apt_uta0178_javascript_inclusion_strings

YARA detection rule by Sekoia.io · GPL-2.0

Detects UTA0178 malicious inclusion strings

rule apt_uta0178_javascript_inclusion_strings {
  meta:
    id             = "af816c35-1f00-47ea-86ee-c034607c625e"
    version        = "1.0"
    description    = "Detects UTA0178 malicious inclusion strings"
    author         = "Sekoia.io"
    creation_date  = "2024-01-12"
    classification = "TLP:CLEAR"

  strings:
    $s0 = ".value"
    $s1 = "btoa("
    $s2 = "https://"
    $s3 = "new XMLHttpRequest();"
    $s4 = ".send(null);"

  condition:
    @s0 < @s1 and
    @s1 < @s2 and
    @s2 < @s3 and
    @s3 < @s4 and
    @s4 - @s0 < 350
}

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

6f9fc865-a73a-4ec9-a546-934acc666df4

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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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