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Big Head ransomware, a rapidly emerging threat, has caught the attention of security researchers at Trend Micro. These experts have delved deep into its internal structure to unravel its hidden secrets and shed light on its malicious capabilities.
In their comprehensive analysis, Trend Micro highlighted the intricate workings of this .NET-based ransomware. Big Head employs three encrypted binary files to carry out its malicious activities. The first, 1.exe, serves as a distributor of malware. The second, archive.exe, enables communication via the messaging app Telegram. Lastly, Xarch.exe encrypts files while posing as a fake Windows update.
Unveiling Big Head Ransomware: Deceptive Tactics and Unknown Threat Actors
The sophistication of Big Head ransomware lies in its ability to deceive unsuspecting users. It presents an authentic-looking Windows update screen, tricking victims into believing they are installing legitimate software. To add credibility, the progress of the update is cleverly simulated by incrementing the percentage every 100 seconds.
Similar to its ransomware counterparts, Big Head wipes out backups, terminates multiple processes, and diligently scans for virtualized environments before initiating its file encryption operations. Additionally, it cunningly disables the Task Manager, ensuring that users are unable to interrupt or investigate the malicious processes at play. Notably, if the system language matches certain languages like Russian or Ukrainian, Big Head self-destructs, leaving minimal trace behind.
But that’s not all. Big Head demonstrates its versatility through different variants, each with its unique capabilities. One variant combines ransomware functionalities with stylish elements, leveraging the power of the open-source tool WorldWind Stealer. This enables the collection of sensitive information, including web browser history, directory listings, running processes, product keys, and network details, adding an extra layer of threat.
Another variant of Big Head integrates with the Neshta file virus, injecting malicious code into executable files on compromised systems. This clever tactic disguises the ransomware as a different type of threat, potentially diverting the attention of security systems primarily focused on detecting ransomware attacks.
Despite the relentless efforts of cybersecurity experts, the identity of the malicious actors behind Big Head remains elusive. However, Trend Micro has uncovered a vital clue – a YouTube channel associated with the hackers, named “aplikasi premium cuma Cuma.” This connection suggests a possible link to an attacker based in Indonesia.
The versatility and sophistication of Big Head ransomware pose significant challenges for system protection. Defending against this formidable threat requires tailored defense strategies, as its varied attack vectors demand customized approaches. By staying vigilant and leveraging the insights provided by security experts, organizations can better shield themselves against the menace of Big Head ransomware and safeguard their valuable digital assets.