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Do not reboot, delete files, kill processes, or immediately reinstall. Treat an rkhunter or chkrootkit alert as an investigation trigger. Preserve evidence, stop trusting the suspected server’s tools, corroborate the alert from a clean environment, and escalate or rebuild if you cannot establish system integrity.
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First response: preserve evidence before changing the server
A rootkit warning can indicate a serious compromise, but scanners also flag legitimate changes and unusual yet harmless services. Your first objective is therefore evidence preservation, not cleanup. The Debian rkhunter README warns that logging in, killing processes, deleting files, powering down, rebooting, or installing software can alert an intruder or destroy evidence.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11- Record the alert exactly. Save the scanner name, date and time, test that failed, file or process named, command output, and the account that launched the scan. Copy raw output to storage that is not on the suspect server.
- Stop routine administration. Do not upgrade packages, run cleanup scripts, rotate logs, remove “hidden” files, or update a scanner’s baseline until the finding is explained.
- Notify the responsible team. On a company, school, or hosted game server, contact the designated security, systems, or incident-response team. Keep a written timeline of every action.
- Limit exposure without destroying volatile evidence. Follow your incident-response plan for network isolation. A firewall block or controlled quarantine may be safer than an abrupt shutdown, but the correct choice depends on whether you need live memory, network, or process evidence.
If you have no formal response plan, use a clean workstation for investigation and ask an experienced incident responder before making irreversible changes. Do not assume that a familiar shell, editor, ps, netstat, or package command on the suspect host is reporting truthfully.
Why a scanner warning is not a verdict
Both major scanners have important blind spots. rkhunter performs integrity and rootkit checks, records results in a log, and can use the distribution’s package manager for file-property checks. Its project documentation is for version 1.4.6. chkrootkit checks known signatures, processes, directories, network interfaces, and signs of log deletion; current project information lists version 0.59, released January 1, 2026.
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Known-signature tools can miss a new rootkit, a modified rootkit, or malware that has altered the scanner’s inputs. Conversely, a changed file, listening port, or interface mode can be benign. A single green scan does not prove a server is clean, and a single red line does not prove compromise. Confidence comes from independent evidence collected from a trusted environment.
Investigate from a trusted environment
Do not trust binaries on the suspect host
chkrootkit’s FAQ specifically warns that an attacker can modify rootkit sources to evade detection. Run it with a path containing trusted binaries using -p, or examine a compromised disk mounted beneath a trusted root directory with -r. In practice, boot or mount the server’s storage from trusted rescue media or attach it read-only to a clean analysis system, then point tools at that mounted filesystem. Keep the clean system off the suspect server’s trust chain.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesThe exact mounting and memory-acquisition procedure depends on your distribution, storage layout, encryption, and response policy. If preserving evidence matters, have a responder create forensic copies and capture volatile memory before powering off. Never improvise a write operation on the original disk when a forensic image is available.
Run chkrootkit with alternate paths when possible
After preparing trusted binaries or a mounted filesystem, run chkrootkit against that trusted context. Its expert mode, -x, displays suspicious strings for administrator inspection rather than treating every match as a final determination. Save the complete output, including tests that report “not infected,” and note which root directory and binary path were used.
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Run rkhunter, but preserve its raw log
From a trustworthy context, perform a full rkhunter check and retain the unedited output. Review /var/log/rkhunter.log when the log itself is still trustworthy; otherwise copy logs from the mounted filesystem and examine their timestamps and integrity on a clean machine. rkhunter can produce a warning-only report for triage, but a shortened report must not replace the full log. Do not run a baseline update merely to make warnings disappear.
Corroborate every finding
Verify files with the distribution package database
A file-property warning often follows a legitimate package upgrade. On Debian or Ubuntu systems, compare installed files with the package database using dpkg -V. On distributions using RPM, use rpm -V. These checks can identify changed size, checksum, permissions, ownership, or other metadata. Record the package name, expected version, and installed version before deciding whether the change is authorized.
An unexplained mismatch in a privileged executable, authentication component, kernel module, startup script, or security configuration deserves urgent escalation. A mismatch that exactly matches a documented package upgrade may be a false positive, but keep the evidence and verify the upgrade source and transaction logs before updating any scanner baseline.
Identify the owner of processes, ports, and files
A warning about a backdoor-associated port is not proof that a backdoor is present. Determine the owning PID, executable path, command line, service unit, listening address, and package that installed it from a trusted environment. Compare the service with your intended game-server, web, database, monitoring, or administration configuration. An unexpected privileged listener, an unknown binary outside package-managed paths, or a service that starts again after termination is substantially more concerning than a documented daemon on its normal port.
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Check persistence and log integrity
Look for unexplained scheduled jobs, systemd units, init scripts, shell startup files, SSH keys, kernel modules, library preload settings, container or orchestration hooks, and accounts with administrative privileges. Correlate file timestamps with package and deployment records. Treat gaps, truncation, inconsistent timestamps, or missing authentication and service logs as evidence of possible tampering, not as reassurance that nothing happened.
Common false-positive patterns
Changed file properties after an upgrade
Package upgrades can legitimately replace binaries, alter permissions, or change checksums. Confirm the transaction with dpkg -V or rpm -V, package-manager history, and the repository or image used for deployment. Only after the change is explained should you refresh an rkhunter baseline.
Promiscuous-mode network alerts
A DHCP client can place an interface in a mode that triggers a promiscuous-mode warning. Confirm the interface, DHCP process, network configuration, and owning package. An unexplained interface in that mode, especially alongside packet-capture tools or altered network services, requires deeper review.
Hidden-file warnings
Dotfiles are normal on Linux. Identify the file’s owner, location, permissions, content, package or deployment source, and modification time. A hidden file in a user’s home directory may be harmless; a hidden executable in a system path, loader directory, or startup location is more suspicious.
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Ports associated with historical backdoors
Port numbers alone are weak evidence. Map the listener to a PID and service, then verify its binary and package. A legitimate service can use a port historically associated with malware, while a malicious process can use any available port. Investigate the complete chain rather than the number in isolation.
When to escalate as a security incident
Move from local troubleshooting to incident handling immediately when any of these conditions applies:
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- A scanner reports a known rootkit or the result cannot be reproduced with trusted binaries.
- Package verification shows an unexplained change to a privileged file.
- Administrative persistence, an unknown privileged account, or a service that reappears after removal is unexplained.
- Authentication, audit, or scanner logs appear deleted, truncated, or tampered with.
- You cannot establish that the kernel, binaries, libraries, and startup path are trustworthy.
Preserve disk and memory evidence where feasible, move analysis to a clean workstation, and follow your organisation’s incident-response process. If the server handles player accounts, payment data, private keys, or other systems, include the relevant data-protection and credential-rotation procedures. Do not use the suspect host to generate new secrets.
Choosing the right verification approach
| Approach | Evidence preservation | Trust of execution environment | Coverage | Offline capability | Package-integrity verification | Logging | Independent corroboration |
|---|---|---|---|---|---|---|---|
| rkhunter | Can preserve detailed check output; running it on the live host can alter or expose activity | Limited if host binaries or kernel are compromised | Integrity and rootkit checks | Use from a trusted mounted system when practical | Can integrate package-manager file-property checks | Full log at /var/log/rkhunter.log; warning-only reporting is available |
Must be paired with another method |
| chkrootkit | Save raw output and avoid changing the original filesystem | Use trusted binaries with -p or a trusted root with -r |
Known signatures, processes, directories, interfaces, and log-deletion signs | Yes, against an offline mounted filesystem | Not a replacement for dpkg -V or rpm -V |
Output must be captured by the administrator | Needs package verification and another scanner |
| Package verification | Low impact when run against a copied or mounted filesystem | Strongest when package databases and binaries are read from trusted media | Files known to the distribution’s package database | Yes, with the filesystem mounted read-only | Direct comparison using dpkg -V or rpm -V |
Preserve command output and package transaction history | Does not detect every un-packaged or memory-only implant |
| Forensic response or rebuild | Best option for preserving and examining original evidence before eradication | Analysis occurs on clean systems and trusted media | Can include disk, memory, logs, persistence, and deployment records | Yes | Rebuild can restore a known-good package set, but evidence must be retained separately | Requires a documented chain of custody and timeline | Provides the strongest basis for an organisational incident decision |
Should you reboot?
Usually, not as your first action. A reboot can erase memory-resident evidence, trigger an intruder’s cleanup routine, or destroy information needed to understand the compromise. It may also be the wrong containment choice if the server is actively attacking other systems. Reboot only when your response plan or qualified responder determines that immediate containment outweighs the loss of volatile evidence, and document who authorized it.
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If the machine is unstable, causing harm, or cannot be isolated safely, an emergency shutdown may be necessary. Even then, preserve console output and available logs first, and avoid treating the resulting boot as proof of cleanliness.
When a rebuild is safer than cleanup
Ad hoc deletion is not eradication. A rootkit can replace commands, hide processes, persist in a kernel or boot component, and leave additional credentials behind. If independent checks agree, privileged changes remain unexplained, logs are compromised, or you cannot prove the integrity of the running system, plan eradication and rebuild from trusted media or a known-good image.
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- Revoke and rotate credentials that were present on the server, including SSH keys, deployment tokens, API keys, database passwords, and game-service secrets. Generate replacements on a clean machine.
- Build a new host from trusted installation media or a verified image. Apply updates before exposing services, and restore only reviewed data and configuration.
- Recreate services from documented manifests or packages instead of copying unknown executables and libraries from the old host.
- Review firewall rules, administrative access, monitoring, backups, and logging before reconnecting the server.
- Keep the original system isolated for the investigation and compare the rebuilt host against a known-good baseline.
A rebuild does not answer how the compromise occurred. Use preserved evidence and deployment records to close the initial access path, or the replacement server may be compromised in the same way.
A practical decision path
- One warning, no corroboration: preserve output, validate with trusted binaries, and check package records. Do not dismiss it or erase the baseline.
- Warning explained by an authorized change: document the change, retain the evidence, and update the scanner baseline only after verification.
- Unexplained mismatch or persistence: isolate under the incident-response plan, preserve disk and memory evidence, rotate secrets from a clean system, and escalate.
- Multiple independent indicators or tampered logs: treat the host as compromised and plan a trusted rebuild rather than relying on file deletion.
Bottom line
An rkhunter or chkrootkit warning is a lead, not a verdict. Preserve evidence before rebooting or modifying the server; investigate with trusted binaries or an offline mounted filesystem; corroborate scanner output with package verification and an independent check; and escalate when findings agree, privileged changes are unexplained, persistence is present, or logs are unreliable. When system integrity cannot be established, rebuilding from trusted media is safer than trying to clean an untrusted installation in place.
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