What We Do
How we do it
Resources
SECURITY ADVISORIES
Oct 18, 2021
Grief Ransomware Gang Claims 41 New Victims, Targeting Manufacturers; Municipalities; & Service Companies in U.K. & Europe
Grief Operators Earned an Estimated 8.5 Million British Pounds in Four Months Key Findings: The Grief Ransomware Gang (a rebrand of the DoppelPaymer Ransomware Group) claims to have infected 41 new victims between May 27, 2021—Oct. 1, 2021 with their ransomware.Over half the companies listed on Grief’s underground leak site are based in the U.K. and Europe. The Grief Ransomware Gang appears to…
Read More
View all Advisories →
Company
ABOUT eSENTIRE
About Us
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.
Read about how we got here
Leadership Work at eSentire
LATEST PRESS RELEASE
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.…
Read More
Partners
PARTNER PROGRAM
Partners
Our award-winning partner program offers financial rewards, sales and marketing tools and personalized training. Accelerate your business and grow your revenue by offering our world-class Managed Detection and Response (MDR) services.
Learn about our Partner Program
PARTNER RESOURCES
Apply today to partner with the Authority in Managed Detection and Response.
Login to the Partner Portal for resources and content for current partners.
Search
Resources
Security advisories — Feb 26, 2019

Backdoor Trojan Found in 32-bit CCleaner Version 5.33.6162 and CCleaner Cloud Version 1.07.3191

The Threat

Security researchers have identified a two-stage back door embedded in CCleaner 5.33.6162 and CCleaner Cloud version 1.07.3191 (32-bit only for both versions). CCleaner is a legitimate Windows cleanup utility distributed by Piriform, a company owned by the antivirus vendor Avast. The back door was introduced via a supply chain compromise that allowed the attacker to insert malicious code into a legitimate installer file from the official Piriform servers. Versions prior to 5.33 are not affected, and version 5.34 has been released to remove the malicious code.

Recommended Action

Conduct anti-virus/anti-malware scans on any machines where CCleaner is known to be installed.
Update CCleaner to version 5.34 and CCleaner Cloud to version 1.07.3214.

Additional Information

The following SHA-256 file hashes are linked to the Floxif Trojan that is embedded in the affected CCleaner versions:

6f7840c77f99049d788155c1351e1560b62b8ad18ad0e9adda8218b9f432f0a9
1a4a5123d7b2c534cb3e3168f7032cf9ebf38b9a2a97226d0fdb7933cf6030ff
36b36ee9515e0a60629d2c722b006b33e543dce1c8c2611053e0651a0bfdb2e9

The hardcoded C2 server is currently unreachable and the fallback DGA domains are not controlled by the attacker. No documented instances of second stage payload activation have been reported at this time.

Please see the official Piriform Security Notification for more information:

https://www.piriform.com/news/blog/2017/9/18/security-notification-for-ccleaner-v5336162-and-ccleaner-cloud-v1073191-for-32-bit-windows-users