Event Overview Recently, NSFOCUS CERT, through ongoing monitoring, found that the source code of the Paradise ransomware was leaked. Since data encrypted by Paradise cannot be decrypted now, the source code, if widely spread over the Internet, may cause a lot of trouble. Paradise had its source code leaked on...
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Windows Print Spooler RCE Vulnerabilities (CVE-2021-1675/CVE-2021-34527) Mitigation Guide
Overview On July 7, 2021, Beijing time, Microsoft released a security patch on the PrintNightmare vulnerability (CVE-2021-34527). NSFOCUS CERT recommends that users install this patch as soon as possible. On June 29, NSFOCUS CERT found that a security researcher published an exploit of the Windows Print Spooler remote code execution...
2020 DDoS Attack Landscape Report – 4
Key Findings - 5 The Number of DDoS Attacks on Healthcare, Education, and Government Sectors Increased Significantly During the COVID-19 Pandemic The healthcare sector suffered more DDoS attacks during the COVID-19 pandemic than previous years. According to statistics2, the number of attacks in each month in 2020 H2 increased year...
Case Study: A 400G DDoS Attack Event Captured By NSFOCUS in Hong Kong S.A.R.
Event look back A NSFOCUS Cloud DPS customer with their servers located in Hong Kong SAR has encountered a series of mass DDoS attacks lasted for four (4) days, from June 20th to 24th. The attackers managed to create serval spikes including the biggest one reaching 399.2 Gbps and followed...
Recommendations on Protection Against Random Subdomain Attacks
What is a Random Subdomain Attack? A Random subdomain attack is also known as a pseudo-random subdomain (PRSD) attack due to the use of pseudo-random algorithms. A PRSD attack is an approach of double attack against both DNS caching servers of Internet service providers (ISPs) and local authoritative servers of...
“Netfilter” malicious driver bypasses Microsoft’s signature system
In June 2021, German computer security solutions software company G Data Software detected a malicious driver named "Netfilter". Unexpectedly, the malicious driver bypassed and obtained Microsoft's file signature. When Microsoft learned about it, it immediately added the signature of the malware to the security center of the Windows system for...
