Security daily (29-05-2021)

Researchers Demonstrate 2 New Hacks to Modify Certified PDF Documents

Cybersecurity researchers have disclosed two new attack techniques on certified PDF documents that could potentially enable an attacker to alter a document's visible content by displaying malicious content over the certified content without invalidating its signature. "The attack idea exploits the flexibility of PDF certification, which allows signing or adding annotations to certified documents (The Hacker News)

Researchers Warn of Facefish Backdoor Spreading Linux Rootkits

Cybersecurity researchers have disclosed a new backdoor program capable of stealing user login credentials, device information and executing arbitrary commands on Linux systems. The malware dropper has been dubbed "Facefish" by Qihoo 360 NETLAB team owing its capabilities to deliver different rootkits at different times and the use of Blowfish cipher to encrypt communications to the (The Hacker News)

Chinese Cyber Espionage Hackers Continue to Target Pulse Secure VPN Devices

Cybersecurity researchers from FireEye unmasked additional tactics, techniques, and procedures (TTPs) adopted by Chinese threat actors who were recently found abusing Pulse Secure VPN devices to drop malicious web shells and exfiltrate sensitive information from enterprise networks. FireEye's Mandiant threat intelligence team, which is tracking the cyber espionage activity under two activity (The Hacker News)


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