Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Application Security //

Ransomware

4/8/2019
09:45 AM
Larry Loeb
Larry Loeb
Larry Loeb
50%
50%

FIN6 Expands Its Range With Ransomware

The well-known FIN6 group has been spotted trying its luck at a new game: ransomware.

When a threat actor changes up on their usual actions, it can reflect many things. Perhaps their usual scams aren't working as well as they once did. Perhaps they have a new tool to play with. In any case, the well-known FIN6 group has been spotted trying a new game: ransomware.

FIN6 has historically targeted payment card data. Its intrusions have targeted point-of-sale (POS) environments, deploying TRINITY malware. But security firm Fireeye saw the group's traces at one of its customers, which was within the engineering industry. There was no card data near this site, so something else had to be up.

The Fireeye team found that "FIN6 was in the initial phase of an intrusion using stolen credentials, Cobalt Strike, Metasploit, and publicly available tools such as Adfind and 7-Zip to conduct internal reconnaissance, compress data, and aid their overall mission."

They also identified suspicious SMB connections and Windows Registry artifacts which indicated the attacker had installed malicious Windows services to execute PowerShell commands on remote systems.

FIN6 in this case compromised an Internet-facing system in order to gain a foothold. It then used stolen credentials to allow it to move laterally within the environment using the Windows' Remote Desktop Protocol (RDP).

Once it had moved, PowerShell was invoked to run a multi-stage Cobalt Strike httpsstager which downloaded and ran three payloads. Alternatively, a Metasploit gambit was undertaken that once again used PowerShell to execute commands. The Metasploit reverse HTTP payload was configured to communicate with the command and control (C2) server over TCP port 443.

The Metasploit framework has a tool that enables SYSTEM-level privilege escalation, and it was used in this case.

After all this setup, Adfind was used to query Active Directory, and then 7-zip was used to compress the results for exfiltration. These files showed the Active Directory users, computers, organizational units, subnets, groups and trusts. They could derive from this list which accounts could access additional hosts in the domain. They were able to move laterally in the environment using RDP and then configured where it moved to as malware "distribution" servers. The distribution servers were used to stage the LockerGoga ransomware, additional utilities, and deployment scripts to automate installation of the ransomware.

They also took the step of trying to kill any antivirus software that was around.

Fireeye has been able to identify since July 2018 multiple targeted Ryuk and LockerGoga ransomware incidents that show ties to FIN6. But most importantly, these sorts of incidents have increased as the card-stealing activities of FIN6 have decreased.

Time alone will tell if FIN6 is changing focus, or just trying out some side hustle.

— Larry Loeb has written for many of the last century's major "dead tree" computer magazines, having been, among other things, a consulting editor for BYTE magazine and senior editor for the launch of WebWeek.

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
News
US Formally Attributes SolarWinds Attack to Russian Intelligence Agency
Jai Vijayan, Contributing Writer,  4/15/2021
News
Dependency Problems Increase for Open Source Components
Robert Lemos, Contributing Writer,  4/14/2021
News
FBI Operation Remotely Removes Web Shells From Exchange Servers
Kelly Sheridan, Staff Editor, Dark Reading,  4/14/2021
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Current Issue
2021 Top Enterprise IT Trends
We've identified the key trends that are poised to impact the IT landscape in 2021. Find out why they're important and how they will affect you today!
Flash Poll
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2021-31607
PUBLISHED: 2021-04-23
In SaltStack Salt 2016.9 through 3002.6, a command injection vulnerability exists in the snapper module that allows for local privilege escalation on a minion. The attack requires that a file is created with a pathname that is backed up by snapper, and that the master calls the snapper.diff function...
CVE-2021-31597
PUBLISHED: 2021-04-23
The xmlhttprequest-ssl package before 1.6.1 for Node.js disables SSL certificate validation by default, because rejectUnauthorized (when the property exists but is undefined) is considered to be false within the https.request function of Node.js. In other words, no certificate is ever rejected.
CVE-2021-2296
PUBLISHED: 2021-04-22
Vulnerability in the Oracle VM VirtualBox product of Oracle Virtualization (component: Core). The supported version that is affected is Prior to 6.1.20. Difficult to exploit vulnerability allows high privileged attacker with logon to the infrastructure where Oracle VM VirtualBox executes to compromi...
CVE-2021-2297
PUBLISHED: 2021-04-22
Vulnerability in the Oracle VM VirtualBox product of Oracle Virtualization (component: Core). The supported version that is affected is Prior to 6.1.20. Difficult to exploit vulnerability allows high privileged attacker with logon to the infrastructure where Oracle VM VirtualBox executes to compromi...
CVE-2021-2298
PUBLISHED: 2021-04-22
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.23 and prior. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attac...