contains_base64

YARA detection rule by Jaume Martin · GPL-2.0

This rule finds for base64 strings

rule contains_base64 : Base64
{
    meta:
        author = "Jaume Martin"
        description = "This rule finds for base64 strings"
        version = "0.2"
        notes = "https://github.com/Yara-Rules/rules/issues/153"
    strings:
        $a = /([A-Za-z0-9+\/]{4}){3,}([A-Za-z0-9+\/]{2}==|[A-Za-z0-9+\/]{3}=)?/
    condition:
        $a
}

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

bd11059e-5288-4526-855c-c3d6e9dab238

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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 ]]

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