Caution: Big Head Ransomware on the Rise—Disguised as Phony Windows Updates

July 11, 2023
Ransomware / Windows Security

A newly emerging ransomware known as Big Head is spreading via a malvertising campaign that masquerades as fake Microsoft Windows updates and Word installers. Initially identified by Fortinet FortiGuard Labs last month, multiple variants of this ransomware have been found, all designed to encrypt files on victims’ devices in exchange for cryptocurrency payments. According to Fortinet researchers, “One variant of the Big Head ransomware presents a fake Windows Update, suggesting it may also be distributed as counterfeit updates.” Another variant features a Microsoft Word icon, indicating its distribution as fraudulent software. The majority of Big Head samples reported so far are from the U.S., Spain, France, and Turkey. Recent analysis by Trend Micro has further explored this .NET-based ransomware, highlighting its capability to deploy three encrypted binaries: 1.exe for propagation…

Warning: Big Head Ransomware on the Rise via Fake Windows Updates

July 11, 2023 – BreachSpot.com

A new strain of ransomware known as Big Head is gaining traction, being distributed through a targeted malvertising campaign that masquerades as counterfeit Microsoft Windows updates and Word installers. This ransomware was first identified last month by Fortinet’s FortiGuard Labs, which reported multiple variants engineered to encrypt victims’ files in exchange for cryptocurrency payments.

Fortinet’s researchers noted that one variant of Big Head mimics a legitimate Windows Update, suggesting that this is a common vector for its distribution. Another variant utilizes a Microsoft Word icon, indicating it is likely spread as fraudulent software. The majority of reported samples to date have originated from the United States, Spain, France, and Turkey.

In a recent examination by Trend Micro, the .NET-based ransomware was analyzed in detail, revealing its capability to deploy three encrypted binaries. This underscores the evolving sophistication of ransomware attacks that leverage social engineering techniques to exploit user trust. By presenting itself as a legitimate software update, Big Head effectively lowers the defenses of unsuspecting users.

The entities targeted by this malware tend to be businesses and individuals who may not be vigilant about verifying the legitimacy of software updates. This poses a significant risk, particularly for companies that handle sensitive data. As the gap between attackers’ tactics and organizational defenses narrows, the implications for data security become increasingly severe.

Reflecting on the techniques involved, the MITRE ATT&CK framework provides context for understanding how Big Head operates. Initial access is likely achieved through the distribution of its counterfeit updates, while persistence can result from the installation of those binaries on the victims’ machines. Furthermore, if the ransomware escalates privileges, it could potentially give attackers heightened control over the compromised systems.

As businesses navigate the complexities of cybersecurity, awareness and education about threats like Big Head are crucial. Cybersecurity teams must emphasize the importance of scrutinizing software updates and maintaining robust layers of security. Organizational preparedness should be bolstered with routine training and updates to protocols in response to evolving threats.

In light of the rising prevalence of such ransomware attacks, organizations should prioritize establishing a culture of cybersecurity awareness coupled with proactive measures. By staying informed of emerging threats like Big Head, decision-makers can better safeguard their enterprises from the cyclical nature of cyber incursions.

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