SysJoker malware: hazardous, evasive, and adaptable

December 13, 2022
Joker malware
A fresh form of malware was identified in 2021’s final days infiltrating a Linux-based system. Its ability to infect Windows, macOS, and Linux operating systems is concerning given that antivirus-scanning software was discovered to be unable to identify it and that it contains numerous forms. This new spyware, known as SysJoker, needs to be on everyone’s radar.


SysJoker malware: what is it?

SysJoker can be summed up in the simplest terms as a backdoor. A backdoor is a way for unauthorized users to get around some security precautions and access a computer network.

Hackers and other cybercriminals frequently utilize backdoors to enter a system and carry out a variety of nefarious tasks. Implementing ransomware, incorporating keylogging software, injecting disruptive malware, and carrying out unwanted surveillance are some examples of such actions.

The behavior of SysJoker often follows a similar pattern. It keeps track of, records, and communicates precise information about the computer it has infected. SysJoker poses a threat to MAC addresses, usernames, and IP addresses alike. SysJoker appears to be mostly used for spying and surveillance purposes.


Joker malware


What distinguishes SysJoker from other backdoors?

SysJoker was currently assaulting the web servers of a “major educational institution” when it was first identified in late December 2021. Although it was initially thought that the bug would only affect Linux systems, Windows and macOS variants were shortly found. The security company that uncovered the finding, Intezer, speculates that the initial attack may have taken place earlier this year.

Only the victim can initiate the activation of SysJoker. The program, which is presented as a system update, must be downloaded and installed by the user. This straightforward method of deception highlights the risk posed by socially engineered cyberattacks.

SysJoker differs from other varieties of malware in that it appears to have been created from scratch and is not based on any other virus. In reality, the malware’s intricacy and connection to four different command-and-control servers suggest that a lot of time and money were likely invested in its development. It isn’t from your standard, everyday cybercriminal. SysJoker’s creators are knowledgeable.

The numerous command-and-control servers can keep adding to and instructing it. With guidance from the control servers, SysJoker may eventually gain more power or develop stronger skills.

How can SysJoker be found and removed?

SysJoker was very recently discovered, making it almost entirely invisible by conventional virus-scanning tools. Fortunately, there are ways to determine whether this particularly persistent issue has infected your PC.

On their computers, users can run a memory scanner. A memory scanner can find the SysJoker data payload even though your default antivirus program won’t be able to recognize the new piece of malware. Once it is discovered, it is crucial that you remove all fresh SysJoker files and shut down all associated processes.

Run a memory scan one more when this step is finished to make sure SysJoker has been completely eliminated. After your systems have been cleaned, it’s time to identify the malware’s point of entry. Keep in mind that the user must download and install the file for SysJoker.


Joker malware 2


How to guard against getting SysJoker on your machine

Learning some fundamental cybersecurity etiquette is the best way to stop SysJoker from wreaking havoc on your network. Never even consider trying to figure out where a link came from if you receive an email or message with one. Put it in the garbage right away. Hackers count on the ignorance of uninformed users.

You can also use FreeZone VPN’s Threat Protection feature in this situation. It eliminates online dangers before they can actually harm your device. TP can detect harmful files, prevent you from visiting dangerous websites, and block trackers and advertisements.

SysJoker pretends to be a software update. SysJoker cannot access you if you haven’t downloaded anything from any dubious websites or clicked on any strange links. Additionally, SysJoker attacked the educational system and appeared to have been developed with a sizable budget. As a result, whoever funded the research is unlikely to be interested in deceiving the typical user.

The key is knowledge. Hackers always target the ignorant and gullible.