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

Backdoor:Linux/Mirai!MSR - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Backdoor:Linux/Mirai!MSR
Classification:
Type:Backdoor
Platform:Linux
Family:Mirai
Detection Type:Concrete
Known malware family with identified signatures
Suffix:!MSR
High-priority threat flagged by Microsoft Security Response
Confidence:Very High
False-Positive Risk:Low

Concrete signature match: Backdoor - Provides unauthorized remote access for Linux platform, family Mirai

Summary:

This is a concrete detection of a Mirai variant backdoor targeting Linux systems, designed to turn compromised devices into bots for malicious activities like DDoS attacks. It leverages capabilities for remote command execution, SQL injection (likely for propagation), and communicates with command-and-control servers to download payloads and receive instructions.

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)
Known malware which is associated with this threat:
Filename: i486
9a836af038f270dc26adad7a0ec58293c079cfdd9212db550cca495148aa6580
30/12/2025
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the infected Linux device from the network. Perform a factory reset or reimage the device's operating system to ensure complete removal. Change all default and weak credentials. Patch all known vulnerabilities, especially for exposed services, and implement strong network segmentation and firewall rules to restrict external access to IoT devices.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 30/12/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
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