user@threatcheck.sh ~ threat-analysis
bash
$ analyze-threat Trojan:MSIL/FormBook.SI!MTB
Trojan:MSIL/FormBook.SI!MTB - Windows Defender threat signature analysis

Trojan:MSIL/FormBook.SI!MTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Trojan:MSIL/FormBook.SI!MTB
Classification:
Type:Trojan
Platform:MSIL
Family:FormBook
Detection Type:Concrete
Known malware family with identified signatures
Variant:SI
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 .NET (Microsoft Intermediate Language) platform, family FormBook

Summary:

This is a detection for the FormBook infostealer trojan, a common malware family designed to steal sensitive information. The threat was delivered via a malicious document that used PowerShell to execute its payload, enabling it to steal credentials from browsers, capture keystrokes, and exfiltrate data.

Severity:
Medium
VDM Static Detection:
No detailed analysis available from definition files.
Known malware which is associated with this threat:
e4ec8eb8a0729479977a73c132dd2bdf4dac30483c590f3dd29af60e48ce0ebb
10/11/2025
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the affected machine from the network. Use antivirus to perform a full scan and remove all detected components. Since FormBook is an infostealer, reset all passwords for the user account and any credentials stored on the system. Investigate the initial access vector, likely a phishing email with a malicious attachment, and delete it.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 10/11/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊