Mirai At present, Mirai is among the biggest IoT botnet families which have the most variants and infect the most devices to impose the most extensive impact. In 2019, NSFOCUS Security Labs captured 10,635 Mirai samples in total (excluding the repetitive malware arising from cross compilation), identified 1660 C&C addresses, and detected more than 40 […]

1. Abstract In March 2020, Tencent published an article about a DVR being used for reflection attacks. Service port of this DVR is 37810, we named it DHDiscover service as there was DHDiscover shown in it. In the reflection attacks captured by Tencent, the scale of attack traffic exceeded 50G, and the reflection source regions […]

Vulnerability Description Recently, NSFOCUS detected that Palo Alto Networks (PAN) released a security advisory, which announced a critical vulnerability (CVE-2020-2040) assigned a CVSS base score of 9.8. When Captive Portal is enabled or Multi-Factor Authentication (MFA) is configured, this buffer overflow vulnerability in PAN-OS allows an unauthenticated attacker to potentially disrupt system processes and execute […]

1.  Vulnerability Description Recently, NSFOCUS detected that the foreign security company Secura disclosed detailed information and validation scripts about the Netlogon privilege escalation vulnerability (CVE-2020-1472), which increases vulnerability risks abruptly. Exploitation of this vulnerability requires a computer on the same local area network (LAN) as the target. When using the Netlogon Remote Protocol (MS-NRPC) to […]

Overview Microsoft has fixed a critical vulnerability in its September 2020 Security Updates, which is a remote code execution vulnerability (CVE-2020-16875) in Microsoft Exchange Server. Recently, relevant proof of concept (PoC) has appeared on the Internet. Due to incorrect verification of cmdlet arguments, an attacker may trigger this vulnerability by sending an email that contains […]

Vulnerability Description On September 9, 2020, Beijing time, Microsoft released September 2020 Security Updates that fix 129 vulnerabilities ranging from remote code execution to privilege escalation in various products, including Microsoft Windows, Internet Explorer, Microsoft Office, Microsoft Exchange Server, Visual Studio, and ASP.NET.

This chapter describes active botnet families under long-term tracking of and other families newly captured by NSFOCUS Security Labs, from the perspectives of their background, activity, and association with other families. Botnet Families GoBrut Malware in the GoBrut family, written in Go, made its debut in early 2019, in a bid to detect services on […]

1. Vulnerability Description On September 11, 2020, NSFOCUS detected that the Apache Software Foundation released security advisories fixing Apache DolphinScheduler permission overwrite vulnerability (CVE-2020-13922) and Apache DolphinScheduler remote code execution vulnerability (CVE-2020-11974). CVE-2020-11974 is related to mysql connectorj remote code execution vulnerability. When choosing mysql as database, an attacker could execute code remotely on the […]

1. Overview From data collected throughout 2019 and data as of June 30, 2020, we extracted information about malware, whose distribution by type is shown in Figure 1-1. Compared with 2019, the percentages of various types of malware in 2020 H1 changed, with backdoors overtaking crytominers to become No .1 with a percentage of 48.05%, […]

1. Vulnerability Description On September 11, 2020, NSFOCUS detected that the Apache Software Foundation released security advisories fixing Apache DolphinScheduler permission overwrite vulnerability (CVE-2020-13922) and Apache DolphinScheduler remote code execution vulnerability (CVE-2020-11974). CVE-2020-11974 is related to mysql connectorj remote code execution vulnerability. When choosing mysql as database, an attacker could execute code remotely on the […]