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The Hacker News - Cybersecurity News and Analysis: code signing

Google Warns of a New Way Hackers Can Make Malware Undetectable on Windows

Google Warns of a New Way Hackers Can Make Malware Undetectable on Windows

September 24, 2021Ravie Lakshmanan
Cybersecurity researchers have disclosed a novel technique adopted by a threat actor to deliberately evade detection with the help of malformed digital signatures of its malware payloads. "Attackers created malformed code signatures that are treated as valid by Windows but are not able to be decoded or checked by OpenSSL code — which is used in a number of security scanning products," Google Threat Analysis Group's Neel Mehta  said  in a write-up published on Thursday. The new mechanism was observed to be exploited by a notorious family of unwanted software known as  OpenSUpdater  that's used to download and install other suspicious programs on compromised systems. Most targets of the campaign are users located in the U.S. who are prone to downloading cracked versions of games and other grey-area software. The findings come from a set of OpenSUpdater  samples   uploaded  to VirusTotal at least since mid-August. While adversaries in the past have relied on illega
Signature Validation Bug Let Malware Bypass Several Mac Security Products

Signature Validation Bug Let Malware Bypass Several Mac Security Products

June 12, 2018Swati Khandelwal
A years-old vulnerability has been discovered in the way several security products for Mac implement Apple's code-signing API that could make it easier for malicious programs to bypass the security check, potentially leaving millions of Apple users vulnerable to hackers. Josh Pitts, a researcher from security firm Okta, discovered that several third-party security products for Mac—including Little Snitch, F-Secure xFence, VirusTotal, Google Santa, and Facebook OSQuery—could be tricked into believing that an unsigned malicious code is signed by Apple. Code-signing mechanism is a vital weapon in the fight against malware, which helps users identify who has signed the app and also provides reasonable proof that it has not been altered. However, Pitts found that the mechanism used by most products to check digital signatures is trivial to bypass, allowing malicious files bundle with a legitimate Apple-signed code to effectively make the malware look like it has been signed by
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