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

Backdoor:Linux/Gafgyt.A!MTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Backdoor:Linux/Gafgyt.A!MTB
Classification:
Type:Backdoor
Platform:Linux
Family:Gafgyt
Detection Type:Concrete
Known malware family with identified signatures
Variant:A
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 Gafgyt

Summary:

This detection identifies Backdoor:Linux/Gafgyt.A, a Linux-based Gafgyt botnet variant primarily used for Distributed Denial of Service (DDoS) attacks. The malware establishes remote control, enabling it to execute commands such as 'KILLALL' and participate in various flood attacks, likely communicating with attacker infrastructure indicated by strings like 'dayzddos.co'.

Severity:
Critical
VDM Static Detection:
Relevant strings associated with this threat:
 - |#d1e49aac-8f56-4280-b9ba-993a6d77406c (NID)
 - }#d1e49aac-8f56-4280-b9ba-993a6d77406c (NID)
 - &|#b2b3f03d-6a65-4f7b-a9c7-1c7ef74a9ba4 (NID)
 - &}#b2b3f03d-6a65-4f7b-a9c7-1c7ef74a9ba4 (NID)
 - y*|#56a863a9-875e-4185-98a7-b882c64b5ce5 (NID)
 - y*}#56a863a9-875e-4185-98a7-b882c64b5ce5 (NID)
 - C|#be9ba2d9-53ea-4cdc-84e5-9b1eeee46550 (NID)
 - C}#be9ba2d9-53ea-4cdc-84e5-9b1eeee46550 (NID)
 - L|#3b576869-a4ec-4529-8536-b80a7769e899 (NID)
 - L}#3b576869-a4ec-4529-8536-b80a7769e899 (NID)
 - |#5beb7efe-fd9a-4556-801d-275e5ffc04cc (NID)
 - }#5beb7efe-fd9a-4556-801d-275e5ffc04cc (NID)
 - |#01443614-cd74-433a-b99e-2ecdc07bfc25 (NID)
 - }#01443614-cd74-433a-b99e-2ecdc07bfc25 (NID)
 - |#d3e037e1-3eb8-44c8-a917-57927947596d (NID)
 - }#d3e037e1-3eb8-44c8-a917-57927947596d (NID)
 - |#7674ba52-37eb-4a4f-a9a1-f0f9a1619a2c (NID)
 - }#7674ba52-37eb-4a4f-a9a1-f0f9a1619a2c (NID)
 - |#92e97fa1-2edf-4476-bdd6-9dd0b4dddc7b (NID)
 - }#92e97fa1-2edf-4476-bdd6-9dd0b4dddc7b (NID)
YARA Rule:
rule Backdoor_Linux_Gafgyt_A_2147755852_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Backdoor:Linux/Gafgyt.A!MTB"
        threat_id = "2147755852"
        type = "Backdoor"
        platform = "Linux: Linux platform"
        family = "Gafgyt"
        severity = "Critical"
        info = "MTB: Microsoft Threat Behavior"
        signature_type = "SIGNATURE_TYPE_ELFHSTR_EXT"
        threshold = "4"
        strings_accuracy = "High"
    strings:
        $x_1_1 = "/x54/x53/x6f/x75/x72/x63/x65/x20/x45/x6e/x67/x69/x6e/x65/x20/x51/x75/x65/x72/x79" ascii //weight: 1
        $x_1_2 = "KILLALL" ascii //weight: 1
        $x_1_3 = "botname:" ascii //weight: 1
        $x_2_4 = "dayzddos.co" ascii //weight: 2
        $x_1_5 = "vseattack" ascii //weight: 1
        $x_1_6 = "stdhexflood" ascii //weight: 1
        $x_1_7 = "lololololol" ascii //weight: 1
    condition:
        (filesize < 20MB) and
        (
            ((4 of ($x_1_*))) or
            ((1 of ($x_2_*) and 2 of ($x_1_*))) or
            (all of ($x*))
        )
}
Known malware which is associated with this threat:
Filename: x-8.6-.Sakura
6117c1fd134fa59038b6083dff53b3abf96d905c5cc539bd20d81ee65b05d337
30/12/2025
→VirusTotal↓Download Sample
Filename: m-i.p-s.Sakura
3b41d5897af75ecb0e472feb6842b7e9248940a4d57316200fccc8cc3c6eb26c
30/12/2025
→VirusTotal↓Download Sample
Filename: s-h.4-.Sakura
68130f1e728fb1ccdf4a72f5079dfe89ed69853bb6921ab8199c51c980e7c66e
30/12/2025
→VirusTotal↓Download Sample
Filename: a-r.m-6.Sakura
8580c80f10da60cdbd8860ef2a9ef07092b389c249994d6beb73e5cbcb11b498
30/12/2025
→VirusTotal↓Download Sample
Filename: p-p.c-.Sakura
9847bf04f2a15ba75ec019d3def6a104556d6f07be19fe1548115ed8cd2a0d5c
30/12/2025
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the affected Linux system from the network. Use updated security software to scan for and remove the Gafgyt malware. Subsequently, patch all system vulnerabilities, update credentials for all accounts on the compromised system, and implement network segmentation and egress filtering to block potential command-and-control (C2) communications.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 12/12/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊