Warning for Certification Solution (VestCert) Vulnerability and Update Recommendation Posted By ASEC , March 23, 2023 Vulnerable Software and Overview VestCert is a certification program used while accessing websites, and is a non-ActiveX module developed by the Korean company, Yettiesoft. This program is registered as a Startup Program and will be relaunched by Yettiesoft’s service (Gozi) even if it is terminated. It remains constantly active as a process once it is installed, so it can be exposed to vulnerability attacks. Thus, it needs to be updated to the latest version. Description of the Vulnerability This vulnerability was first…
MDS’ Evasion Feature of Anti-sandboxes That Uses Pop-up Windows Posted By ohmintaek , March 23, 2023 AhnLab Security Emergency response Center (ASEC) is monitoring various anti-sandbox tactics to evade sandboxes. This post will cover the rather persistent anti-sandbox technique that exploits the button form of the malicious IcedID Word files and the evasion feature of AhnLab’s MDS which is meant for detecting malicious behavior. An anti-sandbox technique that exploits the button form is contained within the malicious IcedID Word file (convert.dot); however, a 2-step process is required to be done by a user before the malicious…
ASEC Weekly Malware Statistics (March 13th, 2023 – March 19th, 2023) Posted By ASEC , March 23, 2023 AhnLab Security Emergency response Center (ASEC) analysis team uses the ASEC automatic analysis system RAPIT to categorize and respond to known malware. This post will list weekly statistics collected from March 13th, 2023 (Monday) to March 19th, 2023 (Sunday). For the main category, Infostealer ranked first with 43.8%, followed by backdoor with 34.5%, downloader with 18.7%, ransomware with 1.7%, banking malware with 0.9%, and CoinMiner with 0.4%. Top 1 – Redline RedLine ranked first place with 23.4%. The malware steals…
ASEC Weekly Phishing Email Threat Trends (March 5th, 2023 – March 11th, 2023) Posted By ASEC , March 23, 2023 AhnLab Security Emergency response Center (ASEC) monitors phishing email threats with the ASEC automatic sample analysis system (RAPIT) and honeypot. This post will cover the cases of distribution of phishing emails during the week from March 5th, 2023 to March 11th, 2023 and provide statistical information on each type. Generally, phishing is cited as an attack that leaks users’ login account credentials by disguising as or impersonating an institute, company, or individual through social engineering methods. On a broader note,…
Nevada Ransomware Being Distributed in Korea Posted By skyung , March 23, 2023 AhnLab Security Emergency response Center (ASEC) discovered cases of the Nevada ransomware being distributed during the team’s internal monitoring. Nevada is a malware written using Rust as its basis and its tendency of adding the “.NEVADA” extension to the files it infects is its defining trait. After encrypting directories, it generates ransom notes with the filename “README.txt” in each directory. These notes contain a Tor browser link for ransom payments. 1. Main Features of Nevada Ransomware As shown in the…
