user@threatcheck.sh ~ threat-analysis
bash
$ analyze-threat Trojan:Win64/Oyster!MTB
Trojan:Win64/Oyster!MTB - Windows Defender threat signature analysis

Trojan:Win64/Oyster!MTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Trojan:Win64/Oyster!MTB
Classification:
Type:Trojan
Platform:Win64
Family:Oyster
Detection Type:Concrete
Known malware family with identified signatures
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 64-bit Windows platform, family Oyster

Summary:

Trojan:Win64/Oyster!MTB is a malicious downloader detected through behavioral analysis. It connects to Google Drive to download and execute secondary payloads, uses system utilities like rundll32.exe for execution, and may attempt to delete itself to evade detection.

Severity:
High
VDM Static Detection:
Relevant strings associated with this threat:
 - postman\Desktop\NZT\ProjectD_cpprest\CleanUp\Release\CleanUp.pdb (PEHSTR_EXT)
 - EXE (PEHSTR_EXT)
 - rundll32.exe %s,Test (PEHSTR_EXT)
 - COM (PEHSTR_EXT)
 - Loader\CleanUp\Release\CleanUp.pdb (PEHSTR_EXT)
 - NZT\ProjectD_WinInet\CleanUp\Release\CleanUp.pdb (PEHSTR_EXT)
 - )drive.usercontent.google.com/download?id= (PEHSTR)
 - HttpSendRequestA (PEHSTR)
 - ShellExecute (PEHSTR)
 - KERNEL32.DLL (PEHSTR_EXT)
 - postman\Desktop\NZT\ProjectD_cpprest (PEHSTR_EXT)
 - rundll32.exe (PEHSTR)
 - DllRegisterServer (PEHSTR)
 - HttpSendRequestA (PEHSTR_EXT)
 - Del /f /q "%s (PEHSTR_EXT)
 - cmd.exe /C ping  (PEHSTR_EXT)
 - Mutex already exists, another instance is running. (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: TeamsSetup_v7.853.exe
523f54f5b1996c9740919899e5df05292092c5ae9fd0ef633e191a4acfc609e8
03/12/2025
→VirusTotal↓Download Sample
Filename: MSTeamsSetup.exe
6b1251fb7b4f9458922c94f0abd0584fd891860ec12fee5da428b7b6dc1136f0
03/12/2025
→VirusTotal↓Download Sample
Filename: j2pj1twew.exe
4631309051a5943e92656a421a01f79132f47b0367462ee1b9c50f56ab38e04f
18/11/2025
→VirusTotal↓Download Sample
Remediation Steps:
1. Isolate the affected machine from the network immediately. 2. Perform a full system scan with updated antivirus software to remove all malicious components. 3. Since this is a downloader, investigate for additional payloads, review persistence mechanisms (e.g., startup items, scheduled tasks), and change critical account passwords.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 17/11/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊