Cyber risk and advisory programs that identify security gaps and build strategies to address them.
MDR that provides improved detection, 24/7 threat hunting, end-to-end coverage and most of all, complete Response.
Our team delivers the fastest response time in the industry. Threat suppression within just 4 hours of being engaged.
Be protected by the best from Day 1.
24/7 Threat Investigation and Response.
Expert hunting, research and content.
Defend brute force attacks, active intrusions and unauthorized scans.
Safeguard endpoints 24/7 by isolating and remediating threats to prevent lateral spread.
Investigation and enhanced threat detection across multi-cloud or hybrid environments.
Configuration escalations, policy and posture management.
Detects malicious insider behavior leveraging Machine Learning models.
Customer testimonials and case studies.
Stories on cyberattacks, customers, employees, and more.
Cyber incident, analyst, and thought leadership reports.
Demonstrations, seminars and presentations on cybersecurity topics.
Information and solution briefs for our services.
MITRE ATT&CK Framework, Cybersecurity Assessment, SOC Calculator & more
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 |
| 20343854b8c348146bf17fe739ce9028a620f93116438291f1b0b89345e18520 | SHA-256 Hash for XMRig |
References:
[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
[6] https://twitter.com/GossiTheDog/status/1214892555306971138
[7] https://www.esentire.com/security-advisories/critical-citrix-vulnerability-exploited/