user@threatcheck.sh ~ threat-analysis
bash
$ analyze-threat Trojan:Win32/MereTam!rfn
Trojan:Win32/MereTam!rfn - Windows Defender threat signature analysis

Trojan:Win32/MereTam!rfn - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Trojan:Win32/MereTam!rfn
Classification:
Type:Trojan
Platform:Win32
Family:MereTam
Detection Type:Concrete
Known malware family with identified signatures
Suffix:!rfn
Specific ransomware family name
Confidence:Very High
False-Positive Risk:Low

Concrete signature match: Trojan - Appears legitimate but performs malicious actions for 32-bit Windows platform, family MereTam

Summary:

Trojan:Win32/MereTam!rfn is a sophisticated Trojan detected with concrete signatures and low false positive risk. It exhibits advanced capabilities including utilizing legitimate Windows utilities (mshta, regsvr32, rundll32, PowerShell, BITS) for execution and evasion, establishing persistence via scheduled tasks, and employing extensive API hooking techniques. The threat is also capable of data encoding, remote file operations, and file deletion, indicating a comprehensive and high-impact compromise.

Severity:
Critical
VDM Static Detection:
Relevant strings associated with this threat:
 - %s\shell\open\%s (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: research_beacon_malcape.vbs
0516272c399062788057a2f1a22ad723a69cf8f71fa237a6b09ece859d794b3d
14/12/2025
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the affected system to prevent further spread. Perform a full, deep scan using updated antivirus software. Manually identify and remove all associated malicious files, registry modifications, scheduled tasks, and any other persistence mechanisms. Monitor network activity for unusual connections and review system logs for signs of further compromise or data exfiltration. Consider reimaging if complete eradication cannot be confirmed.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 14/12/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊