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Oct 19, 2021
Hackers Infect Employees of Law Firms, Manufacturing Companies, and Financial Services Orgs. with Increasingly Pervasive Infostealer, SolarMarker
SolarMarker Infects 5X More Corporate Victims Using Over a Million Poisoned WordPress Pages Key Takeaways eSentire has observed a fivefold increase in SolarMarker infections. Prior to September, eSentire’s Threat Response Unit (TRU) detected and shut down one infection per week. Beginning in September, TRU averaged the detection and shutdown of five per week. SolarMarker is a…
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eSentire is The Authority in Managed Detection and Response Services, protecting the critical data and applications of 1000+ organizations in 70+ countries from known and unknown cyber threats. Founded in 2001, the company’s mission is to hunt, investigate and stop cyber threats before they become business disrupting events.
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Oct 12, 2021
eSentire Launches MDR with Microsoft Azure Sentinel Extending Response Capabilities Across Entire Microsoft Security Ecosystem
Waterloo, ON – Oct. 12, 2021 -- eSentire, recognized globally as the Authority in Managed Detection and Response (MDR), today announced the expansion of its award-winning MDR services with Microsoft Azure Sentinel, as part of its integration with the complete Microsoft 365 Defender and Azure Defender product suites supporting Microsoft SIEM, endpoint, identity, email and cloud security services.…
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Security advisories — Sep 17, 2020

Ransomware Groups Exploit Remote Access Services

THE THREAT

Ransomware threat groups are actively abusing known exploits and compromised accounts to obtain access to environments via remote access services such as VPN and RDP. eSentire has observed this activity in recent incidents involving Revil (Sodinokibi), SunCrypt, and Netwalker ransomware. Reports from CISA and the FBI confirm that remote access services, especially VPN, are being actively targeted by multiple threat groups, including Nation States [1][2].

eSentire recommends organizations protect accounts with Multi-Factor Authentication (MFA) and ensure externally facing services are prioritized for patching.

What we’re doing about it

What you should do about it

Additional information

Analysis of incidents detected by eSentire’s Security Operations Center shows use of compromised accounts and exploitation of externally facing systems as initial access methods for multiple ransomware threats. Known vulnerabilities and absence of MFA on remote access services played a significant part in these attacks.

Private and government entities such as Microsoft and Cybersecurity and Infrastructure Security Agency (CISA) have all made similar observations across several ransomware and APT groups [3].

Accessing VPN Using Compromised Accounts:

Vulnerabilities Actively Exploited by Ransomware Threats:

Additional Observations

Relationships with Commodity Malware

Multiple malware families are linked to ransomware groups. Malware such as Quakbot, Trickbot, Dridex and Emotet are known to install ransomware as part of post-compromise operations. In a recent incident, eSentire observed interactive operators arrive on the compromised asset within one hour of initial infection. Positive identification of these malware types should be treated as precursor activity to ransomware and prioritized accordingly.

Zerologon Vulnerability

The risk of ransomware deployment has increased due to the release of CVE-2020-1472, its associated technical details, and Proof of Concept (PoC) exploit code. This vulnerability affects Windows servers and could be used to escalate attacker privileges and rapidly deploy ransomware. eSentire released an advisory on CVE-2020-1472 on September 14, 2020 [4].

Password attacks and eSentire’s detection methods are discussed at length in the September Customer Connect Webinar [5].

References:

[1] https://us-cert.cisa.gov/sites/default/files/publications/AA20-258A-Chinese_Ministry_of_State_Security-Affiliated_Cyber_Threat_Actor_Activity_S508C.pdf

[2] https://us-cert.cisa.gov/ncas/alerts/aa20-259a

[3] https://www.microsoft.com/security/blog/2020/04/28/ransomware-groups-continue-to-target-healthcare-critical-services-heres-how-to-reduce-risk/

[4] https://www.esentire.com/security-advisories/cve-2020-1472-technical-details-released

[5] https://www.esentire.com/resources/library/september-2020-threat-intelligence-observations-on-demand