IT Forensics · Linux
Forensic analysis of wtmp and utmp files – analysing session data in detail
wtmp and utmp store structured records of user sessions, including the terminal, process ID, timestamp and, in some cases, the source address. Whilst utmp reflects the current session status, wtmp maintains a historical record.
The binary structure of these files requires the structured extraction of individual data records for a forensically verifiable analysis, rather than relying solely on textual summaries.
Why LanCologne?
Since its foundation, LanCologne has specialised in professional IT forensics. Our staff have decades of experience in the field of information technology and assist companies, solicitors, private individuals and, on a regular basis, the courts in the technical investigation of complex digital matters.
The examination is, as a matter of principle, carried out exclusively on a forensic copy, a forensic image or a data source captured in a technically equivalent manner that preserves the integrity of the evidence. The original evidence remains unchanged and is stored in a manner that preserves its integrity.
Our services
We extract individual session records from wtmp and utmp, use them to reconstruct the session duration and origin, and assign the results to the relevant user accounts and processes.
Typical areas of application
This is how a wtmp/utmp analysis works
Once backed up, the binary data records from wtmp and utmp are extracted in a structured manner and organised chronologically. The start and end times of sessions, as well as the processes involved, are documented and correlated with other system artefacts such as process lists and network connections.
Why is this analysis relevant from a forensic perspective?
Detailed meeting information allows for a more precise chronological reconstruction than a simple attendance list, particularly when examining meetings that take place simultaneously or over a longer period.
Combining wtmp and utmp data with process and network information allows for a more reliable assessment of which activities may actually have taken place during a particular session.
Frequently Asked Questions
LanCologne – Linux Forensics Cologne
Do you require a professional forensic investigation into „forensic analysis of wtmp and utmp files"? LanCologne can assist you with the legally admissible preservation of digital evidence and the traceable analysis of relevant Linux artefacts.
Related to this topic
- Forensic analysis of a btmp file – analysing failed login attempts
- Forensic analysis of SELinux audit logs – evaluating Mandatory Access Control events
- Forensic analysis of AppArmor logs – evaluating profile-based access controls
- Forensic Analysis of systemd-journald Logs – The Central Log Source for Modern Linux Systems