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

Trojan:Linux/SSHDoor.F!MTB - Windows Defender Threat Analysis

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

Summary:

This detection identifies a Linux Trojan from the SSHDoor family, specifically variant F, which likely establishes persistent remote access via SSH. It is detected using concrete binary patterns in conjunction with machine learning behavioral analysis, indicating a high-confidence threat.

Severity:
Critical
VDM Static Detection:
No specific strings found for this threat
YARA Rule:
rule Trojan_Linux_SSHDoor_F_2147926258_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Trojan:Linux/SSHDoor.F!MTB"
        threat_id = "2147926258"
        type = "Trojan"
        platform = "Linux: Linux platform"
        family = "SSHDoor"
        severity = "Critical"
        info = "MTB: Microsoft Threat Behavior"
        signature_type = "SIGNATURE_TYPE_ELFHSTR_EXT"
        threshold = "2"
        strings_accuracy = "High"
    strings:
        $x_1_1 = {56 d3 03 b6 95 78 9e 7c 1c c4 2c 19 86 7e 6a 9e be f8 df 0f 3f 7e 96 7c c3 3b 79 1c a1 9f a9 0f 43 66 4b 10 9e fb 6e 0f a2 5a ef 90 f9 2c 58 be 41 4d 9d 7c 25 a7 1b e0 a7 9b 93 1c d1 5f 39 0f be 86 ef 0e b9 2b 6b 15 3a 0d 85 b3 50 b5 a8 10 cf 4a ae ff 08 2c ae ff cb 44 77 12 4e 69 da b0 11 89 99 7c 71 93 c5 ba 52 8c 28 21 01 23 f9 a4 ea 3d 9d 7c f9 6b 2e 8c 60 98 ef 12 49 eb db 08 cf da 93 1c 38 40 0c af 6a 65 5d 14 19 dc 77 89 0b 0f b5 a5 7d 1b 76}  //weight: 1, accuracy: High
        $x_1_2 = {66 49 49 22 c5 9f 2c fc 25 56 36 64 12 16 01 a9 ef 21 63 0f 8e 68 b0 6e bc 8b a8 af 81 74 82 0d 46 a4 81 10 6a f6 a3 b6 40 8f 1d fd 7b c7 54 d2 86 23 b6 b1 57 db 93 1c b5 e9 5a f1 36 15 15 65 72 47 9c 7c 84 9b 87 ff 95 b1 5d e0 b3 15 9a 7c 9a 91 08 ff e4 9e e0 ff 97 2b 26 fe c0 e5 95 7c d3 33 b2 a3 28 aa 3f 7e d6 0e 3f 0f 05 50 85 1b 26 76 fa 3b ef 0b 51 f9 be 27 15 36 d8 ec 70 ac 67 55 61 10}  //weight: 1, accuracy: High
        $x_1_3 = {11 0f 7d 60 9c 7c 0c df 03 ab ae 60 87 ff e6 65 84 ba ac 3a 80 0f e9 44 6d 77 cf 38 39 0f 30 20 fe 0f 4e 88 e0 09 19 d1 78 85 6a 4e c2 ba e3 ad c6 1b ef b7 06 1e 20 cf 09 fd 94 19 68 f6 c5 b9 9c 40 5c c0 09 3e 55 cc 0a 83 56 33 66 0f 47 01 75 0f 26 21 67 69 b1 b0 a8 94 8f f5 c8 87 e4 de 93 1c 2a 9e 07 fd 51 ee 11 e3 ad 70 0e af fe ec 84 14 d2 74}  //weight: 1, accuracy: High
    condition:
        (filesize < 20MB) and
        (2 of ($x*))
}
Known malware which is associated with this threat:
Filename: sshd
11a87cdc3dd4e4d01208493d911d35afb6cba0098562236296526fa9e9e54b67
02/01/2026
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the compromised Linux system from the network. Conduct a thorough forensic investigation to identify the infection vector and any data exfiltration. Scan the system with updated security software, review SSH configurations, authorized_keys files, and audit logs for unauthorized access. Revoke and reset all credentials, especially for administrative accounts. Patch all system vulnerabilities and consider re-imaging the system if the extent of compromise cannot be fully determined.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 02/01/2026. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊