Stay Alert! The Big Head ransomware the new Windows update scam that could cost you everything. In the ever-evolving landscape of cyber threats, security researchers have recently discovered a new ransomware strain named “Big Head.” This malicious software is spreading through deceptive malvertising campaigns that lure victims with fake Windows updates and seemingly harmless Microsoft Word installers.
Contents
Discovery and Spread of Big Head Ransomware
The cybersecurity company Fortinet has conducted a thorough analysis of two samples of the Big Head malware, investigating its infection vector and execution. Meanwhile, Trend Micro has published a comprehensive technical report on Big Head, suggesting that the analyzed variants likely originate from a single operator who is experimenting with different attack approaches.
Analysis by Fortinet: Infection Vector and Execution
Fortinet‘s analysis reveals that Big Head ransomware installs three AES-encrypted files on the target system for propagation, Telegram bot communication, and file encryption. To deceive users, it can display a fake Windows update alert. Additionally, the ransomware performs various actions, including creating a registry autorun key, overwriting files, altering system file attributes, and disabling the Task Manager.
The primary method of spreading this ransomware is through malvertising campaigns that exploit users’ trust in legitimate software updates. Fake advertisements are displayed on websites, leading unsuspecting victims to download and execute the malware disguised as Windows updates or Microsoft Word installers. Once the malware is executed, it starts infecting the victim’s system, causing significant damage and encrypting valuable files.
Technical Report by Trend Micro
According to Trend Micro, two additional variants of Big Head ransomware have been analyzed. One variant incorporates data-stealing capabilities, enabling it to collect sensitive information such as browsing history, directories, drivers, processes, product keys, active networks, and even capture screenshots. Despite being relatively unsophisticated, the Big Head strain specifically targets unsuspecting consumers who may fall for easy tricks or lack awareness of cybersecurity risks.
The emergence of different variants of Big Head ransomware suggests an ongoing development and refinement process by its creators. These variants indicate that the cybercriminals behind Big Head are actively experimenting with various techniques and approaches to improve the effectiveness of their attacks and evade detection by security measures.
Actions and Deception Techniques of Big Head Ransomware
Big Head ransomware employs several tactics to maximize its impact. It assigns a unique ID to each victim, retrieved from a directory or generated using a random string. Moreover, it deletes shadow copies to hinder system restoration and encrypts files by appending a “.poop” extension to their filenames. Notably, certain directories like Windows, Recycle Bin, Program Files, Temp, Program Data, Microsoft, and App Data are skipped from encryption. Additionally, Big Head checks if it runs on a virtual box and proceeds with encryption only if the system language is not set to that of a country in the Commonwealth of Independent States.
The ransomware also utilizes social engineering techniques to deceive users. By displaying a fake Windows update alert, it tricks victims into believing that they need to install an essential security update. This tactic preys on users’ trust in software updates and their desire to keep their systems protected. Once the victim falls for the deception and executes the update, the ransomware gains access to their system, encrypts files, and demands a ransom for their release.
Ongoing Development and Refinement of Big Head Strain
The existence of multiple variants of Big Head ransomware suggests that its creators are continuously developing and refining the strain. These experiments involve exploring different approaches to improve its effectiveness and evade detection. This ongoing development underscores the need for vigilance in the face of emerging cyber threats.
To stay ahead of evolving cyber threats like Big Head ransomware, individuals and organizations should prioritize cybersecurity measures. Implementing strong security practices, such as regularly updating software, using robust antivirus solutions, and educating users about phishing and social engineering techniques, can help mitigate the risks posed by ransomware attacks.
Final Words
Big Head ransomware poses a significant cybersecurity risk, despite its relatively unsophisticated nature. It preys on unsuspecting users who may be easily deceived or lack awareness of the dangers lurking in the digital realm. By understanding the characteristics, actions, and ongoing development of Big Head, individuals and organizations can take proactive steps to protect themselves from this evolving menace.
To safeguard against ransomware attacks, it is crucial to stay informed about the latest threats, keep systems and software up to date, and maintain regular backups of important files. Additionally, fostering a culture of cybersecurity awareness and providing education and training to employees can significantly reduce the risk of falling victim to ransomware and other cyber attacks.
By providing insights into the discovery, characteristics, actions, and ongoing development of the Big Head ransomware strain, this blog post aims to raise awareness about the emerging cyber threat. Stay informed and stay secure in the face of evolving cybersecurity risks.
