Downloader Disguised With Contents on Violation of Intellectual Property Rights (Detected by MDS) Posted By muhan , September 14, 2023 On August 28, AhnLab Security Emergency response Center (ASEC) discovered circumstances of a downloader in distribution disguised with contents regarding the violation of intellectual property rights, targeting unspecified masses in Korea. The distributed malware included a code that detects virtual environments to evade sandbox-based security solutions and was a .NET-type that downloads the MainBot malware. Judging from the file information collected by AhnLab Smart Defense (ASD) and VirusTotal, it seems that Korea and Taiwan were the target destinations for distribution….
GuLoader Malware Disguised as Tax Invoices and Shipping Statements (Detected by MDS Products) Posted By AhnLab_en , August 10, 2023 AhnLab Security Emergency response Center (ASEC) has identified circumstances of GuLoader being distributed as attachments in emails disguised with tax invoices and shipping statements. The recently identified GuLoader variant was included in a RAR (Roshal Archive Compressed) compressed file. When a user executes GuLoader, it ultimately downloads known malware strains such as Remcos, AgentTesla, and Vidar. AhnLab’s MDS products provide a Mail Transfer Agent (MTA) feature to block malware distributed via email. Figure 3 below shows the GuLoader malware detection…
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…
DarkSide Ransomware With Self-Propagating Feature in AD Environments Posted By Bellyoon , February 6, 2023 In order to evade analysis and sandbox detection, DarkSide ransomware only operates when the loader and data file are both present. The loader with the name “msupdate64.exe” reads the “config.ini” data file within the same path that contains the encoded ransomware and runs the ransomware on the memory area of a normal process. The ransomware is structured to only operate when a specific argument matches. It will then register itself to the task scheduler and run itself periodically. The following…
