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

Trojan:VBS/GuLoader.RBJ!MTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Trojan:VBS/GuLoader.RBJ!MTB
Classification:
Type:Trojan
Platform:VBS
Family:GuLoader
Detection Type:Concrete
Known malware family with identified signatures
Variant:RBJ
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 VBScript platform, family GuLoader

Summary:

Trojan:VBS/GuLoader.RBJ!MTB is a highly confident concrete detection of a VBScript-based GuLoader Trojan, identified through machine learning behavioral analysis. This threat functions as a sophisticated downloader, designed to fetch and execute secondary, more potent malicious payloads, significantly increasing the risk of subsequent system compromise and data exfiltration.

Severity:
Critical
VDM Static Detection:
Relevant strings associated with this threat:
 - \Activate\Cannibalization\Distractible (PEHSTR_EXT)
 - konebytningens\purismen\pygmaean (PEHSTR_EXT)
 - %Azoturia%\lumina (PEHSTR_EXT)
 - animhdr vicevrtens.exe (PEHSTR_EXT)
 - Siliciumets\trykketeknikkerne\livsforsikringens (PEHSTR_EXT)
 - %Pseudoanatomic%\Krocket22 (PEHSTR_EXT)
 - 5\Snorkel.Eve (PEHSTR_EXT)
 - semicollegiate.exe (PEHSTR_EXT)
Known malware which is associated with this threat:
Filename: 16074100.vbs
dec4521ef1688d3a113fc505cb0c11e1694b760a3c3e34fee7cc7a42445b93db
17/01/2026
→VirusTotal↓Download Sample
Filename: Documented_Invoice_0133.vbs
7f627cdab1b4f563bc979f2ee5610cd58a7bfc5b3f487d5a649ed0db119fbf02
17/01/2026
→VirusTotal↓Download Sample
Filename: Documented_Invoice_0152.vbs
f5ed5de812a2c6876241c4603d178874bb63ae268c80fa34ccd1375c99d6bd97
15/01/2026
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the affected system from the network. Perform a full, deep scan with updated antivirus software and remove all detected malicious files. Due to GuLoader's nature as a loader, thoroughly investigate the system for potential follow-on infections and consider re-imaging if compromise cannot be fully ruled out.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 15/01/2026. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
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