T1560.003: Archive via Custom Method
An adversary may compress or encrypt data that is collected prior to exfiltration using a custom method. Adversaries may choose to use custom archival methods, such as encryption with XOR or stream ciphers implemented with no external library or utility references. Custom implementations of well-known compression algorithms have also been used.
Positive Technologies products that cover the technique
MaxPatrol SIEM knowledge base
mitre_attck_collection: PT-CR-661: Data_Compression: A user archived data using a utility or PowerShell cmdlet
Detection
ID | DS0012 | Data source and component | Script: Script Execution | Description | Monitor for any attempts to enable scripts running on a system would be considered suspicious. If scripts are not commonly used on a system, but enabled, scripts running out of cycle from patching or other administrator functions are suspicious. Scripts should be captured from the file system when possible to determine their actions and intent. |
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ID | DS0022 | Data source and component | File: File Creation | Description | Monitor newly constructed files being written with extensions and/or headers associated with compressed or encrypted file types. Detection efforts may focus on follow-on exfiltration activity, where compressed or encrypted files can be detected in transit with a network intrusion detection or data loss prevention system analyzing file headers. |
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