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

Trojan:Win64/Stealc.GA!MTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Trojan:Win64/Stealc.GA!MTB
Classification:
Type:Trojan
Platform:Win64
Family:Stealc
Detection Type:Concrete
Known malware family with identified signatures
Variant:GA
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 Stealc

Summary:

This threat is a trojan from the Stealc info-stealer family, designed to steal sensitive data from an infected system. It targets information such as browser credentials, cookies, cryptocurrency wallets, and other personal files. The '!MTB' suffix indicates this specific detection was made by Microsoft's machine learning-based behavioral analysis, which identified the file's malicious actions.

Severity:
Medium
VDM Static Detection:
No specific strings found for this threat
YARA Rule:
rule Trojan_Win64_Stealc_GA_2147939347_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Trojan:Win64/Stealc.GA!MTB"
        threat_id = "2147939347"
        type = "Trojan"
        platform = "Win64: Windows 64-bit platform"
        family = "Stealc"
        severity = "Critical"
        info = "MTB: Microsoft Threat Behavior"
        signature_type = "SIGNATURE_TYPE_PEHSTR_EXT"
        threshold = "10"
        strings_accuracy = "High"
    strings:
        $x_10_1 = {0f b7 c8 81 e9 19 04 00 00 74 14 83 e9 09 74 0f 83 e9 01 74 0a 83 e9 1c 74 05 83 f9 04 75 08}  //weight: 10, accuracy: High
    condition:
        (filesize < 20MB) and
        (all of ($x*))
}
Known malware which is associated with this threat:
f4584140becea8907edb22c8a99d5e9e9157931aa1e2ab29522adbc9ba684f07
04/12/2025
→VirusTotal↓Download Sample
Filename: 99xc5vk6.exe
b38e57dc8a718b9b9ecb84b8ad7c8fc11c5028e7b9f0eafc1591d5b58c9de9c2
04/12/2025
→VirusTotal↓Download Sample
Filename: 87qo1yp.exe
73420694fb8c75bed7825d4074c596e681f36aa287efaddd60d7370e98abd740
04/12/2025
→VirusTotal↓Download Sample
Filename: 16wsad.exe
3ec41ebc9acb444fee5a1a94dfe97b783972513a0de1899f387b79b7043812e6
04/12/2025
→VirusTotal↓Download Sample
Filename: 5az5d!z.exe
5f14beaba244bd8335e26210102783ffc5d7d49cae2a870342e9e911c26d0da8
04/12/2025
→VirusTotal↓Download Sample
Remediation Steps:
1. Immediately disconnect the affected machine from the network to prevent data exfiltration. 2. Run a full system scan with an updated antivirus tool to remove the threat. 3. Change all critical passwords (email, banking, social media), enable multi-factor authentication (MFA), and monitor accounts for suspicious activity as credentials may have been compromised.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 04/12/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊