user@threatcheck.sh ~ threat-analysis
bash
$ analyze-threat Trojan:Win64/LummaStealer.ARR!MTB
Trojan:Win64/LummaStealer.ARR!MTB - Windows Defender threat signature analysis

Trojan:Win64/LummaStealer.ARR!MTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Trojan:Win64/LummaStealer.ARR!MTB
Classification:
Type:Trojan
Platform:Win64
Family:LummaStealer
Detection Type:Concrete
Known malware family with identified signatures
Variant:ARR
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 64-bit Windows platform, family LummaStealer

Summary:

This detection identifies LummaStealer, a potent information-stealing trojan designed to exfiltrate sensitive data from compromised systems. It targets browser credentials, system information, and cryptocurrency wallets. The '!MTB' suffix indicates this was identified through machine learning-based behavioral analysis, which has a low false positive risk.

Severity:
Medium
VDM Static Detection:
No specific strings found for this threat
YARA Rule:
rule Trojan_Win64_LummaStealer_ARR_2147957815_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Trojan:Win64/LummaStealer.ARR!MTB"
        threat_id = "2147957815"
        type = "Trojan"
        platform = "Win64: Windows 64-bit platform"
        family = "LummaStealer"
        severity = "Critical"
        info = "MTB: Microsoft Threat Behavior"
        signature_type = "SIGNATURE_TYPE_PEHSTR_EXT"
        threshold = "50"
        strings_accuracy = "Low"
    strings:
        $x_50_1 = {f3 41 0f 6f 02 49 83 c2 ?? 66 0f fc c1 41 0f 11 42 f0 49 39 c2 75}  //weight: 50, accuracy: Low
        $x_20_2 = {f3 0f 6f 0a 48 83 c2 ?? 66 0f 6f c1 66 0f 71 f0}  //weight: 20, accuracy: Low
        $x_30_3 = {41 f6 20 49 83 c0 ?? 41 88 40 ff 49 39 c8 75}  //weight: 30, accuracy: Low
    condition:
        (filesize < 20MB) and
        (
            ((1 of ($x_30_*) and 1 of ($x_20_*))) or
            ((1 of ($x_50_*))) or
            (all of ($x*))
        )
}
Known malware which is associated with this threat:
Filename: runtime_modern_edge.exe
70dfe5d54ffa3a00287da91d36a9d1a3a19520276816505fa08875c14d8759c7
04/12/2025
→VirusTotal↓Download Sample
Filename: saylen.exe
e13eab84b5d51db02ab19e24a6c7732642ee815ab9df3f0708bbbede257d8ca8
03/12/2025
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the affected system from the network. Perform a full scan with an updated antivirus solution to remove the threat. Change all passwords for any accounts accessed from the machine and monitor them for suspicious activity.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 03/12/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊