Crysis Threat Actor Installing Venus Ransomware Through RDP
AhnLab Security Emergency response Center (ASEC) has recently discovered that the Crysis ransomware’s threat actor is also using the Venus ransomware in the attacks. Crysis and Venus are both major ransomware types known to target externally exposed remote desktop services. [1] Actual logs from the AhnLab Smart Defense (ASD) infrastructure also
Malware Execution Method Using DNS TXT Record
AhnLab Security Emergency response Center (ASEC) has confirmed instances where DNS TXT records were being utilized during the execution process of malware. This is considered meaningful from various perspectives, including analysis and detection as this method has not been widely utilized as a means of executing malware. DNS TXT record
Kimsuky Distributing CHM Malware Under Various Subjects
AhnLab Security Emergency response Center (ASEC) has continuously been tracking the Kimsuky group’s APT attacks. This post will cover the details confirmed during the past month of May. While the Kimsuky group often used document files for malware distribution, there have been many recent cases where CHM files were used
Malware Disguised as HWP Document File (Kimsuky)
AhnLab Security Emergency response Center (ASEC) has recently confirmed malware, which was previously distributed in CHM and OneNote file formats, being distributed as an executable. Considering that the words used in the malware and the executed script code are similar to that of previously analyzed codes, it is suspected that
Analysis of Ransomware With BAT File Extension Attacking MS-SQL Servers (Mallox)
AhnLab Security Emergency response Center (ASEC) has recently discovered the Mallox ransomware with the BAT file extension being distributed to poorly managed MS-SQL servers. Extensions of files distributed to poorly managed MS-SQL servers include not only EXE but also BAT, which is a fileless format. The files distributed with the
RecordBreaker Infostealer Disguised as a .NET Installer
Malware that are being distributed disguised as cracks are evolving. In the past, malware was simply distributed as the executable itself. However, there was a gradual shift towards also including normal files within a compressed file. More recently, there was a sample where a normal installer was downloaded and executed.
Tsunami DDoS Malware Distributed to Linux SSH Servers
AhnLab Security Emergency response Center (ASEC) has recently discovered an attack campaign that consists of the Tsunami DDoS Bot being installed on inadequately managed Linux SSH servers. Not only did the threat actor install Tsunami, but they also installed various other malware such as ShellBot, XMRig CoinMiner, and Log Cleaner.
Damages to Multiple Korean Websites Created by a Certain Website Development Company
AhnLab Security Emergency response Center (ASEC) has discovered instances of websites created by a certain Korean website development company being targeted by attacks and being used to distribute malware. This specific website development company has created websites for a wide range of companies including manufacturing, trade, electrical, electronics, education, construction,
Warning: Malware Disguised as a Security Update Installer Being Distributed
AhnLab, in collaboration with the National Cyber Security Center (NCSC) Joint Analysis and Consultation Council, has recently uncovered the attack of a hacking group that is supported by a certain government. The discovered malware disguised itself as a security update installer and was developed using the Inno Setup software. A
Similar AhnLab Response Cases Regarding Korea-US Joint Cyber Security Advice
On June 2nd, the Korean NIS (National Intelligence Service), NPA (National Police Agency), and MOFA (Ministry of Foreign Affairs) released a joint security advisory regarding the spear phishing attacks of North Korea’s Kimsuky group with the US FBI (Federal Bureau of Investigation), DoS (Department of State), and NSA (National Security
