.name == "RegOpenKeyExA" and
                    uint32(@reg_open_key_call[i]+!reg_open_key_call[i])&0xfffff == func.rva                     )
                )
            )
        )
}

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

1e0068bb-b7b9-42d8-a1f9-e7ce663aead5

Propose edits, view related rules, and engage with the community through comments.

Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

[[ reason ]]

What does this mean?

Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

[[ reason ]]

What do these messages mean?

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

Community Discussion