Trojan:Linux/Mirai - ThreatCheck.sh

user@threatcheck.sh ~ threat-analysis

bash

$ analyze-threat Trojan:Linux/Mirai

Trojan:Linux/Mirai - Windows Defender threat signature analysis

$ cat analysis.txt

=== THREAT ANALYSIS REPORT ===

Threat Name: Trojan:Linux/Mirai

Classification:

Type:Trojan

Platform:Linux

Family:Mirai

Detection Type:Concrete

Known malware family with identified signatures

Confidence:Very High

False-Positive Risk:Low

Concrete signature match: Trojan - Appears legitimate but performs malicious actions for Linux platform, family Mirai

Summary:

This is a variant of the Mirai botnet malware that compromises Linux-based systems, such as IoT devices and servers. The threat establishes a backdoor to gain remote control, enrolls the device into a botnet for DDoS attacks, and may attempt to spread to or attack other systems on the network.

Severity:

Critical

VDM Static Detection:

Relevant strings associated with this threat:
 - /ver.txt (PEHSTR_EXT)
 - /update.txt (PEHSTR_EXT)
 - http://%s:8888/ (PEHSTR_EXT)
 - \msinfo.exe (PEHSTR_EXT)
 - /delete /f /tn msinfo (PEHSTR_EXT)
 - //%s:8888/ups.rar (PEHSTR_EXT)
 - //%s:8888/wpd.dat (PEHSTR_EXT)
 - //%s:8888/wpdmd5.txt (PEHSTR_EXT)
 - //down2.b5w91.com:8443 (PEHSTR_EXT)
 - /shell?%s (PEHSTR_EXT)
 - ;exec sp_add_jobserver (PEHSTR_EXT)
 - ;EXEC sp_droplogin (PEHSTR_EXT)
 - ;exec(@a); (PEHSTR_EXT)
 - <sip:carol@chicago.com> (PEHSTR_EXT)
 - @name='bat.exe',@freq_type=4,@active_start_date (PEHSTR_EXT)
 - @shell INT EXEC SP_ (PEHSTR_EXT)
 - [Cracker:MSSQL] Host:%s, blindExec CMD: %s (PEHSTR_EXT)
 - [ExecCode] (PEHSTR_EXT)
 - [ExecCode]AUTHORIZATION [dbo] FROM 0x4D5A (PEHSTR_EXT)
 - \Run','rundll32'; (PEHSTR_EXT)
 - C:\Progra~1\kugou2010&attrib (PEHSTR_EXT)
 - C:\Progra~1\mainsoft&attrib (PEHSTR_EXT)
 - C:\Progra~1\shengda&attrib (PEHSTR_EXT)
 - cmd3:[%s] (PEHSTR_EXT)
 - DROP ASSEMBLY ExecCode (PEHSTR_EXT)
 - !#HSTR:StringCodeForMshta.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.C!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.D!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.L!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.O!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForRegsvr32.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForRundll32.A!pli (PEHSTR_EXT)
 - rundll32 (PEHSTR_EXT)
 - !#HSTR:StringCodeForBITSJobs.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForPowerShell.G!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForScheduledTask.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForDataEncoding.D!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.J!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.K!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForRemoteFileCopy.B!pli (PEHSTR_EXT)
 - !#HSTR:ExecutionGuardrails (PEHSTR_EXT)
 - !#HSTR:StringCodeForFileDeletion.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.M!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForNetshHelperDLL.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForRemoteServices.A!pli (PEHSTR_EXT)

YARA Rule:

rule Trojan_Linux_Mirai_2147740141_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Trojan:Linux/Mirai!MTB"
        threat_id = "2147740141"
        type = "Trojan"
        platform = "Linux: Linux platform"
        family = "Mirai"
        severity = "Critical"
        info = "MTB: Microsoft Threat Behavior"
        signature_type = "SIGNATURE_TYPE_ELFHSTR_EXT"
        threshold = "4"
        strings_accuracy = "High"
    strings:
        $x_1_1 = "/bin/busybox ESTELLA" ascii //weight: 1
        $x_1_2 = "chmod 777 .load;" ascii //weight: 1
        $x_1_3 = "killall -9 busybox telnetd" ascii //weight: 1
        $x_1_4 = "echo -e \"/bin/busybox telnetd -p9000 -l/bin/sh" ascii //weight: 1
    condition:
        (filesize < 20MB) and
        (all of ($x*))
}

Known malware which is associated with this threat:

Filename: xd.x86

4a99f4802d4a7c8db9f9f8c5cd07d9f650f5693fa2d42cc16eea44a564318836

28/01/2026

→VirusTotal ↓Download Sample

Filename: vcimanagement.arm7

19da22b5025a9a9b7c29fc14a2205b0a6458bd13b0ebfad0077b7ca0feb29ff8

22/01/2026

→VirusTotal ↓Download Sample

Filename: UnHAnaAW.arm7

6012b94a2e7e1c86a8184ecb88b8f295f037a87a3268fd357597a0b39f6cdef4

21/01/2026

→VirusTotal ↓Download Sample

Filename: vcimanagement.arm7

c80c6228ca08007ae6de2fadd86fc12aa75f2f1c96eb3c2e429da1cef3fedffa

17/01/2026

→VirusTotal ↓Download Sample

Filename: UnHAnaAW.arm7

99e33c5f3bcc871734d738567c607b66dec14bf482805ceb10921a531da881e0

15/01/2026

→VirusTotal ↓Download Sample

Remediation Steps:

Immediately isolate the infected device from the network to prevent lateral movement and C2 communication. Re-image the system or perform a factory reset, then immediately change all default credentials. Ensure the device is fully patched and harden its configuration by disabling unnecessary services like Telnet.

=== END REPORT ===

$ reanalyze-threat

This analysis was last updated on 21/11/2025. Do you want to analyze it again?

$ ls available-commands/

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Trojan:Linux/Mirai - Windows Defender Threat Analysis