As we all know by now, Sony Pictures Entertainment got hacked. The situation soon escalated and took a political turn indicating a state sponsored attack. Attackers stole dozens of terabytes of data amounting to massive leakage of data.
They used services like Pastebin, Mega, Rapidgator, Turbobit, etc. where they uploaded the following sensitive information
– Unreleased movies
– Script of an upcoming movie
– Employees’ and their dependents’ personal information
– Account credentials
– Executive Salaries
– UPS accounts
– Email leaks
– Aliases, phone numbers used by celebrities while traveling
DHS released the IOCs related to this attack while indirectly indicating that the attacks were targeting the Entertainment Industry. The malware used by the threat actors is very destructive and designed to carry out various malicious tasks like,
– Lateral movement which is achieved via password bruteforcing
– Overwrite attached physical drives and make them irrecoverable
– Master Boot Record overwrite
– Network Propagation
– Command and Control Activity
– Data Exfiltration
Lets take a look at some of the characteristics of the malware samples.
When run with a –i parameter, WinsSchMgmt service is created
With a –k parameter, StartServiceCtrlDispatcher is invoked to have same service WinsSchMgmt to be run in the calling process
With a –s parameter, we can see how the C2 Addresses are being utilized
Following are some of the interesting strings seen present in the sample that indicate remote share access and remote process creation.
Here is a sample run with –i parameter. We can observe file, igfxtrayex.exe being created and run. The sample also writes a file called net_ver.dat which contain records of the form hostname, ipaddress and number 2.
Next, lets look at igfxtrayex.exe.
Similar to its dropper, this sample, takes –i and –k parameters but this time uses the service name brmgmtsvc.
The execution sequence then calls the same set of ip addresses as called by the dropper previously and then drops files named as taskhostXX.exe. Respective processes are created with –w, -m, -d command line parameters.
-w option stops Terminal Service and drops a file, iissvr.exe which when ran, starts the Webserver
-m option creates a driver file called usbdrv.sys and then installs it as a USB 3.0 Host Controller. It ultimately wipes off the Master Boot Record and thus leaving the disk unusable.
-d option calls a recursive function to delete files
- do make sure standard security practices are being followed
- monitor your systems and network to find the presence of IOCs
- periodically change passwords and have regular backups of critical infrastructure
Overall, a behavior-based approach is key to catching unprecedented attacks as there are no visible, known signs while the attack is happening.