user@threatcheck.sh ~ threat-analysis
bash
$ analyze-threat Backdoor:Linux/Gafgyt.BY!xp
Backdoor:Linux/Gafgyt.BY!xp - Windows Defender threat signature analysis

Backdoor:Linux/Gafgyt.BY!xp - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Backdoor:Linux/Gafgyt.BY!xp
Classification:
Type:Backdoor
Platform:Linux
Family:Gafgyt
Detection Type:Concrete
Known malware family with identified signatures
Variant:BY
Specific signature variant within the malware family
Suffix:!xp
Confidence:Very High
False-Positive Risk:Low

Concrete signature match: Backdoor - Provides unauthorized remote access for Linux platform, family Gafgyt

Summary:

Backdoor:Linux/Gafgyt.BY!xp is a concrete detection for a variant of the Gafgyt botnet malware targeting Linux systems. This threat establishes a backdoor, enabling attackers to gain unauthorized remote access and control over the compromised device. Gafgyt typically enrolls compromised devices into a botnet, commonly used for launching Distributed Denial of Service (DDoS) attacks.

Severity:
Critical
VDM Static Detection:
No specific strings found for this threat
YARA Rule:
rule Backdoor_Linux_Gafgyt_BY_2147819253_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Backdoor:Linux/Gafgyt.BY!xp"
        threat_id = "2147819253"
        type = "Backdoor"
        platform = "Linux: Linux platform"
        family = "Gafgyt"
        severity = "Critical"
        info = "xp: an internal category used to refer to some threats"
        signature_type = "SIGNATURE_TYPE_ELFHSTR_EXT"
        threshold = "2"
        strings_accuracy = "High"
    strings:
        $x_1_1 = {30 c2 e5 10 30 1b e5 00 30 93 e5 01 20 83 e2 10 30 1b e5 00 20 83 e5 04 00 00}  //weight: 1, accuracy: High
        $x_1_2 = {30 1b e5 00 00 53 e3 0a 00 00 0a 28 30 1b e5 0a 00 53 e3 07}  //weight: 1, accuracy: High
    condition:
        (filesize < 20MB) and
        (all of ($x*))
}
Known malware which is associated with this threat:
Filename: armv6l
3b46920ed73007e9efb9dea40530eb3dd980e70a2be26e0f890351c94cd5c299
07/12/2025
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the affected Linux system from the network. Employ a reputable antivirus/EDR solution to scan and remove the Gafgyt malware and any associated persistence mechanisms. Patch all system vulnerabilities, update software, and reset all credentials to strong, unique passwords. Implement continuous monitoring for unusual activity.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 07/12/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊