Wallpaper wizard 1014/30/2023 Ransom note appended to head of encrypted file (catb991 variation) Instead, what could be considered the ransom note is inserted into the beginning of each encrypted file. Once encrypted, there is no blatant indicator – no separate ransom note dropped, no change to the desktop wallpaper, and no antagonizing file extensions. The lack of post-encryption alterations is a trait that sets CatB apart from other contemporaries. By default, the oci.dll payload will attempt to encrypt C:\users (crawl whole tree), I:, H:, G:, F:, E:, and D. In addition to the hardcoded exclusions, the local disk volumes to be encrypted are also configured in a similar manner. Msdtc.exe termination syntaxĬatB ransomware excludes the following files and extensions from the encryption process. Taskill.exe is used to terminate the msdtc.exe process once the service configuration changes have been made. As a result, the system will inject the malicious oci.dll into the service’s executable ( msdtc.exe) when the MSDTC service is restarted. The malware then abuses the MSDTC service, manipulating the permissions and startup parameters. Oci.dll payloads in System32 (view from Singularity™ Console) The dropper ( versions.dll) drops the payload ( oci.dll) into the System32 directory. Upon execution, CatB payloads rely on DLL search order hijacking to drop and load the malicious payload. These are direct checks for type and size of physical RAM, type and size of physical hard disks, and checking for odd or anomalous combinations of processors and cores. Sandbox evasion inhibits the analysis process and ultimately leads to more time in the target environment for the attacker.ĬatB performs three primary checks in an attempt to determine if the payload is being executed within a virtual environment. The dropper DLL is responsible for any sandbox evasion techniques required by the threat actor. This dropper deposits the second DLL payload ( oci.dll) onto the target host. CatB Ransomware Process Graphįirst, the dropper is distributed in the form of a UPX-packed DLL ( versions.dll). A dropper DLL is responsible for initial evasive environmental checks as well as dropping and launching the second DLL, which serves the ransomware payload. In this post, we offer a technical analysis of the CatB ransomware and its abuse of the legitimate MSDTC service, describing its evasion tactics, encryption behavior, and its attempts to steal credentials and browser data.ĬatB payloads are distributed as a two DLL set. String similarities in the ransom notes as well as modifications left by the ransomware payloads suggest that CatB may be either an evolution or direct rebrand of the Pandora ransomware, which was active in early to mid-2022 and targeted the automotive industry. The group’s activities have gained attention due to their ongoing use of DLL hijacking via Microsoft Distributed Transaction Coordinator (MSDTC) to extract and launch ransomware payloads. I'm including an image link that will show what I'm talking about, that I took to help another player asking how to remove their tile/wallpaper.The CatB ransomware family, sometimes referred to as CatB99 or Baxtoy, was first observed in late 2022, with campaigns being observed steadily since November. That's your 'remove' tile/wallpaper options. You'll also see when you click on that icon, 2 images in the right lower corner that shows the flooring icon and wallpaper icon with arrows. Go to the room you want to apply either in, click it, and it'll place itself in that room in the appropriate place (on the wall or on the floor). That's your tile/wallpaper button that will pull up the selections you've purchased. On the icon tool button, you'll see an image that shows the corner of a wall and floor. Then when you get to your home, open your house decorating icon (the the same button you use to place furniture). Go to the furniture stores, see which designs intrest you, and purchase one (or several as each application is for a single room). Specifically so a player can change their homes inside looks.Room by room. They sell both wallpaper and tiling at the furniture stores. It's very hard to read without having to readjust our screens first. Ya know- Change the tiles or the color and what-not? :)įirst off.Please remember that what you see on your screen isn't always what others see on their own. I was wondering if I could add new and different wallpaper to my house, before I bought it. Carlosxthexunicorn wrote: I am going to be quite frank: I find some of the castle's wallpaper to be very, very ugly and boring.
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