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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesThere is no universal winner. Use ImunifyAV first on a cPanel/WHM server (and verify support for your DirectAdmin edition) when you want panel integration; choose Linux Malware Detect (Maldet) for free, no-panel web-shell hunting; use ClamAV for mail servers and general file scanning; and add rkhunter or chkrootkit when rootkits are in scope. A scanner detects what its signatures and heuristics recognize, so patching, least privilege, backups and logging remain essential.
Quick recommendation by VPS workload
| VPS situation | Start with | Add when needed | Important qualification |
|---|---|---|---|
| cPanel or WHM hosting | ImunifyAV | A separate rootkit checker only if your incident model requires it | The free tier scans and detects; cleanup requires a paid upgrade. Current cPanel guidance reported by Cloudzy advises removing ClamAV when both are installed to avoid conflicts. |
| DirectAdmin hosting | ImunifyAV, if your edition and license support it | Maldet for additional web-shell checks | Confirm panel integration and licensing with the current provider documentation before deployment. |
| No control panel, hosting websites | Maldet | ClamAV as its scanning engine, plus a rootkit checker | Maldet is the strongest free choice described for web-shell hunting, but it is command-line oriented and remediation is generally manual. |
| Mail server or broad file scanning | ClamAV | Maldet for PHP/web content and a rootkit checker for a separate control | ClamAV is an open-source antivirus engine; reviewers describe weaker coverage of modern web threats than of conventional file and mail malware. |
| Suspected rootkit or backdoor | rkhunter or chkrootkit as an additional check | Imaging, credential rotation and incident response | These tools complement a malware scanner; they do not replace one. |
How to choose a Linux malware scanner
Start with the operating model rather than a feature checklist. A panel plug-in can provide inventory, scheduling and a quarantine workflow that is difficult to reproduce with a single command-line binary. Conversely, a panel may introduce conflicts when two products try to scan the same files or install competing hooks.
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cPanel/WHM and DirectAdmin users should first check whether the scanner has a supported plug-in for the exact panel version. ImunifyAV is the panel-oriented option in the available evidence. On cPanel, Cloudzy reports that current cPanel documentation recommends ImunifyAV and removing ClamAV if both are present. Treat that as an integration rule to verify in your own panel documentation, not as a reason to install both blindly.
What you need to detect
- Web shells and obfuscated PHP: prioritize Maldet or a panel product with explicit web-shell protection.
- Mail attachments and ordinary file malware: ClamAV is the conventional open-source starting point.
- Rootkits and persistence: add rkhunter or chkrootkit; they address a different problem from content scanning.
- Automatic remediation: check whether cleanup is included. Detection and quarantine are not the same as safely repairing a compromised account.
How much automation is appropriate
Real-time monitoring can shorten the interval between upload and detection, but it also increases the chance of duplicate scans, load spikes and false positives. Scheduled scans are easier to reason about on a small VPS. Whichever mode you use, define who reviews alerts and how a suspected file is isolated before enabling automatic deletion.
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ImunifyAV: the practical first choice for panel-based hosting
ImunifyAV is the clearest starting point when your VPS is managed through cPanel/WHM. The free version scans and detects malware; cleanup is a paid upgrade. That distinction matters for incident planning: a free deployment can tell you that an account is infected without restoring files, removing injected code or validating that persistence is gone.
What the available evidence supports
Cloudzy describes real-time scanning, backdoor closure and web-shell protection, with some capabilities reserved for paid plans. It also characterizes setup as less beginner-friendly. Those are secondary-source descriptions, and no primary ImunifyAV documentation or current price list was available for verification, so confirm the feature set and price in the product screen or current vendor documentation before committing.
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When to select it
- You already administer cPanel/WHM and want alerts and scan controls in the panel.
- Several hosting accounts need a shared policy rather than individual shell scripts.
- You may later pay for assisted cleanup and want that path available.
Deployment checks
- Record the panel, operating-system and kernel versions and take a restorable snapshot.
- Check the ImunifyAV plug-in’s compatibility and license state for that exact panel edition.
- Run an initial full scan during a maintenance window; monitor CPU, memory and I/O rather than assuming the scan is harmless.
- Review detections per account. Quarantine suspicious files before deleting them, and preserve hashes and timestamps for investigation.
- Resolve the ClamAV question explicitly. If the panel documentation instructs you to remove ClamAV, do so only after confirming that no mail or application workflow still depends on it.
Maldet (Linux Malware Detect): best fit for free web-shell hunting
Linux Malware Detect, commonly called Maldet, is the strongest free option described for a no-panel web-hosting VPS. Its design is aimed at finding malicious files in sites and user directories, including patterns that a general antivirus engine may not emphasize.
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Current release and detection approach
The rfxn project page lists version 2.0.1, released May 24, 2026. Official project documentation describes integration with ClamAV, real-time monitoring and quarantine, and multi-stage detection using MD5, SHA-256, HEX, YARA and statistical analysis. R-fx Networks claims that 2.0.1 can run up to 10 times faster than traditional scanners through hash-first short-circuiting and batch-parallel processing. That is a vendor performance claim, not an independent benchmark; measure scan time and load on your own VPS.
Strengths
- Useful coverage for shared hosting trees, uploaded files and PHP applications.
- Can use ClamAV as the underlying scanning engine while adding Maldet’s own logic.
- Supports quarantine, allowing review before destructive action.
- Works without a commercial control panel.
Limitations and conflicting descriptions
Some reviews call Maldet CLI-only, difficult to set up, manual to clean and lacking real-time scanning. The official rfxn documentation, however, describes real-time monitoring and quarantine. The safest interpretation is that real-time behavior depends on how the monitor component is configured; do not assume it is active merely because Maldet is installed.
One blog author reported that Maldet caught obfuscated PHP shells that ClamAV missed on a single server. That is a useful hypothesis for web hosting, not a detection-rate benchmark. Test with known benign samples and your own incident history, and do not generalize the result to every PHP framework or malware family.
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Operational workflow
- Install the current release from the official rfxn project instructions and confirm the installed version reports 2.0.1 or a newer release.
- Set an alert recipient and define a quarantine directory on a filesystem with sufficient space.
- Scan one representative account first, then expand to all web roots. A typical command-line scan is
maldet -a /path/to/webroot; verify syntax against the installed release. - Inspect each hit, compare it with application deployment records and quarantine suspicious files rather than deleting them immediately.
- After remediation, rescan the account and review web-server, SSH, FTP and application logs for the entry point.
- If you enable monitoring, watch load and event volume for several days before applying it to every account.
ClamAV: dependable general-purpose scanning, not a complete web-security plan
ClamAV is an open-source antivirus engine for detecting trojans, viruses, malware and other malicious threats. Its documentation is hosted at docs.clamav.net. It is commonly selected for mail servers and command-line file scans because it is scriptable and broadly packaged.
Where it fits best
- Scanning mail attachments before delivery.
- Checking shared upload directories and backups for known malicious files.
- Providing the engine for Maldet when both tools are configured together.
- Running repeatable scans from cron or a deployment pipeline.
Known trade-offs
Reviewers describe ClamAV as having lower detection rates for web threats, dated signatures in some comparisons and a CLI-first setup. No independent detection-rate figure was found, so those descriptions should not be converted into a percentage. A Virtualmin forum participant also claimed that roughly two-thirds of signatures are meaningless for Linux; that is an unverified forum opinion, not a measured property of the project.
ClamAV’s strength is broad, maintainable signature-based scanning. It should not be your only control for obfuscated PHP, compromised credentials, malicious cron jobs or kernel-level persistence.
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Basic maintenance pattern
- Install the distribution package and enable the signature updater, commonly exposed through
freshclam. - Run a staged scan on a small directory before scanning the entire filesystem. A common form is
clamscan -r --infected --log=/var/log/clamav/manual-scan.log /srv; package options vary, so check the local man page. - Exclude virtual filesystems such as
/proc,/sysand/devfrom broad scans unless you have a specific reason to inspect them. - Send detections to quarantine for review. Automatic removal can destroy evidence or break a legitimate application.
- Schedule scans when mail queues and backups are least active, then alert on non-zero findings and updater failures.
Rootkit checks: rkhunter and chkrootkit are add-ons
Rootkits can alter binaries, hide processes or establish persistence in places a file scanner does not inspect effectively. The available guidance names rkhunter and chkrootkit as complementary tools, and identifies chkrootkit specifically for rootkits and backdoors.
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Run a rootkit checker after a suspicious event and periodically on a hardened baseline. Record the initial warnings, because many checks report unusual but legitimate files or administrator customizations. A warning is a lead for investigation, not proof of compromise.
When a rootkit is plausible
- Unexpected privileged processes or listening ports.
- Modified system binaries or unexplained startup entries.
- Repeated reinfection after web files are cleaned.
- Evidence that an attacker obtained root rather than only a web-account password.
If compromise may include root access, stop trusting the running system. Preserve logs and disk evidence where possible, rotate credentials from a separate machine, rebuild from a known-good image and restore only verified data.
Comparison of the main options
| Criterion | ImunifyAV | Maldet | ClamAV | rkhunter / chkrootkit |
|---|---|---|---|---|
| Primary target | Panel-managed hosting accounts | Web shells and malicious web files | General files, mail and known malware | Rootkits, suspicious system changes and backdoors |
| Best environment | cPanel/WHM; verify DirectAdmin support | No-panel web-hosting VPS | Mail server or general Linux file tree | Any Linux VPS as a separate layer |
| Free capability stated in the evidence | Scan and detection; cleanup paid | Described as a free option | Open-source engine | Pricing not established here |
| Real-time operation | Cloudzy reports it, with paid feature limits possible | Official docs describe monitoring; some reviews dispute or qualify availability | Not established as a built-in web-monitoring feature | Not a substitute for real-time file scanning |
| Cleanup | Paid upgrade required for cleanup according to the available evidence | Typically administrator-led quarantine and manual repair | Detection and quarantine workflow; safe repair is your responsibility | Investigation and recovery are manual |
| Setup style | Panel plug-in | Command line | Command line and scripts | Command line |
| Independent benchmark available | No | No; the up-to-10x figure is a vendor claim | No published number in the reviewed material | No |
Practical deployment plans
Plan A: cPanel/WHM VPS
- Confirm the panel’s current malware-scanning recommendation and install ImunifyAV through the supported channel.
- Run a complete baseline scan and export the findings.
- Decide whether paid cleanup is required; do not promise customers remediation that the free tier does not provide.
- Resolve any existing ClamAV installation according to the panel guidance. Keep it only if a documented mail workflow requires it and the combination is supported.
- Add account isolation, software updates, strong authentication and off-server backups.
Plan B: no-panel web-hosting VPS
- Install Maldet 2.0.1 or the current release shown by the rfxn project.
- Configure alerts and quarantine, then scan each web root separately so ownership and timestamps remain clear.
- Enable monitoring only after measuring load and confirming the event path.
- Optionally connect ClamAV as the engine, keeping signature updates healthy.
- Schedule a full scan and a faster daily scan of upload and cache directories.
Plan C: mail or file-service VPS
- Deploy ClamAV and its signature updater.
- Scan mail staging and user-upload locations before content is made available.
- Log detections with message or file identifiers so operators can trace the source.
- Add Maldet only if the server also hosts websites where web-shell coverage is important.
Plan D: suspected compromise
- Restrict network access without destroying volatile evidence.
- Run a targeted scan and a rootkit check, but do not treat a clean result as proof that the host is safe.
- Review authentication, web-server, cron, process and outbound-network logs.
- Rotate credentials and API keys from a trusted system.
- Rebuild or restore from a verified image, patch the entry point and rescan before returning the VPS to service.
How to interpret detections and false positives
Quarantine before deletion
Malware scanners identify suspicious content; they do not know whether a file is business-critical, a legitimate administrator tool or an intentionally obfuscated deployment artifact. Quarantine preserves the sample for comparison and rollback. Keep a record of the path, owner, hash, detection name and action taken.
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- Compare the file with a trusted release package or a clean deployment artifact.
- Check ownership, modification time and the process that created it.
- Search for related files, scheduled tasks and unauthorized accounts.
- Restore only after confirming the whole application tree and credentials are clean.
Do not confuse a clean scan with a secure VPS
Signatures and heuristics can miss new, encrypted or fileless attacks. A clean result does not verify kernel integrity, credentials, exposed services, patch level or backup recoverability. Maintain updates, disable unused services, restrict SSH, use least privilege, protect secrets and test restores.
Performance, signatures and maintenance
Scanning cost depends on file count, storage speed, compression, concurrent workloads and the number of engines enabled. The Maldet project claims up to 10 times the speed of traditional scanners in version 2.0.1, but that figure has not been independently tested here. Benchmark on a staging copy or during a maintenance window, and watch I/O wait as well as CPU.
Signature freshness is equally important. Enable and monitor ClamAV updates where ClamAV is used, and keep Maldet’s data and code current. An updater that silently fails can leave a scanner looking healthy while its knowledge base ages. Record the last successful update and alert when it exceeds your policy threshold.
Decision checklist
- Do you run cPanel/WHM? Start with ImunifyAV and follow the panel’s ClamAV compatibility guidance.
- Do you run DirectAdmin? Verify that ImunifyAV supports your exact edition before installation.
- Do you host PHP sites without a panel? Use Maldet as the primary web-content scanner.
- Do you operate mail or file services? Use ClamAV and maintain its updater.
- Do you need rootkit visibility? Add rkhunter or chkrootkit and investigate warnings manually.
- Do you need automatic cleanup? Budget for the paid ImunifyAV tier or plan administrator-led remediation.
- Do you need evidence-quality response? Quarantine, preserve logs, snapshot before changes and define a rebuild procedure.
- Do you expect a benchmark-proven winner? None is available in the reviewed material; test against your own file mix.
Bottom line
Choose the scanner that matches the workload: ImunifyAV for supported panel hosting, Maldet for free web-shell hunting without a panel, ClamAV for mail and general files, and rkhunter or chkrootkit for rootkit checks. Layering helps, but installing multiple scanners without checking panel guidance can create conflicts. Detection is only the first step; reliable patching, hardening, credential control, logging and tested recovery determine whether the VPS stays secure.
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