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

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

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Backdoor:Linux/Mirai.FS!MTB
Classification:
Type:Backdoor
Platform:Linux
Family:Mirai
Detection Type:Concrete
Known malware family with identified signatures
Variant:FS
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 backdoor from the Mirai malware family on a Linux system, likely within the Windows Subsystem for Linux (WSL). The malware adds the compromised host to a botnet, which then scans for other vulnerable systems and participates in large-scale DDoS attacks.

Severity:
Medium
VDM Static Detection:
No specific strings found for this threat
YARA Rule:
rule Backdoor_Linux_Mirai_FS_2147906074_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Backdoor:Linux/Mirai.FS!MTB"
        threat_id = "2147906074"
        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 = {95 31 20 08 9a 10 40 0d 99 36 20 08 92 53 40 1a 91 40 00 00 85 3e a0 1f 96 82 40 0a 82 5b 00 1a 84 58 80 0d 82 00 40 02 ?? 00 40 08 03 00 3f ff 94 42 20 00 82 10 63 ff 80 a2 80 01}  //weight: 1, accuracy: Low
        $x_1_2 = {d4 22 60 08 80 a2 a0 00 02 ?? ?? ?? d6 22 60 04 10 ?? ?? ?? d2 22 a0 04 d2 22 00 00}  //weight: 1, accuracy: Low
    condition:
        (filesize < 20MB) and
        (all of ($x*))
}
Known malware which is associated with this threat:
Filename: spc
9556672eaf1573720fe806ce034899a820d1eb9799fae9733e8673c639c214da
15/11/2025
→VirusTotal↓Download Sample
Filename: spc
1bbc2546e4dbd1b9c37d32ad43a8d81f3a077d01141aae13f77aa334709c9f2a
13/11/2025
→VirusTotal↓Download Sample
Filename: spc
8e34051509727e85abb11d3bf90891b24948de11759fe3302ef5bf915d7ce7e3
13/11/2025
→VirusTotal↓Download Sample
Filename: spc
7c5873069caf360023e37be06ffa9fbe52cb4d55f626b98a3ef32cae934b4376
11/11/2025
→VirusTotal↓Download Sample
fc5f410ff368910037e8ca73cd9024694eea4083af51990892a44b57938c6bf5
10/11/2025
→VirusTotal↓Download Sample
Remediation Steps:
Isolate the host from the network. Investigate running processes within any Linux environments (WSL, containers) to identify and terminate the threat. Remove the associated malware files and change all credentials to strong, unique passwords to prevent reinfection.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 08/11/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊