Concrete signature match: TrojanDropper for JavaScript platform, family Nemucod
TrojanDropper:JS/Nemucod!MSR is a malicious JavaScript file, typically distributed via spam email campaigns. Its primary function is to act as a first-stage downloader, contacting a remote server to download and execute more dangerous malware, such as ransomware or information stealers.
No detailed analysis available from definition files.
1c98dcb9fd0181016e50a12eba10a4c51202b6a9c977c0f70d083d7e9501fcecIsolate the affected machine from the network immediately. Ensure Defender has quarantined the file, then perform a full system scan to detect any secondary payloads. Identify and delete the source email to prevent reinfection and educate the user.