MSExchange Transport Agent Installation - Builtin

calendar Feb 1, 2023 · attack.persistence attack.t1505.002  ·
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Detects the Installation of a Exchange Transport Agent

Sigma rule (View on GitHub)

 1title: MSExchange Transport Agent Installation - Builtin
 2id: 4fe151c2-ecf9-4fae-95ae-b88ec9c2fca6
 3related:
 4    - id: 83809e84-4475-4b69-bc3e-4aad8568612f
 5      type: derived
 6status: test
 7description: Detects the Installation of a Exchange Transport Agent
 8references:
 9    - https://speakerdeck.com/heirhabarov/hunting-for-persistence-via-microsoft-exchange-server-or-outlook?slide=7
10author: Tobias Michalski (Nextron Systems)
11date: 2021/06/08
12modified: 2022/11/27
13tags:
14    - attack.persistence
15    - attack.t1505.002
16logsource:
17    product: windows
18    service: msexchange-management
19detection:
20    selection:
21        - 'Install-TransportAgent'
22    condition: selection
23fields:
24    - AssemblyPath
25falsepositives:
26    - Legitimate installations of exchange TransportAgents. AssemblyPath is a good indicator for this.
27level: medium

References

  • Hunting for persistence via Microsoft Exchange Server or Outlook

    Microsoft Exchange and Outlook are sufficient parts of almost any corporate infrastructure, regardless of its size. MS Exchange Servers are desired target for attackers, since in case of successful exploitation of vulnerabilities or incorrect settings of MS Exchange components, attackers can gain access to emails of the company, increase their privileges to the domain administrator, and also perform phishing mailing on behalf of the organization's representatives. Moreover, attackers have a number of original ways to obtain persistence in the system. The speaker will consider all these methods and demonstrate approaches to obtain persistence using these methods and detect such presence.


    Read More

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