user@threatcheck.sh ~ threat-analysis
bash
$ analyze-threat Backdoor:Linux/Gafgyt.BI!MTB
Backdoor:Linux/Gafgyt.BI!MTB - Windows Defender threat signature analysis

Backdoor:Linux/Gafgyt.BI!MTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Backdoor:Linux/Gafgyt.BI!MTB
Classification:
Type:Backdoor
Platform:Linux
Family:Gafgyt
Detection Type:Concrete
Known malware family with identified signatures
Variant:BI
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: Backdoor - Provides unauthorized remote access for Linux platform, family Gafgyt

Summary:

This threat is a backdoor from the Gafgyt malware family, which targets Linux systems and IoT devices. It is designed to add the compromised device to a botnet for use in Distributed Denial-of-Service (DDoS) attacks. The '!MTB' suffix indicates detection by a machine learning behavioral model, identifying activity consistent with this malware.

Severity:
Medium
VDM Static Detection:
No specific strings found for this threat
YARA Rule:
rule Backdoor_Linux_Gafgyt_BI_2147818541_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Backdoor:Linux/Gafgyt.BI!MTB"
        threat_id = "2147818541"
        type = "Backdoor"
        platform = "Linux: Linux platform"
        family = "Gafgyt"
        severity = "Critical"
        info = "MTB: Microsoft Threat Behavior"
        signature_type = "SIGNATURE_TYPE_ELFHSTR_EXT"
        threshold = "2"
        strings_accuracy = "Low"
    strings:
        $x_1_1 = {8b 45 0c 8a 00 25 ff 00 00 00 83 ec 08 50 ff 75 08 e8 [0-5] 83 c4 10 ff 45 f0 ff 45 0c 8b 45 0c 8a 00 84 c0}  //weight: 1, accuracy: Low
        $x_1_2 = {83 ec 08 ff 75 f4 ff 75 08 e8 [0-5] 83 c4 10 ff 45 f0 ff 4d 10 83 7d 10 00 7f [0-3] 8b 45 f0 c9 c3}  //weight: 1, accuracy: Low
    condition:
        (filesize < 20MB) and
        (all of ($x*))
}
Known malware which is associated with this threat:
Filename: SecuriteInfo.com.Linux.Siggen.1140.8404.28482
6f0ef8347bc224ca65fa15567f8ba5b3c47a7a5524db4ef606f4686e850e1f09
20/11/2025
→VirusTotal↓Download Sample
Remediation Steps:
Isolate the compromised system from the network immediately. Identify and delete the malicious file and terminate any related processes. Change all credentials, remove any persistence mechanisms (e.g., cron jobs, startup scripts), and apply all available security patches to prevent reinfection.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 20/11/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊