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

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

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Backdoor:Linux/Mirai.BU!MTB
Classification:
Type:Backdoor
Platform:Linux
Family:Mirai
Detection Type:Concrete
Known malware family with identified signatures
Variant:BU
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 Backdoor:Linux/Mirai.BU, a variant of the notorious Mirai botnet that targets Linux-based IoT devices. It acts as a backdoor, enabling attackers to gain remote control and often enlist the device in large-scale Distributed Denial of Service (DDoS) attacks. The detection is concrete and incorporates behavioral analysis.

Severity:
Critical
VDM Static Detection:
No specific strings found for this threat
YARA Rule:
rule Backdoor_Linux_Mirai_BU_2147822821_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Backdoor:Linux/Mirai.BU!MTB"
        threat_id = "2147822821"
        type = "Backdoor"
        platform = "Linux: Linux platform"
        family = "Mirai"
        severity = "Critical"
        info = "MTB: Microsoft Threat Behavior"
        signature_type = "SIGNATURE_TYPE_ELFHSTR_EXT"
        threshold = "3"
        strings_accuracy = "High"
    strings:
        $x_2_1 = {8b 5c 0a 04 0f b7 43 2c 8b 53 1c 66 85 c0 0f b7 f8 0f 84 bd 00 00 00 0f b7 73 2a 01 da 31 c9 31 ed c7 44 24 0c ff ff ff ff}  //weight: 2, accuracy: High
        $x_1_2 = "/dev/watchdog" ascii //weight: 1
        $x_1_3 = "/dev/misc/watchdog" ascii //weight: 1
    condition:
        (filesize < 20MB) and
        (
            ((1 of ($x_2_*) and 1 of ($x_1_*))) or
            (all of ($x*))
        )
}
Known malware which is associated with this threat:
Filename: i486
5ff3c45bba93b2c297d9644a93a751a7be92ab99699964b871f28edbc3c09404
14/01/2026
→VirusTotal↓Download Sample
Filename: i486
bde8f13fae659528196f1f8e322b5e06602ec726968d101100fad5d6029b5986
13/01/2026
→VirusTotal↓Download Sample
Filename: i486
b6a71c77d52ab80bbb5a8e6c15b530eba6047d1ea33aa90ea6d8d2ff4ef0e1f5
09/01/2026
→VirusTotal↓Download Sample
Filename: i486
27187ee10725de38744560c8da31a00dfaefb19d08fb476897c0427421ae226a
16/12/2025
→VirusTotal↓Download Sample
Filename: i486
3d54abfa620509fc0b06fff94ece35322c8ff8d76aeb512dae3371538ef4c5d2
11/12/2025
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the infected Linux device from the network. Remove the malware by reflashing the device firmware or reinstalling the operating system. Strengthen credentials by changing all default or weak passwords, patch systems for known vulnerabilities, and implement network segmentation to prevent further compromise.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 11/12/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊