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Last Updated April 2, 2021
Cybersecurity and Infrastructure Security Agency (CISA) has issued an alert on active exploitation of vulnerabilities in Microsoft Exchange Server products which are used by Hafnium-attack-group and China Chopper Web Shell attacks, and other Advanced Persistence Threats.
Microsoft has detected multiple zero-day exploits being used to attack on-premises versions of Microsoft Exchange Server in limited and targeted attacks. In the attacks observed, the threat actor used these vulnerabilities to access on-premises Exchange servers which enabled access to email accounts and allowed installation of additional malware to facilitate long-term access to victim environments.
After successful exploitation activities, Attackers can gain access to email accounts and install additional malware/ scanning tools to remain persisted on the network.
Note: Exchange Online is not affected.
The following CVEs allow for remote code execution.
If any exploit attempts are observed with lateral movement activities, Netsurion’s EventTracker SOC recommends the following actions.
Recommended mitigation steps by CISA:
(Updated March 4, 2021): Disconnect vulnerable Exchange servers from the internet until a patch can be applied.
Existing P1 Alerts:
Indicators of Compromise
EventTracker SOC | EventTracker Enterprise SOC
Group Email : email@example.com
T: 877-333-1433 Extn - 3803 (OR) 1- 410-953-6776 Option 2 or Dial Extn – 3803
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