Joint CISA-FBI Cybersecurity Advisory on Sophisticated Spearphishing Campaign

Original release date: May 28, 2021

CISA and the Federal Bureau of Investigation (FBI) are responding to an ongoing spearphishing campaign targeting government organizations, intergovernmental organizations, and non-governmental organizations. A sophisticated cyber threat actor leveraged a compromised end-user account from Constant Contact—a legitimate email marketing software company—to spoof a U.S. government organization and distribute links to malicious URLs.

In response, CISA and FBI have released Joint Cybersecurity Advisory AA21-148A: Sophisticated Spearphishing Campaign Targets Government Organizations, IGOs, and NGOs and Malware Analysis Report MAR-10339794-1.v1, providing tactics, techniques, and procedures (TTPs); downloadable indicators of compromise (IOCs); and recommended mitigations.

CISA strongly encourages organizations to review AA21-148A and  MAR-10339794-1.v1 and apply the necessary mitigations.

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FBI Update on Exploitation of Fortinet FortiOS Vulnerabilities

Original release date: May 28, 2021

The Federal Bureau of Investigation (FBI) has released an FBI FLASH, APT Actors Exploiting Fortinet Vulnerabilities to Gain Access for Malicious Activity, which describes advanced persistent threat (APT) actors exploiting known Fortinet FortiOS vulnerabilities. APT actors may exploit these vulnerabilities to gain initial access to multiple government, commercial, and technology services to conduct future attacks. This is a follow up to the FBI-CISA Joint Cybersecurity Advisory AA21-092A: APT Actors Exploit Vulnerabilities to Gain Initial Access for Future Attack, originally published April 2, and provides indicators of compromise (IOCs) and additional recommended mitigations.

CISA encourages users and administrators to review the IOCs and updated mitigations in FBI FLASH MI-000148-MW and refer back to AA21-092A for additional information.

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Microsoft Announces New Campaign from NOBELIUM

Original release date: May 27, 2021

The Microsoft Threat Intelligence Center (MSTIC) has released information on the uncovering of a widespread malicious email campaign undertaken by the activity group that Microsoft tracks as NOBELIUM. NOBELIUM was initially identified in November 2020, during an intrusion at a major cybersecurity organization. Microsoft security researchers identify NOBELIUM as the actor responsible for the 2020 compromise of the SolarWinds Orion platform, and subsequent activity targeting other Microsoft customer networks and cloud assets.

CISA encourages users and administrators to review MSTIC’s blog post New sophisticated email-based attack from NOBELIUM and apply the necessary mitigations.

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Updates to Alert on Pulse Connect Secure

Original release date: May 27, 2021

CISA has updated Alert AA21-110A: Exploitation of Pulse Connect Secure Vulnerabilities to include new threat actor techniques, tactics, and procedures (TTPs), indicators of compromise (IOCs), and updated mitigations.  

CISA encourages users and administrators to review AA21-110A and the following resources for more information:
•    Re-Checking Your Pulse
•    Ivanti KB44755 – Pulse Connect Secure (PCS) Integrity Assurance
•    Ivanti Security Advisory SA44784
•    Emergency Directive 21-03: Mitigate Pulse Connect Secure Product Vulnerabilities

 

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Drupal Releases Security Updates

Original release date: May 27, 2021

Drupal has released security updates to address a vulnerability affecting Drupal 8.9, 9.0, and 9.1. An attacker could exploit this vulnerability to take control of an affected system.

CISA encourages users and administrators to review Drupal Advisory SA-CORE-2021-003 and apply the necessary updates or mitigations.

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Google Releases Security Updates for Chrome

Original release date: May 26, 2021

Google has released Chrome version 91.0.4472.77 for Windows, Mac, and Linux. This version addresses vulnerabilities that an attacker could exploit to take control of an affected system.

CISA encourages users and administrators to review the Chrome Release Note and apply the necessary updates.

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VMware Releases Security Updates

Original release date: May 26, 2021

VMware has released security updates to address multiple vulnerabilities in vCenter Server and Cloud Foundation. A remote attacker could exploit some of these vulnerabilities to take control of an affected system.

CISA encourages users and administrators to review VMware Security Advisory VMSA-2021-0010 and apply the necessary updates and workarounds.

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Apple Releases Security Updates

Original release date: May 25, 2021

Apple has released security updates to address vulnerabilities in multiple products. An attacker could exploit some of these vulnerabilities to take control of an affected device.

CISA encourages users and administrators to review the Apple security pages for the following products and apply the necessary updates.

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Cisco Releases Security Updates for Multiple Products  

Original release date: May 19, 2021 | Last revised: May 20, 2021

Cisco has released security updates to address vulnerabilities in multiple Cisco products. A remote attacker could exploit some of these vulnerabilities to take control of an affected system. For updates addressing lower severity vulnerabilities, see the Cisco Security Advisories page.

CISA encourages users and administrators to review the following Cisco advisories and apply the necessary updates:

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Update to CISA-FBI Joint Cybersecurity Advisory on DarkSide Ransomware

Original release date: May 19, 2021

CISA and the Federal Bureau of Investigation (FBI) have updated Joint Cybersecurity Advisory AA21-131A: DarkSide Ransomware: Best Practices for Preventing Disruption from Ransomware Attacks, originally released May 11, 2021. This update provides a downloadable STIX file of indicators of compromise (IOCs) to help network defenders find and mitigate activity associated with DarkSide ransomware. These IOCs were shared with critical infrastructure partners and network defenders on May 10, 2021.

CISA encourages users and administrators to review AA21-131A for more information.

 

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