In the world of cybersecurity, defenders are constantly on the lookout for suspicious activity that could indicate a security breach. One common tactic used by attackers is lateral movement through Remote Desktop Protocol (RDP). While defenders may be familiar with detecting these suspicious RDP connections based on known-compromised users or alerts from security tools, what comes next after detecting the initial signs of trouble?
One technique that defenders can use to further investigate suspicious RDP connections is examining the logs for account-activity timestamps. By analyzing the time zone bias of the machine making the connection, defenders can identify deviations from the expected behavior of users. For example, if a user like James, who is based in London, suddenly shows a time zone bias that is different from the norm, it could indicate a potentially suspicious RDP connection.
Event ID 104, available in modern versions of Microsoft’s operating system, captures the time zone bias of the machine making the RDP connection. This information can help defenders identify unusual connections that may warrant further investigation. However, attackers can also manipulate this data by changing the time zone on their machine, leading to potential false negatives in the investigation.
To assist defenders in monitoring and analyzing RDP connections, tools like Sophos’ Live Discover provide queries that can extract timezone bias information from event logs. By running these queries, defenders can identify discrepancies in time zones between different events, which may indicate suspicious activity. While there is no one-size-fits-all solution to detecting malicious RDP connections, leveraging tools like Event ID 104 and Live Discover can provide valuable insights for defenders in their cybersecurity efforts. # Investigating Time Zone Bias in Remote Desktop Protocol
## Introduction
In the world of cybersecurity, understanding and monitoring Remote Desktop Protocol (RDP) activity is crucial to maintaining a secure environment. One often overlooked aspect of RDP investigation is the presence of time zone bias entries in the RDP Core TS Operational event log. These entries can indicate potential anomalies or suspicious activities that need to be further investigated.
## Identifying Time Zone Bias Entries
It is recommended to execute queries across all devices within your environment to identify any discrepancies in time zone bias entries in the RDP Core TS Operational event log. These entries may differ from what is typically expected, which could be a red flag for unauthorized access or malicious activity.
## Remote Desktop Protocol: The Series
This article is part of a series dedicated to exploring various aspects of Remote Desktop Protocol. From introduction to executing external queries, each part delves deeper into the world of RDP and provides valuable insights for cybersecurity professionals.
– Part 1: Remote Desktop Protocol: Introduction
– Part 2: Remote Desktop Protocol: Exposed RDP (is dangerous)
– Part 3: RDP: Queries for Investigation
– Part 4: RDP Time Zone Bias (current)
– Part 5: Executing the External RDP Query
– Part 6: Executing the 4624_4625 Login Query
## Key Points
– Time zone bias entries in RDP Core TS Operational event log can indicate anomalies.
– Executing queries across all devices can help identify suspicious activities.
– Understanding RDP activity is crucial for maintaining a secure environment.
## Summary
Investigating time zone bias in Remote Desktop Protocol is an essential part of cybersecurity monitoring. By identifying and analyzing discrepancies in time zone entries, security professionals can uncover potential threats and take appropriate action to mitigate risks. Stay tuned for more insights and tips in the ongoing series on Remote Desktop Protocol.