user@threatcheck.sh ~ threat-analysis
bash
$ analyze-threat Trojan:JS/GuLoader.PB!MTB
Trojan:JS/GuLoader.PB!MTB - Windows Defender threat signature analysis

Trojan:JS/GuLoader.PB!MTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Trojan:JS/GuLoader.PB!MTB
Classification:
Type:Trojan
Platform:JS
Family:GuLoader
Detection Type:Concrete
Known malware family with identified signatures
Variant:PB
Specific signature variant within the malware family
Suffix:!MTB
Detected via machine learning and behavioral analysis
Detection Method:Behavioral
Confidence:Very High
False-Positive Risk:Low

Concrete signature match: Trojan - Appears legitimate but performs malicious actions for JavaScript platform, family GuLoader

Summary:

Trojan:JS/GuLoader.PB!MTB is a JavaScript-based malware downloader detected through behavioral analysis. Its primary function is to infiltrate a system, typically through a malicious email attachment or web download, and then execute a more dangerous secondary payload, such as ransomware or an information stealer.

Severity:
Medium
VDM Static Detection:
No specific strings found for this threat
Known malware which is associated with this threat:
Filename: 20251201-0443.js
3eeef184b5629696be1c4b940d950450100ac123ab7f7709286b70450ad58997
07/12/2025
→VirusTotal↓Download Sample
Filename: Payment_Confirmation 900865 Remittance_Copy_2024-12-03_pdf.js
c7ee957c09687f1d16b1062e052d0061d98405302c8718356e5a31a01ae04d46
03/12/2025
→VirusTotal↓Download Sample
Filename: CONTRACT- 01-2026.js
59158c6b928e5408194fc8f5b7332ba667d667bf5f511d6c17230a475b3e07dd
03/12/2025
→VirusTotal↓Download Sample
Remediation Steps:
Isolate the affected machine from the network immediately. Use Windows Defender to remove the threat and perform a full system scan. Investigate for secondary payload infections and persistence mechanisms, then block the initial entry vector and reset any potentially compromised credentials.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 02/12/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊