ByteFence Malware: Analysis, Detection, Removal

What is ByteFence malware?

ByteFence is a potentially unwanted program (PUP) that mimics legitimate antivirus tools but is associated with questionable installation methods, such as bundling with freeware. Classified often as adware or a PUP, ByteFence generates intrusive pop-ups, prompts unnecessary updates, and pressures users into purchasing its premium services. While it might not directly harm systems, its deceptive tactics and resource consumption make it a nuisance for organizations.

When was ByteFence first discovered?

ByteFence first gained attention as a PUP around 2018, although its exact development timeline remains unclear. It became infamous for being sneakily installed alongside third-party software, drawing the attention of cybersecurity researchers and antivirus communities.

Who created ByteFence?

The specific developer or organization responsible for ByteFence remains ambiguous. Given its distribution tactics and behavior, there is speculation that it stems from less reputable software businesses that monetize user frustration.

What does ByteFence target?

ByteFence primarily targets individual users and small-to-medium-sized organizations reliant upon freeware installations. It infiltrates systems through bundled installation packages, making it hard to identify by less vigilant IT teams.

ByteFence distribution method

ByteFence spreads predominantly through bundling tactics, where it is packaged alongside free or pirated software. Users may unknowingly agree to its installation during a rushed or misleading setup process. It is also distributed via deceptive ads and low-trust download platforms.

Technical analysis of ByteFence malware

ByteFence functions as an obtrusive PUP that embeds itself into system processes to generate constant notifications and pop-ups. Upon installation, ByteFence modifies startup entries to ensure persistence. Its detection processes are geared toward inflating concerns about system vulnerabilities to convince users to upgrade. This creates unnecessary distractions, consumes resources, and complicates efficient IT infrastructure management.

Tactics, Techniques & Procedures (TTPs)

MITRE ATT&CK Techniques Relevant:

T1566.001 (Spearphishing with Attachment)
T1547.001 (Persistence via Registry Run Keys)

ByteFence's behavior includes persistent alerts, deceptive scans, and resource consumption tactics to drive user engagement.

Indicators of Compromise (IoCs)

Domains frequently associated with ByteFence installations include:

installbytefence.com
bytefence.com

Hash examples:

MD5:0b74c8d4cabf2a34c4c0024410bac0eb
SHA-256:f4d9b8bcc9ec67b3a2f4a5a62956b981cfc08918243ee66315edf4734a8b509f

How to know if you’re infected with ByteFence?

Common signs of ByteFence include unexplained security notifications, persistent alerts urging updates, and system slowdowns. You may also observe ByteFence processes running in Task Manager and see its app shortcuts automatically added to your desktop.

ByteFence removal instructions

The fastest way to remove ByteFence is by using a reliable EDR (Endpoint Detection and Response) or ITDR (Identity Threat Detection and Response) tool. Alternatively, users can manually uninstall ByteFence by accessing their system’s application manager and removing associated files. However, thorough checks for leftover components or registries are vital for complete cleanup.

Is ByteFence still active?

ByteFence remains active and continues to target unsuspecting users. It regularly appears in freeware bundles and via deceptive online promotions. Staying vigilant and keeping endpoints protected with robust cybersecurity solutions is essential to counter this ongoing threat.

Mitigation & prevention strategies

Patch systems regularly to ensure vulnerabilities cannot be exploited during installation bundling processes.
Educate employees and users about the risks of third-party software and bundled installations.
Monitor endpoints with managed detection tools, such as Huntress, to detect and prevent PUPs like ByteFence in real-time.

Leverage Huntress’s 24/7 monitoring and incident response tools to protect against ByteFence and other malicious actors before they impact your organization.

ByteFence FAQs

ByteFence is a potentially unwanted program (PUP) that disguises itself as an antivirus tool. It typically works by generating repeated security notifications or scans to pressure users into purchasing its premium product.

ByteFence spreads through bundled freeware installations, where users inadvertently agree to install it during a rushed setup process. It’s also distributed via deceptive ads and questionable download links.

Yes, ByteFence remains active and is still distributed via bundling tactics and online ads. Its persistent presence makes it important for organizations to educate users and monitor endpoints for protection.

Organizations should adopt robust cybersecurity measures like frequent patching, employee training programs, and deploying managed detection tools. Solutions like Huntress can help detect and remove PUPs like ByteFence effectively.