Data from Local System
Sensitive data can be collected from local system sources, such as the file system or databases of information residing on the system prior to Exfiltration.
Adversaries will often search the file system on computers they have compromised to find files of interest. They may do this using a Command-Line Interface, such as cmd, which has functionality to interact with the file system to gather information. Some adversaries may also use Automated Collection on the local system.
FLASHFLOOD searches for interesting files (either a default or customized set of file extensions) on the local system. FLASHFLOOD will scan the My Recent Documents, Desktop, Temporary Internet Files, and TEMP directories. FLASHFLOOD also collects information stored in the Windows Address Book.
Lazarus Group malware IndiaIndia saves information gathered about the victim to a file that is uploaded to one of its 10 C2 servers. Lazarus Group malware RomeoDelta copies specified directories from the victim's machine, then archives and encrypts the directories before uploading to its C2 server.
This type of attack technique cannot be easily mitigated with preventive controls since it is based on the abuse of system features.
Monitor processes and command-line arguments for actions that could be taken to collect files from a system. Remote access tools with built-in features may interact directly with the Windows API to gather data. Data may also be acquired through Windows system management tools such as Windows Management Instrumentation and PowerShell.
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