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

Trojan:MSIL/Coinminer.UF!MTB - Windows Defender Threat Analysis

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

Summary:

This threat is a Trojan coinminer targeting the .NET framework, identified through behavioral analysis. It illicitly uses the victim's system resources (CPU/GPU) to mine cryptocurrency, leading to significant performance degradation. The detection indicates the malware likely uses AES decryption and reflection to obfuscate its payload and evade static analysis.

Severity:
Medium
VDM Static Detection:
Relevant strings associated with this threat:
 - buffer (PEHSTR_EXT)
YARA Rule:
rule Trojan_MSIL_Coinminer_UF_2147809031_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Trojan:MSIL/Coinminer.UF!MTB"
        threat_id = "2147809031"
        type = "Trojan"
        platform = "MSIL: .NET intermediate language scripts"
        family = "Coinminer"
        severity = "Critical"
        info = "MTB: Microsoft Threat Behavior"
        signature_type = "SIGNATURE_TYPE_PEHSTR_EXT"
        threshold = "11"
        strings_accuracy = "High"
    strings:
        $x_1_1 = "GetType" ascii //weight: 1
        $x_1_2 = "GetMethod" ascii //weight: 1
        $x_1_3 = "AES_Decryptor" ascii //weight: 1
        $x_1_4 = "TransformFinalBlock" ascii //weight: 1
        $x_1_5 = "ToString" ascii //weight: 1
        $x_1_6 = "FromBase64String" ascii //weight: 1
        $x_1_7 = "GetBytes" ascii //weight: 1
        $x_1_8 = "GetString" ascii //weight: 1
        $x_1_9 = "CreateDecryptor" ascii //weight: 1
        $x_1_10 = {00 62 75 66 66 65 72 00}  //weight: 1, accuracy: High
        $x_1_11 = {00 69 6e 70 75 74 00}  //weight: 1, accuracy: High
    condition:
        (filesize < 20MB) and
        (all of ($x*))
}
Known malware which is associated with this threat:
Filename: XWorm V6.5.exe
afd4bc108d2feb94bb53048f6dbc2b46614629a3d944f14968c978cc49eb6036
01/12/2025
→VirusTotal↓Download Sample
Remediation Steps:
Isolate the affected machine from the network to prevent communication with mining pools. Use Windows Defender to perform a full scan and remove the detected file. Review system startup locations (e.g., Task Scheduler, Run keys) for any persistence mechanisms established by the malware and remove them.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 01/12/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊