ChinaZ DDoS Bot Malware Distributed to Linux SSH Servers Posted By Sanseo , March 24, 2023 AhnLab Security Emergency response Center (ASEC) has recently discovered the ChinaZ DDoS Bot malware being installed on inadequately managed Linux SSH servers. As one of the Chinese threat groups that were first discovered around 2014, the ChinaZ group installs various DDoS bots on Windows and Linux systems. [1] Major DDoS bots assumed to have been created by the ChinaZ threat group include XorDDoS, AESDDos, BillGates, and MrBlack. This article will cover the DDoS bot known as ChinaZ or ChinaZ DDoSClient. 1. Attack…
OneNote Malware Disguised as Compensation Form (Kimsuky) Posted By yeeun , March 24, 2023 AhnLab Security Emergency response Center (ASEC) has discovered the distribution of a OneNote malware disguised as a form related to compensation. The confirmed file is impersonating the same research center as the LNK-type malware covered in the post below. Based on the identical malicious activity performed by the VBS files, the team has deduced that the same threat actor is behind both incidents. Malware Distributed Disguised as a Password File As shown in the figure below, a page discussing compensation…
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…
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…
ShellBot Malware Being Distributed to Linux SSH Servers Posted By Sanseo , March 17, 2023 AhnLab Security Emergency response Center (ASEC) has recently discovered the ShellBot malware being installed on poorly managed Linux SSH servers. ShellBot, also known as PerlBot, is a DDoS Bot malware developed in Perl and characteristically uses IRC protocol to communicate with the C&C server. ShellBot is an old malware that has been in steady use and is still being used today to launch attacks against Linux systems. 1. Attack Campaigns Against Linux SSH Servers Unlike desktop, which is the main…
