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

Backdoor:Linux/ConnectBack.A!xp - Windows Defender Threat Analysis

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

Summary:

This is a concrete detection of a Linux backdoor from the ConnectBack family. The malware establishes a reverse shell or command-and-control connection to an attacker, granting remote access and control over the compromised Linux system.

Severity:
Critical
VDM Static Detection:
No specific strings found for this threat
YARA Rule:
rule Backdoor_Linux_ConnectBack_A_2147794759_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Backdoor:Linux/ConnectBack.A!xp"
        threat_id = "2147794759"
        type = "Backdoor"
        platform = "Linux: Linux platform"
        family = "ConnectBack"
        severity = "Critical"
        info = "xp: an internal category used to refer to some threats"
        signature_type = "SIGNATURE_TYPE_ELFHSTR_EXT"
        threshold = "1"
        strings_accuracy = "Low"
    strings:
        $x_1_1 = {31 db f7 e3 53 43 53 6a 02 b0 66 89 e1 cd 80 97 5b 68 ?? ?? ?? ?? 68 02 00 ?? ?? 89 e1 6a 66 58 50 51 57 89 e1 43 cd 80 85 c0 79 19 4e 74 3d 68 a2 00 00 00 58 6a 00 6a 05 89 e3 31 c9 cd 80 85 c0 79 bd eb 27}  //weight: 1, accuracy: Low
        $x_1_2 = {48 b9 02 00 ?? ?? ?? ?? ?? ?? 51 48 89 e6 6a 10 5a 6a 2a 58 0f 05 59 48 85 c0 79 25 49 ff c9 74 18 57 6a 23 58 6a 00 6a 05 48 89 e7 48 31 f6 0f 05 59 59 5f 48 85 c0 79 c7 6a 3c 58 6a 01 5f 0f 05 5e 6a 7e 5a 0f 05 48 85 c0 78 ed ff e6}  //weight: 1, accuracy: Low
    condition:
        (filesize < 20MB) and
        (1 of ($x*))
}
Known malware which is associated with this threat:
Filename: lucifer.elf
144fe30644aff6701bc543e745e174d1be4bbece84688cc8dcabd5ee4497fe50
18/11/2025
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the affected Linux system, perform a comprehensive security scan to remove the backdoor, and investigate for persistence or further compromise. Consider rebuilding the system if the extent of compromise is unclear.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 18/11/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊