Nemucod (JS.Nemucod)

Posted: January 13, 2024
from Cybersecurity Glossary
Aliases:
JS.Nemucod, TrojanDownloader:JS/Nemucod, Nemucod!, Trojan.JS.NEMUCOD, W32/Nemucod
Category:
Platform:
Windows , Linux , macOS
Variants:
NemucodAES, Nemucod-7z, NemucodHTA
Damage:
Malware Infection, File Corruption And Loss, Unauthorized Access, Data Theft
Risk Level:
High

Nemucod serves as a trojan downloader and dropper designed for delivering ransomware and various other malware. It disseminates through malicious JavaScript and PHP files, as well as email attachments. Upon infiltrating the system, Nemucod proceeds to download and install malicious software.

Possible symptoms

  • Unusual system behavior, poor performance or crashes
  • Unexpected pop-ups or error messages
  • Strange processes running in the Task Manager
  • Unexplained network activity or bandwidth usage
  • Disabled antivirus or security software

Sources of the infection

  • Malicious JavaScript and PHP files
  • Email attachments containing the trojan
  • Compromised websites hosting malicious content
  • Drive-by downloads from infected websites
  • Exploiting software vulnerabilities and security loopholes

Overview

Nemucod, also known by aliases like JS.Nemucod, TrojanDownloader:JS/Nemucod, Nemucod!, Trojan.JS.NEMUCOD, and W32/Nemucod, is a trojan with the potential for causing significant damage, including malware infections, file corruption and loss, unauthorized access, and data theft.

Nemucod operates as a trojan downloader or dropper, serving as a conduit for the delivery of ransomware and various other types of malware. Its propagation is facilitated through the use of malicious JavaScript and PHP files, as well as email attachments.

One of the notable characteristics of Nemucod is its ability to disseminate across multiple platforms, including Windows, Linux, and macOS. The trojan has several variants, such as NemucodAES, Nemucod-7z, and NemucodHTA.

Common symptoms of Nemucod infection include unusual system behavior, crashes, error messages, dubious processes present in the list of running ones, unexplained network activity or bandwidth usage, and disabled antivirus or security software.

Nemucod can be encountered through various sources, including malicious JavaScript and PHP files, email attachments containing the trojan, compromised websites hosting malicious content, drive-by downloads from infected websites, and the exploitation of software vulnerabilities and security loopholes.

If you suspect your system is infected with Nemucod, it is crucial to take immediate action. Isolate the infected system from the Internet to prevent more malware injection, run a Gridinsoft Anti-Malware scan to detect and remove the Nemucod malware, and monitor system logs for any suspicious activity.

To prevent Nemucod infections in future, follow security measures: keep your operating system and software up-to-date with the latest security patches, avoid opening email attachments or clicking on links from unknown or suspicious sources, use a reliable antivirus or antimalware solution and keep it updated, enable automatic software updates to ensure timely patching of vulnerabilities.

🤔 What to do?

If you suspect your system is infected with Nemucod, take immediate action:

  1. Isolate the infected system from the network to prevent further spread.
  2. Run a Gridinsoft Anti-Malware scan to detect and remove the Nemucod malware.
  3. Monitor system logs for any suspicious activity and investigate accordingly.

🛡️ Prevention

To prevent Nemucod infections, follow these security measures:

  • Keep your operating system and software up-to-date with the latest security patches.
  • Avoid opening email attachments or clicking on links from unknown or suspicious sources.
  • Use a reliable antivirus or antimalware solution and keep it updated.
  • Enable automatic software updates to ensure timely patching of vulnerabilities.
  • Regularly backup important data and store it in a secure, offline location.

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