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

Trojan:MSIL/Marsilia.SPFV!MTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Trojan:MSIL/Marsilia.SPFV!MTB
Classification:
Type:Trojan
Platform:MSIL
Family:Marsilia
Detection Type:Concrete
Known malware family with identified signatures
Variant:SPFV
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 Marsilia

Summary:

This is a behavioral detection of a Marsilia family Trojan, a type of malware designed to secretly perform malicious actions on systems running .NET applications. Its identification relies on machine learning-driven analysis of suspicious behaviors rather than a specific, unique code signature.

Severity:
Medium
VDM Static Detection:
No specific strings found for this threat
YARA Rule:
rule Trojan_MSIL_Marsilia_SPFV_2147909807_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Trojan:MSIL/Marsilia.SPFV!MTB"
        threat_id = "2147909807"
        type = "Trojan"
        platform = "MSIL: .NET intermediate language scripts"
        family = "Marsilia"
        severity = "Critical"
        info = "MTB: Microsoft Threat Behavior"
        signature_type = "SIGNATURE_TYPE_PEHSTR_EXT"
        threshold = "5"
        strings_accuracy = "Low"
    strings:
        $x_5_1 = {02 07 91 28 ?? ?? ?? 0a 03 6f ?? ?? ?? 0a 07 28 ?? ?? ?? 0a 03 6f ?? ?? ?? 0a 8e 69 5d 91 61 d2 9c 07 17 58 0b}  //weight: 5, accuracy: Low
    condition:
        (filesize < 20MB) and
        (all of ($x*))
}
Known malware which is associated with this threat:
Filename: 230ef2f814ec1801036975f4c5859bf0.exe
781b6211fe7e291d52cf690e3bbb508714f4608aa879cedc2a61199312dff91a
06/01/2026
→VirusTotal↓Download Sample
Remediation Steps:
Isolate the affected system, perform a full system scan with updated antivirus software, and remove all detected threats. Ensure all system software and security patches are up to date.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 06/01/2026. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊