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InformationalSplunk security contentTeoderick Contreras +1

Windows Anomalous Registry Value Length in Environment Key

The following analytic detects creation or modification of registry values under a user or system Environment key (paths matching *\Environment\*) where the stored value exceeds 2,000 characters. Legitimate…

Description

The following analytic detects creation or modification of registry values under a user or system Environment key (paths matching *\Environment\*) where the stored value exceeds 2,000 characters. Legitimate environment variables are typically short strings (paths, tokens, or flags); unusually long values can indicate adversaries or malware staging encoded payloads, bloated malicious PATH entries, or other data in a location that is loaded for every interactive session. This behavior has been observed in contexts such as .NET infostealer activity. Analysts should validate the writing process, value content, and whether the change aligns with trusted software deployment or administrative tasks.

Detection logic

Detection requirements

Platform
Windows

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Log source category
sysmon_eventid_13

Known benign triggers

  • No false positives have been identified at this time.

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