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

Backdoor:Linux/Mirai.JL!MTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Backdoor:Linux/Mirai.JL!MTB
Classification:
Type:Backdoor
Platform:Linux
Family:Mirai
Detection Type:Concrete
Known malware family with identified signatures
Variant:JL
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 Mirai

Summary:

This detection identifies a specific variant (JL) of the Mirai botnet targeting Linux systems, using both concrete signatures and machine learning behavioral analysis (!MTB). Mirai malware is known for compromising IoT devices and Linux servers, turning them into bots for launching large-scale Distributed Denial of Service (DDoS) attacks, often coupled with backdoor capabilities for remote access and control.

Severity:
Critical
VDM Static Detection:
No specific strings found for this threat
YARA Rule:
rule Backdoor_Linux_Mirai_JL_2147919522_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Backdoor:Linux/Mirai.JL!MTB"
        threat_id = "2147919522"
        type = "Backdoor"
        platform = "Linux: Linux platform"
        family = "Mirai"
        severity = "Critical"
        info = "MTB: Microsoft Threat Behavior"
        signature_type = "SIGNATURE_TYPE_ELFHSTR_EXT"
        threshold = "2"
        strings_accuracy = "Low"
    strings:
        $x_1_1 = {00 54 28 21 00 53 20 21 02 15 10 2a 02 40 30 21 24 07 40 00 10 ?? ?? ?? 26 10 00 01 8c 84 00 00 8c a5 00 00 02 20 c8 21 03 20 f8 09 00 00 00 00 8f bc 00 10 10 ?? ?? ?? 00 10 10 80}  //weight: 1, accuracy: Low
        $x_1_2 = {30 c3 00 ff 24 62 ff d0 30 42 00 ff 2c 42 00 0a 14 ?? ?? ?? 24 62 ff bf 30 42 00 ff 2c 42 00 1a 10 ?? ?? ?? 24 62 ff 9f 24 02 00 37 10 ?? ?? ?? 00 c2 18 23}  //weight: 1, accuracy: Low
    condition:
        (filesize < 20MB) and
        (all of ($x*))
}
Known malware which is associated with this threat:
Filename: b2
b1ad8f75d8ca1ed287e2e191fc613b1a7bb60dee51b59384ecbd750c84dff7de
17/11/2025
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the infected Linux system from the network to prevent further compromise and botnet activity. Perform a full system scan with updated security software to identify and eradicate the Mirai malware. Investigate the initial compromise vector, which often includes weak credentials (e.g., default IoT passwords) or unpatched vulnerabilities, and then apply necessary security patches, strengthen password policies, and disable unnecessary services to prevent re-infection.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 17/11/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊