Account Credentials Theft in Domain Environments Detected by EDR
The “Internal Reconnaissance in Domain Environments Detected by EDR” [1] post covered cases where EDR was used to detect the process of a threat actor taking over a system in an Active Directory environment before conducting internal reconnaissance to collect information. If an organization’s infrastructure is an environment that uses
Internal Reconnaissance in Domain Environments Detected by EDR
While threat actors can raise a profit by installing CoinMiners or ransomware after initial access, they often first install a backdoor or RAT malware to seize control over the infected system. Infostealers are used for the purpose of stealing user information in the system, but sometimes, they are used to
Infected Systems Controlled Through Remote Administration Tools (Detected by EDR)
Remote administration tools are software for managing and controlling terminals at remote locations. The tools can be used as work-at-home solutions in circumstances such as the COVID-19 pandemic and for the purpose of controlling, managing, and repairing unmanned devices remotely. Such remote control tools used for legitimate purposes are called
Ransomware Attacks Using RDP as the Attack Vector (Detected by EDR)
A remote desktop service refers to the feature that allows remote control of other PCs. In Windows, this service is provided by default through Remote Desktop Protocol (RDP). This means that if the target system is a Windows environment, RDP can be used to control this remote target without having
LNK Files Distributed Through Breached Legitimate Websites (Detected by EDR)
AhnLab Security Emergency response Center (ASEC) detected circumstances of a malware strain being distributed through breached legitimate websites using various file names, prompting users to run them. This post will introduce how AhnLab EDR analyzes and detects the method of malware distribution using LNK files as the medium, a method that
CoinMiner Distribution Process within Infiltrated Systems (Detected by EDR)
AhnLab Security Emergency Response Center (ASEC) has identified the process through which threat actors install CoinMiners, which utilize a compromised system’s resources for cryptocurrency mining. This post will cover how the AhnLab EDR product detects the installation process of CoinMiners that use system resources for cryptocurrency mining. Figure 1. Execution
Downloader Disguised With Contents on Violation of Intellectual Property Rights (Detected by MDS)
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
GuLoader Malware Disguised as Tax Invoices and Shipping Statements (Detected by MDS Products)
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
V3 Detects and Blocks Magniber Ransomware Injection (Direct Syscall Detection)
The Magniber ransomware is consistently being distributed at high volumes. It has been distributed through the IE (Internet Explorer) vulnerability for the past few years but stopped exploiting the vulnerability after the support for the browser ended. Recently, the ransomware is distributed with filenames disguised as a Windows security update
Changes Detected in CHM Malware Distribution
AhnLab Security Emergency response Center (ASEC) has previously covered a CHM malware type impersonating Korean financial institutes and insurance companies. Recently, the execution method of this malware type has been changing every week. This post will cover how the changed execution processes of the CHM malware are recorded in AhnLab’s EDR
