OSSEC / HIDS Rule 1003

OSSEC / HIDS rule catalog

• Rule family: OSSEC / HIDS
• Rule ID: 1003
• Definition status: Present in current source
• Alert message / subject: Non standard syslog message (size too large).
• Rule level: 13
• Definition checked: 2026-10-21

Interpretation and response

This rule identifies an unusually large syslog message. Investigate malfunctioning applications, excessive logging and potentially malicious input.

An OSSEC/HIDS event records or correlates activity. Blocking depends on the originating application and any separately configured Active Response policy; an alert alone does not prove that an attack was blocked.

The current definition uses a maximum-size attribute of 8192; the historical 1025-character threshold is obsolete. Compare the installed rule and manager behavior.

Documentation

The following guidance was migrated from the historical wiki and reviewed against the rule definition. Legacy ASL product names and interface instructions refer to the versions documented then. Use the current metadata above and your installed configuration when interpreting thresholds, notification settings and response behavior.

Rule ID

1003

Status

The wiki marked this rule Active at the source revision. Current definition status is shown above.

Description

This rule identifies an unusually large syslog message. Investigate malfunctioning applications, excessive logging and potentially malicious input.

False Positives

Review the event and expected administrative activity. The earlier instructions under this heading applied to the historical description; use the current interpretation above.

Tuning Recommendations

None.

Source and revision

Migrated from HIDS_1003, wiki page 209, revision 1778 (20110728). Documentation review: 2026-10-21. An archived wiki status of Active is not a current deployment status.

For assistance, provide the rule ID, installed product and rule version, and a sanitized event to Atomicorp support .