Account Discovery: Email Account
Adversaries may attempt to get a listing of email addresses and accounts. Adversaries may try to dump Exchange address lists such as global address lists (GALs).
This type of attack technique cannot be easily mitigated with preventive controls since it is based on the abuse of system features.
System and network discovery techniques normally occur throughout an operation as an adversary learns the environment. Data and events should not be viewed in isolation, but as part of a chain of behavior that could lead to other activities, such as Lateral Movement, based on the information obtained.
Monitor processes and command-line arguments for actions that could be taken to gather system and network information. Remote access tools with built-in features may interact directly with the Windows API to gather information. Information may also be acquired through Windows system management tools such as Windows Management Instrumentation and PowerShell.
- Microsoft. (2020, February 7). Address lists in Exchange Server. Retrieved March 26, 2020.
- Microsoft. (n.d.). Get-GlobalAddressList. Retrieved October 6, 2019.
- Bullock, B.. (2016, October 3). Attacking Exchange with MailSniper. Retrieved October 6, 2019.
- SensePost. (2016, August 18). Ruler: A tool to abuse Exchange services. Retrieved February 4, 2019.
- Anthony, N., Pascual, C.. (2018, November 1). Trickbot Shows Off New Trick: Password Grabber Module. Retrieved November 16, 2018.
- Symantec Security Response. (2014, July 7). Dragonfly: Cyberespionage Attacks Against Energy Suppliers. Retrieved April 8, 2016.
- CIS. (2018, December 12). MS-ISAC Security Primer- Emotet. Retrieved March 25, 2019.