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

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

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Backdoor:Linux/Mirai.GR!MTB
Classification:
Type:Backdoor
Platform:Linux
Family:Mirai
Detection Type:Concrete
Known malware family with identified signatures
Variant:GR
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 (GR) of the Mirai botnet family on Linux platforms, confirmed by a concrete signature and behavioral analysis (!MTB). Mirai typically compromises IoT devices and servers, turning them into bots for large-scale Distributed Denial of Service (DDoS) attacks and other malicious activities, acting as a backdoor for remote control.

Severity:
Critical
VDM Static Detection:
No specific strings found for this threat
YARA Rule:
rule Backdoor_Linux_Mirai_GR_2147910129_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Backdoor:Linux/Mirai.GR!MTB"
        threat_id = "2147910129"
        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 = {05 00 1c 3c f4 84 9c 27 21 e0 99 03 d0 ff bd 27 28 00 bf af 10 00 bc af 5c 80 99 8f 18 00 a4 af 1c 00 a5 af 20 00 a6 af 06 10 04 24 18 00 a6 27 09 f8 20 03 03 00 05 24 10 00 bc 8f 28 00 bf 8f ?? ?? ?? ?? 08 00 e0 03 30 00 bd 27}  //weight: 1, accuracy: Low
        $x_1_2 = {05 00 1c 3c 1c 85 9c 27 21 e0 99 03 21 10 a0 00 5c 80 99 8f 21 38 c0 00 21 28 80 00 21 30 40 00 08 00 20 03 a5 0f 04 24}  //weight: 1, accuracy: High
    condition:
        (filesize < 20MB) and
        (all of ($x*))
}
Known malware which is associated with this threat:
Filename: dlr.mpsl
a7cafa72a972325d0c6322d2b143e89f2afd612436667001c45a41efd62c58e7
15/01/2026
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the infected Linux system from the network to prevent further compromise or participation in botnet activities. Conduct a full system scan with updated security software, remove all detected malicious files, and patch any known vulnerabilities (especially default or weak credentials common in Mirai infections). Implement strong password policies, disable unnecessary services, and monitor network traffic for suspicious activity.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 15/01/2026. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊