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

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

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Backdoor:Linux/Mirai.FN!MTB
Classification:
Type:Backdoor
Platform:Linux
Family:Mirai
Detection Type:Concrete
Known malware family with identified signatures
Variant:FN
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 is a concrete detection of Backdoor:Linux/Mirai.FN, a variant of the notorious Mirai botnet family specifically targeting Linux-based devices. It acts as a backdoor, granting unauthorized remote access to the compromised system, likely to enroll it into a botnet for Distributed Denial of Service (DDoS) attacks or other malicious operations.

Severity:
Medium
VDM Static Detection:
No specific strings found for this threat
YARA Rule:
rule Backdoor_Linux_Mirai_FN_2147906072_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Backdoor:Linux/Mirai.FN!MTB"
        threat_id = "2147906072"
        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 = {18 30 a0 e3 92 a3 28 e0 00 30 d4 e5 b0 30 c3 e3 40 30 83 e3 00 30 c4 e5 09 e8 a0 e1 00 30 d4 e5 42 c8 8e e2 2c 24 a0 e1}  //weight: 1, accuracy: High
        $x_1_2 = {05 00 51 e1 05 10 a0 21 00 30 d6 e5 0a 00 53 e3 01 60 86 e2 00 30 c2 e5 02 ?? ?? ?? b0 30 d4 e1 01 0c 13 e3}  //weight: 1, accuracy: Low
    condition:
        (filesize < 20MB) and
        (all of ($x*))
}
Known malware which is associated with this threat:
Filename: arm7
9c397da25e636271ffcf2c433d43cbafb1e58f98af1b081297c423a4eb5790a2
30/01/2026
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the infected Linux device from the network to prevent further compromise or spread. Remove the detected malware and ensure all system and application vulnerabilities are patched. Reset all credentials associated with the device, especially default or weak ones, and implement strong access controls and network segmentation.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 30/01/2026. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊