What We Do
How we do it
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…
Read More
View all Advisories →
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
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
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
Apply today to partner with the Authority in Managed Detection and Response.
Login to the Partner Portal for resources and content for current partners.
Security advisories — Jan 14, 2020

Update: Critical Citrix Vulnerability Exploited

The Threat:

The eSentire Security Operations Center (SOC) has observed active exploitation of Citrix vulnerability CVE-2019-19781 to deliver cryptocurrency mining malware to vulnerable systems. At this time, eSentire has only seen CVE-2019-19781 exploited to install a cryptocurrency miner, but CVE-2019-19781 could be exploited for a wide variety of malicious purposes. Due to the ease of exploitation, lack of available security patches, and the observation of attacks against eSentire clients, the eSentire Threat Intelligence team recommends applying the mitigation actions provided by Citrix as soon as possible [1].

What we’re doing about it:

What you should do about it:

Additional information

CVE-2019-19781 allows simple directory traversal by a remote attacker in Citrix Application Delivery Controller (ADC) and Gateway 10.5, 11.1, 12.0, 12.1, and 13.0. No patches have been made available at this time.

At this time, all activity identified by eSentire security teams has been related to deploying cryptocurrency miners. Associated indicators of compromise can be found below.

Event Timeline

Dec 16 - Vulnerability publicly disclosed by Citrix [3]

Dec 16 - Mitigation steps provided by Citrix [1]

Dec 23 - Positive Technologies comments on the potential impact of the vulnerability [4]

Dec 31 - SANS releases a speculative proof of concept [5]

Jan 8 - Active exploitation of honeypot environment observed by researcher Kevin Beaumont [6]

Jan 8 - Initial Citrix advisory was released by eSentire [7]

Jan 12 - Exploitation to deliver cryptocurrency mining malware was identified by eSentire

Expected Patch Release [8]

Version Expected Patch Release Date
13 Jan 27, 2020
12.1 Jan 27, 2020
12 Jan 20, 2020
11.1 Jan 20, 2020
10.5 Jan 31, 2020

Indicators of Compromise (Cryptocurrency Malware Campaign)

IOC Description
hxxp: //185.178[.]45.221/ci.sh Hosting installation script for cryptocurrency miner
hxxp: //62.113[.]112.33/ci.sh Hosting installation script for cryptocurrency miner
hxxp: //217.12[.]221.12/netscalerd XMRig Cryptocurrency Miner
185.178[.]45.221 IP Address
62.113[.]112.33 IP Address
217.12[.]221.12 IP Address
08f76eb3d62d53bff131d2cb0af2773d MD5 Hash for XMRig
fecccb8a7274992fb76426457bb8a8cc76637d46 SHA-1 Hash for XMRig

SHA-256 Hash for XMRig


[1] https://support.citrix.com/article/CTX267679

[2] https://www.trustedsec.com/blog/netscaler-remote-code-execution-forensics/

[3] https://support.citrix.com/article/CTX267027

[4] https://www.ptsecurity.com/ww-en/about/news/citrix-vulnerability-allows-criminals-to-hack-networks-of-80000-companies/

[5] https://isc.sans.edu/forums/diary/Some+Thoughts+About+the+Critical+Citrix+ADCGateway+Vulnerability+CVE201919781/25660/

[6] https://twitter.com/GossiTheDog/status/1214892555306971138

[7] https://www.esentire.com/security-advisories/critical-citrix-vulnerability-exploited/

[8] https://www.citrix.com/blogs/2020/01/11/citrix-provides-update-on-citrix-adc-citrix-gateway-vulnerability/