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MetaDefender Core
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Core


Knowledge Base
v5.10.1
Configuration and Settings

Can local AVs interrupt ongoing scans?

Can I create new workflows?

Can I control access to the RAM disk in MetaDefender Core v5?

Can I view configuration changes on the Core side (audit)?

How can I add a mail server to the Core deployment?

How do I prevent Symantec Endpoint Protection from interfering with the optimal
functioning of MetaDefender Core?

How can I find a sanitized file scanned with MetaDefender Core v5?

The retry mechanism for MetaDefender Core connecting to the remote Postgres
Database

Using MetaDefender Core V5 Blocklist/Allowlist feature

How can I configure the maximum queue size in MetaDefender Core v5 ?

How do I remove an engine from my MetaDefender instance?

How can the Temp folder be changed?

How can I increase parallel count and Max queue size

How can I change MetaDefender Core Deep CDR's timeout settings?

My scans keep failing due to an exceeded archive file number, how do I determine
the number of files in an archive and then configure my process settings
accordingly?

Why are password protected archives blocked and how do I unblock them?

How to disable WEB UI file scan without user authentication

How To Allow Only Certain Files to be Scanned with MetaDefender Core

How to generate an API key on the Core deployment?

How to Modify the Hostname of Your MetaDefender Core Server and Potential Impact

Permissions on shared folder for temp directory

How to Integrate Kaspersky AV as an External Scanner?

Implement numerical escape function for HTML

Password Reset for Users


Errors and Troubleshooting

What can I do if MetaDefender shows a high number of files that failed to scan?

What should I do if an engine is in "failed" or "permanently failed" status?

Engine clean-up instructions

Why is the scan stuck in "processing" state on WebScan UI, when the Core
Processing History shows that it is already finished?

Why have the ESET and Kaspersky scan engines failed to initialize on the
hardened Linux OS?

Why has the Symantec custom engine failed to deploy?

What are common reasons for Deep CDR scan/sanitization failures and how do I fix
them?

What do the various error messages mean in MetaDefender Core RestAPI?

Why are some modules not appearing in my MetaDefender Core inventory?

Why does my MetaDefender Core install fail?

Why do you sometimes see a discrepancy between the File Type and MIME Type
information?

Why files are not sanitized

Receiving “400” error for API file submission

Mitigating Scan Failures in MetaDefender Core Triggered by Real-Time Protection
Systems

Resolving MetaDefender Core Service Start-up Failures on IPv6-Disabled Linux
Systems

Understanding OPSWAT's Multiscanning AV Detection Differences Compared to Other
Scanners

Inaccessible Management Console


Features and Functionality

Using a RAMDISK for the tempdirectory

What features of MetaDefender Core version 3 are available in version 5 ?

Why does ClamAV seem to be slower than other engines?

What temporary folder do Custom Engines use ?

What PDF file annotations are Supported/Non-Supported by MetaDefender Core’s
Deep CDR?

What does "Potentially Vulnerable File" result mean?

What CAB files are Supported/Non-Supported by MetaDefender’s Deep CDR?

What are the MetaDefender Core Security Policies and how do they work?

Is Metadefender Core compromised while scanning files?

Queue mechanism on Metadefender Core

How does the Post Actions feature work?

How does the External Scanners feature work?

How do I generate and save a MetaDefender Core scan result summary in JSON
format?

How and why are my image files altered during processing with Deep CDR and
Proactive DLP?

Does MetaDefender Core v5 offer real-time antivirus protection on the system
where it is installed?

Does MetaDefender Core v5 Detect the NotPetya Ransomware?

Are there any limitations to the MetaDefender Core scan engines?

Can MetaDefender Core block renamed files (such as renamed .exe files)?

How can I export the processing history from the Core console?

I forgot my login password, what can I do?

Utilizing YARA Rules with MetaDefender Core

MetaDefender Core and Its Protective Measures


Feedback and Support

How do I obtain a Trial License for MetaDefender Core?

How long is the support lifecycle for a specific version of MetaDefender Core?

How do I get a False Detection (False Positive or False Negative) corrected?


Licensing, Setup and Deployment

What dependencies does MetaDefender’s Deep CDR for Linux have?

What links, target-services or target host-IPs need to be allowed for
Metadefender Core to function accurately?

How do I set up exclusions on my anti-malware software to prevent disruption of
the MetaDefender Core scanning process, when my corporate policy does not allow
it?

How do I deploy MetaDefender Core to an offline Windows environment?

How do I deploy MetaDefender Core to an offline Linux environment?

Does the Deployment ID change at any time?

How do I activate my offline deployment of MetaDefender Core?

How do I activate/deactivate a MetaDefender Core Deployment via API calls?

How do I update to a new license key on a Metadefender Core server?

What types of licenses are available for MetaDefender Core?

After license renewal does the product activation happen automatically (if the
license key is the same)?

How to install .NET 6 Runtime dependencies on Linux Distributions?

List of folders that should be removed after MetaDefender Core uninstallation on
Linux

How to connect LDAP via SSL on Linux

Backup and Restore standalone database for MetaDefender Core


Testing MetaDefender Core

Is there a virus test I could use to test MetaDefender Core engines?

How do I check if "noexec" flag exists on a Linux OS?

How can I run tests to see the different scan results on MetaDefender Core?


Updates, Patches and Bug Fixes

Are scan engine updates automatic?

What operating system patches should be applied to the system hosting
MetaDefender Core?

How do I check the update status of MetaDefender Core’s licensed AV scan
engines?

What is the frequency of signature/definition updates on MetaDefender Core?

Why does the Deep CDR engine keep failing to update?

Discontinuation of Kaspersky Support for Windows and Linux


Version Upgrades

Are MetaDefender Core v5 upgrades free?

Are MetaDefender Core version upgrades automatic?

What is the latest MetaDefender Core version?




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MY SCANS KEEP FAILING DUE TO AN EXCEEDED ARCHIVE FILE NUMBER, HOW DO I DETERMINE
THE NUMBER OF FILES IN AN ARCHIVE AND THEN CONFIGURE MY PROCESS SETTINGS
ACCORDINGLY?

This article applies to all MetaDefender Core V4 and V5 releases deployed on
Windows or Linux systems.

MetaDefender Core’s built-in Archive Extraction Engine supports a wide range of
archive, archive-like, and encrypted file formats, many of which can contain
hundreds or even thousands of child-files that will need to be extracted for
processing.

Our supported file types include the following.

Pure archive formatsZip, 7z, JAR, RAR, RAR5, TAR, ISO, CAB, ARJ, LHA, LZH, RPM,
DEB, LZMA, WIM, DMG, XAR, MSM, SFX, XZ, VDI, VHD, CPIO, HFS, APK, GZ, MSI, TAZ,
TGZ, TBZ, BZ2, VIB, AR, ALZ, TSE, TSEC, TSEZ, ACE, PST, OST, OFT, IPA, JMOD,
MSIX, APPX, EGG, DLL, and PGP (with password only)Self-extracting archive
formatswhich are created by both 7zip, WinRAR, PKZIP and IExpressMicrosoft
Office Documents(e.g. DOCX files) which are detected as archive files by
defaultEmail/Calendar files(e.g. EML, MSG and ICS) which are extracted to scan
header, body, attachmentsEncrypted files7z, Zip, RAR, PDF, MS Word (DOC, DOCX,
DOCM, DOTX and DOTM) / Excel (XLS, XLSX, XLSM, XLSB, XLTM) / Powerpoint (PPT,
PPTX, PPTM, PPSM, POTX and POTM) which can be decrypted by the archive module
with a given password.

To avoid seeing your scans fail due to Exceeded Archive File Number and other
archive related issues, users attempting to scan large volume archives, large
image files and other archive-like formats should adjust their settings
accordingly.

Unfortunately, there’s no quick-fix in terms of estimating the number of
child-files or folders within a given archive, so it is recommended that you
test and adjust your settings against a file that is a fair, general
representation of the larger files you’re expecting to scan.

To access these settings, follow the instructions below:

 1. Go to your MetaDefender Core Management Console>Workflow
    Management>Workflows, to select your chosen workflow, as illustrated in the
    screenshot below.


 2. Inside your chosen workflow, click on the Archive tab, as shown below, where
    you can configure a range of archive-related rules.


 3. Now, adjust the following values to a level that lets your test-file scan to
    completion. Then allow some room for error:
    1. Max recursion level
    2. Max number of files extracted
    3. Max total size of extracted files
    4. Archive analysis timeout

So, if your test archive is allowed through at 4500, set the levels to 5000,
etc.


 4. Finally, click Save to apply your settings before processing your files as
    needed.

By adjusting this set of rules on any workflow in which you’re expecting a
throughput of large volume archive, image and archive-like files, you can
minimize or even eliminate the number of scans that fail due to archive-related
factors, including exceeded archive file numbers.

If you have followed the instructions above but are still Experiencing Failed
Scans Due To Exceeded Archive Numbers, please follow these instructions on How
To Create a Support Package, before logging a Support Ticket with the OPSWAT
team.


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My scans keep failing due to an exceeded archive file number, how do I determine
the number of files in an archive and then configure my process settings
accordingly?