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Description

The following analytic identifies a suspicious query on outlook credentials registry in Windows OS registry. typically refers to user profiles associated with Microsoft Outlook. Within this key, Outlook stores configuration settings, including account information such as email addresses, server details, and authentication credentials. Accessing or modifying this registry key can potentially compromise users' email security, making it a target for attackers seeking to steal sensitive information or execute unauthorized actions within Outlook. This anomaly detection is a good pivot to catch possible Trojan Stealer or RAT that tries to steal sensitive information to its targeted host.

  • Type: Anomaly

  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2024-02-14
  • Author: Teoderick Contreras, Splunk
  • ID: 36334123-077d-47a2-b70c-6c7b3cc85049

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1552 Unsecured Credentials Credential Access
Kill Chain Phase
  • Exploitation
NIST
  • DE.AE
CIS20
  • CIS 10
CVE 


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`wineventlog_security` EventCode=4663 object_file_path IN ("*\\Profiles\\Outlook\\9375CFF0413111d3B88A00104B2A6676*", "*\\Windows Messaging Subsystem\\Profiles\\9375CFF0413111d3B88A00104B2A6676*") AND process_name != *\\outlook.exe 
| stats count min(_time) as firstTime max(_time) as lastTime by object_file_name object_file_path process_name process_path  process_id EventCode dest 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `windows_unsecured_outlook_credentials_access_in_registry_filter`

Macros

The SPL above uses the following Macros:

:information_source: windows_unsecured_outlook_credentials_access_in_registry_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required fields

List of fields required to use this analytic.

  • _time
  • object_file_name
  • object_file_path
  • process_name
  • process_path
  • process_id
  • EventCode
  • dest

How To Implement

To successfully implement this search, you must ingest Windows Security Event logs and track event code 4663. For 4663, enable "Audit Object Access" in Group Policy. Then check the two boxes listed for both "Success" and "Failure."

Known False Positives

third party software may access this outlook registry.

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
49.0 70 70 A suspicious process $process_name$ accessing outlook credentials registry on $dest$

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

Reference

Test Dataset

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 | version: 1