Quantum Ransomware

The threat actor was able to enter the network when a user endpoint was compromised by an IcedID payload contained within an ISO image. There is high confidence that this payload was delivered via email, however The DFIR Report team were not able to identify the delivery email.
The ISO contained a DLL file (IcedID malware) and a LNK shortcut to execute it. The end user after clicking into the ISO file, could see just a single file named document, which is a LNK shortcut to a hidden DLL packaged in the ISO. When the user clicks on the LNK file, the IcedID DLL is executed.
Upon this execution of the IcedID DLL, a battery of discovery tasks were executed using built-in Windows utilities like ipconfig, systeminfo, nltest, net, and chcp. The IcedID malware also created a scheduled task as a means of persistence on the beachhead host.

Around two hours later, Cobalt Strike was deployed using process hollowing and injection techniques. This marked the start of hands-on-keyboard activity by the threat actors. This activity included using AdFind through a batch script called adfind.bat to perform discovery of the target organizations active directory structure. The threat actors gathered host based network information by running a batch script named ns.bat, which ran nslookup for each host in the environment.

The Cobalt Strike process then proceeded to access LSASS memory to extract credentials, which a few minutes later were tested to run remote WMI discovery tasks on a server. After confirming their credentials worked with the WMI actions, the threat actor proceeded to RDP into that server, and attempted to drop and execute a Cobalt Strike DLL beacon on that server. This appeared to fail so the threat actor then opened cmd and proceeded to execute a PowerShell Cobalt Strike Beacon. This Beacon was successful in connecting to the same command and control server observed on the beachhead host.

For the next hour, the threat actor proceeded to make RDP connections to other servers in the environment. Once the threat actor had a handle on the layout of the domain, they prepared to deploy the ransomware by copying the ransomware (named ttsel.exe) to each host through the C$ share folder. They used two methods of remote execution to detonate the ransomware binary, WMI and PsExec. This ransomware deployment concluded less than four hours from the initial IcedID execution.

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