|Platform||Windows Server 2003, Windows Server 2008, Windows Server 2012, Windows XP, Windows 7, Windows 8, Windows Server 2003 R2, Windows Server 2008 R2, Windows Server 2012 R2, Windows Vista, Windows 8.1|
|Data Sources||File monitoring, Process monitoring, Process command-line parameters|
Collected data is staged in a central location or directory prior to Exfiltration. Data may be kept in separate files or combined into one file through techniques such as Data Compressed or Data Encrypted.
Interactive command shells may be used, and common functionality within cmd may be used to copy data into a staging location.
- Threat Group-3390 actors saved RAR files for exfiltration in the Recycler directory. They have also staged RAR files, renamed with a .zip file extension, on externally accessible Web servers and then issued HTTP GET requests to exfiltrate the files from the victim network.1
- Lazarus Group malware IndiaIndia saves information gathered about the victim to a file that is saved in the %TEMP% directory, then compressed, encrypted, and uploaded to a C2 server.2
- TRINITY malware used by FIN6 identifies payment card track data on the victim and then copies it to a local file in a subdirectory of C:\Windows\. Once the malware collects the data, FIN6 actors compressed data and moved it to another staging system before exfiltration.3
- SPACESHIP identifies files with certain extensions and copies them to a directory in the user's profile.4
- FLASHFLOOD stages data it copies from the local system or removable drives in the "%WINDIR%\$NtUninstallKB885884$\" directory.4
- Modules can be pushed to and executed by Duqu that copy data to a staging area, compress it, and XOR encrypt it.5
- ADVSTORESHELL stores output from command execution in a .dat file in the %TEMP% directory.6
- Rover copies files from removable drives to C:\system.7
- Trojan.Karagany can create a directory (C:\ProgramData\Mail\MailAg\gl) to use as a temporary directory for uploading files.8
- Prikormka creates a directory, %USERPROFILE%\AppData\Local\SKC\, which is used to store collected log files.9
- BADNEWS copies documents under 15MB found on the victim system to is the user's %temp%\SMB\ folder.10
- USBStealer collects files matching certain criteria from the victim and stores them in a local directory for later exfiltration.1112
Identify unnecessary system utilities or potentially malicious software that may be used to collect data from removable media, and audit and/or block them by using whitelisting13 tools, like AppLocker,1415 or Software Restriction Policies16 where appropriate.17
Processes that appear to be reading files from disparate locations and writing them to the same directory or file may be an indication of data being staged, especially if they are suspected of performing encryption or compression on the files.
Monitor processes and command-line arguments for actions that could be taken to collect and combine files. Remote access tools with built-in features may interact directly with the Windows API to gather and copy to a location. Data may also be acquired and staged through Windows system management tools such as Windows Management Instrumentation and PowerShell.
- Dell SecureWorks Counter Threat Unit Threat Intelligence. (2015, August 5). Threat Group-3390 Targets Organizations for Cyberespionage. Retrieved January 25, 2016.
- Novetta Threat Research Group. (2016, February 24). Operation Blockbuster: Loaders, Installers and Uninstallers Report. Retrieved March 2, 2016.
- FireEye Threat Intelligence. (2016, April). Follow the Money: Dissecting the Operations of the Cyber Crime Group FIN6. Retrieved June 1, 2016.
- FireEye Labs. (2015, April). APT30 AND THE MECHANICS OF A LONG-RUNNING CYBER ESPIONAGE OPERATION. Retrieved May 1, 2015.
- Symantec Security Response. (2011, November). W32.Duqu: The precursor to the next Stuxnet. Retrieved September 17, 2015.
- ESET. (2016, October). En Route with Sednit - Part 2: Observing the Comings and Goings. Retrieved November 21, 2016.
- Ray, V., Hayashi, K. (2016, February 29). New Malware ‘Rover’ Targets Indian Ambassador to Afghanistan. Retrieved February 29, 2016.
- Symantec Security Response. (2014, July 7). Dragonfly: Cyberespionage Attacks Against Energy Suppliers. Retrieved April 8, 2016.
- Cherepanov, A.. (2016, May 17). Operation Groundbait: Analysis of a surveillance toolkit. Retrieved May 18, 2016.
- Settle, A., et al. (2016, August 8). MONSOON - Analysis Of An APT Campaign. Retrieved September 22, 2016.
- Calvet, J. (2014, November 11). Sednit Espionage Group Attacking Air-Gapped Networks. Retrieved January 4, 2017.
- Kaspersky Lab's Global Research and Analysis Team. (2015, December 4). Sofacy APT hits high profile targets with updated toolset. Retrieved December 10, 2015.
- Beechey, J. (2010, December). Application Whitelisting: Panacea or Propaganda?. Retrieved November 18, 2014.
- Tomonaga, S. (2016, January 26). Windows Commands Abused by Attackers. Retrieved February 2, 2016.
- NSA Information Assurance Directorate. (2014, August). Application Whitelisting Using Microsoft AppLocker. Retrieved March 31, 2016.
- Corio, C., & Sayana, D. P. (2008, June). Application Lockdown with Software Restriction Policies. Retrieved November 18, 2014.
- Microsoft. (2012, June 27). Using Software Restriction Policies and AppLocker Policies. Retrieved April 7, 2016.