In September, security researchers discovered the existence of CVE-2019-16928, a vulnerability involving the mail transfer agent Exim. Exim accounts for over 50% of publicly reachable mail servers on the internet. What makes the bug particularly noteworthy is that threat actors could exploit it to perform denial of service (DoS) or possibly even remote code execution attacks (RCE) — making it a serious concern for Exim customers who use vulnerable versions of the software.
Read More October’s Patch Tuesday is relatively modest, with Microsoft releasing a total of 59 patches. However, this shorter list still warrants attention. Nine of the 59 were still identified as Critical, while the remaining 50 were labeled Important. Most of the critical bulletins were for various Internet Explorer and Microsoft Edge vulnerabilities, with one covering a Remote Desktop Client vulnerability. The Important bulletins fixed several issues, including NTLM and Microsoft IIS server vulnerabilities.
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We found a new modular fileless botnet malware, which we named “Novter,” (also reported and known as “Nodersok” and “Divergent”) that the KovCoreG campaign has been distributing since March. We’ve been actively monitoring this threat since its emergence and early development, and saw it being frequently updated. KovCoreG, active since 2011, is a long-running campaign known for using the Kovter botnet malware, which was distributed mainly through malvertisements and exploit kits. Kovter has been involved in click fraud operations since 2015, using fraudulent ads that have reportedly cost businesses more than US$29 million. The botnet was taken down at the end of 2018 through concerted efforts by law enforcement and cybersecurity experts, including Trend Micro.
Read More We recently found and analyzed a malicious malware variant that disguised itself as a legitimate Mac-based trading app called Stockfolio. We found two variants of the malware family. The first one contains a pair of shell scripts and connects to a remote site to decrypt its encrypted codes while the second sample, despite using a simpler routine involving a single shell script, is actually incorporates a persistence mechanism.
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By Carl Maverick Pascual (Threats Analyst) Cybercriminals continue to use cryptocurrency-mining malware to abuse computing resources for profit. As early as 2017, we have also observed how they have applied fileless techniques to make detection and monitoring more difficult. On August 2, we observed a fileless cryptocurrency-mining malware, dubbed GhostMiner, that weaponizes Windows management instrumentation…
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