Those detections are difficult to maintain as they need to be updated every time the crypter evolves.Ĭrypters render automated static analysis useless, as analysis tools will only see the crypter code and not the final payload. Security solutions need to implement specific detections for crypters that are known to be malicious. Ideally, packer/crypter code should be considered the same as malware and raise alarms, but what makes it a difficult task is that legitimate packers do exist and should not be blocked. Reverse engineers working on improving malware detection often focus on the malware itself because it can be packed or crypted with any crypter tool and it’s important to detect the final payload, which is the most malicious component of the attack. As Check Point stated in the report: “Packers often get less attention, as researchers tend to focus their attention on the actual malware, leaving the packer stub untouched.”
The crypter/packer problem has been around for many years. What can be done against the TrickGate threat? Once the payload is decrypted, it is injected in a new process by a set of direct calls to the kernel. TrickGate always changes the way the payload is decrypted so that automated unpacking for another version is useless. It then adds unrelated clean code and debug strings inside the crypted file in order to raise false flags for the analysts and render the analysis harder. It uses the API hash resolving technique to hide the names of the Windows APIs strings as they are turned into a hash number. TrickGate’s functionalitiesĪlthough the code analyzed by the researchers has changed over the last six years, the main functionalities exist on all samples. As it’s unlikely that different threat actors took vacation at the same time, the researchers dug further and found TrickGate. When Check Point suddenly stopped seeing that code being used, they discovered that it had stopped deploying for several different attack campaigns at the exact same time. Security researchers considered parts of the TrickGate code to be shared code that would be widely used by many cybercriminals, as is often the case in the malware development environment where developers often copy existing code from others and modify it.
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All the usual initial compromise vectors can be used, such as phishing emails or abuse of vulnerabilities to compromise a server or computer, and the crypted files might be in archive files (ZIP, 7 ZIP or RAR) or in the PDF or XLSX format. The threats crypted by TrickGate are delivered in different formats depending on the threat actor deploying it. What can be done against the TrickGate threat?Ĭheck Point monitored 40 to 650 attacks per week over the last two years and found the most popular malware family crypted by TrickGate was FormBook, an information stealer malware.The crypter has been in development since 2016 when it was used to spread the Cerber malware, but it has been used for several major malware campaigns, including Trickbot and Emotet ( Figure A).įigure A Image: Check Point. In new research, Check Point has exposed a crypter dubbed TrickGate developed by cybercriminals and sold as a service. New research from Check Point Research exposes a crypter that stayed undetected for six years and is responsible for several major malware infections around the globe.
TrickGate crypter discovered after 6 years of infections import randomĪbc = 'a b c d e f g h i j k l m n o p q r s t u v w x y z'Ĭode = '! # $ % ^ & * ( ) _ + § ±. The things is I don't know if encrypting part or decrypting part is broken I would appreciate any help. My code was working but it suddenly broke. When you crypt a text it works but when you try to decrypt in it gives weird result.
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