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

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

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Backdoor:Linux/Mirai.FK!MTB
Classification:
Type:Backdoor
Platform:Linux
Family:Mirai
Detection Type:Concrete
Known malware family with identified signatures
Variant:FK
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 threat is a Backdoor:Linux/Mirai.FK variant, designed to infect Linux systems and establish unauthorized remote access. It aims to incorporate compromised devices into a botnet, primarily for launching Distributed Denial of Service (DDoS) attacks. The detection leverages concrete signatures combined with high-confidence machine learning behavioral analysis.

Severity:
Critical
VDM Static Detection:
No specific strings found for this threat
YARA Rule:
rule Backdoor_Linux_Mirai_FK_2147906316_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Backdoor:Linux/Mirai.FK!MTB"
        threat_id = "2147906316"
        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 = {60 30 9f e5 00 00 53 e3 03 ?? ?? ?? 0f e0 a0 e1 03 f0 a0 e1 00 30 a0 e3 00 30 80 e5 18 30 9f e5 06 10 a0 e1 00 20 93 e5 08 00 a0 e1 0f e0 a0 e1 0a f0 a0 e1 83 fe ff eb}  //weight: 1, accuracy: Low
        $x_1_2 = {0f 00 00 0a 01 c0 53 e2 0d ?? ?? ?? 02 0b 1e e3 0b ?? ?? ?? 01 00 5c e3 21 ?? ?? ?? 28 30 ?? e5 00 00 53 e3 1e ?? ?? ?? 03 30 d0 e5 2c 20 ?? e5 0c 30 63 e0 00 00 52 e3 01 c0 43 e2 02 30 d0 c5 0c c0 63 c0}  //weight: 1, accuracy: Low
    condition:
        (filesize < 20MB) and
        (all of ($x*))
}
Known malware which is associated with this threat:
Filename: harm5
76effea754608186d10ca3f39b893eb06919d276614cb0c389f57920ed44aa4b
20/01/2026
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the affected Linux system from the network. Perform a full system scan and thoroughly remove all identified Mirai components. Implement robust security practices, including patching vulnerabilities, enforcing strong access controls, and network segmentation to prevent future infections.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 20/01/2026. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊