Detection: Extended Period Without Successful Netbackup Backups

DEPRECATED DETECTION

This detection has been marked as deprecated by the Splunk Threat Research team. This means that it will no longer be maintained or supported. If you have any questions or concerns, please reach out to us at research@splunk.com.

Updated Date: 2024-10-17 ID: a34aae96-ccf8-4aef-952c-3ea214444440 Author: David Dorsey, Splunk Type: Hunting Product: Splunk Enterprise Security

Description

This search returns a list of hosts that have not successfully completed a backup in over a week. Deprecated because it's a infrastructure monitoring.

Search

1`netbackup` MESSAGE="Disk/Partition backup completed successfully." 
2| stats latest(_time) as latestTime by COMPUTERNAME 
3| `security_content_ctime(latestTime)` 
4| rename COMPUTERNAME as dest 
5| eval isOutlier=if(latestTime <= relative_time(now(), "-7d@d"), 1, 0) 
6| search isOutlier=1 
7| table latestTime, dest 
8| `extended_period_without_successful_netbackup_backups_filter`

Data Source

No data sources specified for this detection.

Macros Used

Name	Value
netbackup	`sourcetype="netbackup_logs"`
extended_period_without_successful_netbackup_backups_filter	`search *`

extended_period_without_successful_netbackup_backups_filter is an empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Annotations

- MITRE ATT&CK

+ Kill Chain Phases

+ NIST

+ CIS

- Threat Actors

ID	Technique	Tactic

NistCategory.DE_AE

Cis18Value.CIS_10

Default Configuration

This detection is configured by default in Splunk Enterprise Security to run with the following settings:

Setting	Value
Disabled	true
Cron Schedule	`0 * * * *`
Earliest Time	`-70m@m`
Latest Time	`-10m@m`
Schedule Window	`auto`
Creates Risk Event	False

This configuration file applies to all detections of type hunting.

Implementation

To successfully implement this search you need to first obtain data from your backup solution, either from the backup logs on your hosts, or from a central server responsible for performing the backups. If you do not use Netbackup, you can modify this search for your backup solution. Depending on how often you backup your systems, you may want to modify how far in the past to look for a successful backup, other than the default of seven days.

Known False Positives

None identified

Associated Analytic Story

Monitor Backup Solution

Risk Based Analytics (RBA)

Risk Message	Risk Score	Impact	Confidence
tbd	25	50	50

The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

Detection Testing

Test Type	Status	Dataset	Source	Sourcetype
Validation	Not Applicable	N/A	N/A	N/A
Unit	❌ Failing	N/A	`N/A`	`N/A`
Integration	❌ Failing	N/A	`N/A`	`N/A`

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

Source: GitHub | Version: 3