0nb.7z ★ Verified Source

: Analysis from ThreatLocker highlights that attackers prefer tools like 7-Zip because they are often pre-approved in corporate environments, making it difficult for standard antivirus software to flag their use as malicious.

: NIST notes that this specific vulnerability can bypass the "Mark-of-the-Web" protection mechanism, which typically warns users when opening files downloaded from the internet. 0NB.7z

: The campaign primarily targeted governmental and civilian organizations in Ukraine as part of the Russo-Ukrainian conflict. : Older community discussions, such as those on

: Older community discussions, such as those on Reddit , have debated the cryptographic implementation in 7-Zip, though many reported "flaws" were later deemed low-risk or debunked by the developer. : Older community discussions

Other security-focused blog posts have explored the broader risks associated with archiving tools:

On February 4, 2025, researchers at Trend Micro published a blog post detailing how Russian-linked threat actors exploited a zero-day vulnerability in 7-Zip, identified as .

: The vulnerability was used to deploy the SmokeLoader malware, which functions as a loader for further cyberespionage tools.