user@threatcheck.sh ~ threat-analysis
bash
$ analyze-threat Trojan:Linux/Pupy.B!MTB
Trojan:Linux/Pupy.B!MTB - Windows Defender threat signature analysis

Trojan:Linux/Pupy.B!MTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Trojan:Linux/Pupy.B!MTB
Classification:
Type:Trojan
Platform:Linux
Family:Pupy
Detection Type:Concrete
Known malware family with identified signatures
Variant:B
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: Trojan - Appears legitimate but performs malicious actions for Linux platform, family Pupy

Summary:

This is a Linux-based Pupy family Trojan, a known open-source remote access tool (RAT). It was detected via machine learning behavioral analysis, indicating suspicious activities consistent with an attacker attempting to gain remote control, execute commands, and potentially exfiltrate data from the compromised system.

Severity:
Medium
VDM Static Detection:
No specific strings found for this threat
YARA Rule:
rule Trojan_Linux_Pupy_B_2147821036_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Trojan:Linux/Pupy.B!MTB"
        threat_id = "2147821036"
        type = "Trojan"
        platform = "Linux: Linux platform"
        family = "Pupy"
        severity = "Critical"
        info = "MTB: Microsoft Threat Behavior"
        signature_type = "SIGNATURE_TYPE_ELFHSTR_EXT"
        threshold = "2"
        strings_accuracy = "Low"
    strings:
        $x_1_1 = {8a 01 3c 09 0f 94 c2 3c 20 0f 94 c0 08 c2 75 ?? 48 89 e0 45 31 c9 c6 84 24 00 11 00 00 00 48 8d 14 38 29 d6 44 8d 04 0e 49 63 d0 48 8d 3c 10}  //weight: 1, accuracy: Low
        $x_1_2 = {88 8c 3c 90 21 00 00 48 ff c7 8a 0e 48 ff c6 80 f9 09 0f 95 c2 80 f9 20 0f 95 c0 84 d0 75 e1 41 8d 34 38 48 63 c7 c6 84 04 90 21 00 00 00 48 63 fe 48 8d 0c 3c eb 03}  //weight: 1, accuracy: High
        $x_1_3 = {48 83 ca ff 48 89 c6 31 c0 fc 48 89 d1 48 89 f7 89 d5 f2 ae 48 f7 d1 48 01 d1 49 39 cf 0f 82 [0-5] 4c 89 f7 e8 [0-5] 4c 89 f7 e8 [0-5] 85 c0 89 c5}  //weight: 1, accuracy: Low
    condition:
        (filesize < 20MB) and
        (2 of ($x*))
}
Known malware which is associated with this threat:
Filename: systemd-journals
fcc21385d72f4f35f3ff38abba7ce729fe602ea6678b8f4dc66d2e62afa20431
19/01/2026
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the affected Linux system from the network, perform a comprehensive scan with an updated EDR solution, and analyze system logs for further malicious activity. Reset all credentials associated with the compromised system and ensure all system patches are up-to-date to address potential vulnerabilities.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 19/01/2026. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊