Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 133daa075ed34bd2…

MALICIOUS

Office (OOXML)

33.5 KB Created: 2015-10-22 09:04:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2021-05-29
MD5: 32bdd33a6bfcfbe5ba69096af572eb05 SHA-1: 3e51ab6b5073b963b230c125fe3b65dd0ec39a76 SHA-256: 133daa075ed34bd2088f8b5c165c23a6a33ed2d626a65ff68349ea3188c1750a
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is an OOXML document containing a VBA macro with a Document_Open auto-execution subroutine. This macro attempts to evade detection by checking various system properties and potentially executes further malicious actions via WMI's Win32_Process Create method. The document body and macro code indicate a purpose related to testing sandbox evasion techniques.

Heuristics 7

  • VBA project inside OOXML medium 5 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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.
  • 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.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/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)
    • https://www.maxmind.com/geoip/v2.1/city/meIn document text (OOXML body / shared strings)
    • https://www.maxmind.com/en/locate-my-ip-addressIn document text (OOXML body / shared strings)
    • https://www.maxmind.com/geoip/v2.1/city/me�In 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) 7884 bytes
SHA-256: ff32278b8f6f392f06a3b165e72f60888baa71152485eb6ad2f2f7d610c6b79f
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_Open()

   On Error Resume Next

   ActiveDocument.Range.Text = "Pafish for Office Macro v2, by Joe Security" & vbCrLf & vbCrLf & "Includes latest in-the-wild evasion checks. Developed to test and improve sandboxes!" & vbCrLf
   
    If checkISP() Then
     Debug.Print "ISP - detect"
    Else
     Debug.Print "ISP - norm"
    End If
    If checkMac() Then
     Debug.Print "Mac - detect"
    Else
     Debug.Print "Mac - norm"
    End If
    If checkFilenameBad() Then
     Debug.Print "Name - detect"
    Else
     Debug.Print "Name - norm"
    End If
    If checkProc() Then
     Debug.Print "Proc - detect"
    Else
     Debug.Print "Proc - norm"
    End If
    If checkTasks() Then
     Debug.Print "Tasks - detect"
    Else
     Debug.Print "Tasks - norm"
    End If
    If checkCores() Then
     Debug.Print "Cores - detect"
    Else
     Debug.Print "Cores - norm"
    End If
    If checkBios() Then
     Debug.Print "Bios - detect"
    Else
     Debug.Print "Bios - norm"
    End If
    If checkPnP() Then
     Debug.Print "PnP - detect"
    Else
     Debug.Print "PnP - norm"
    End If
    If checkRecentDocs() Then
     Debug.Print "Recent - detect"
    Else
     Debug.Print "Recent - norm"
    End If
     
     
   
End Sub


Function checkISP() As Boolean



    badISP = False
    badISPNames = Array("Amazon", "Anonymous", "Blue Coat Systems", "Cisco Systems", "Cloud", "Data Center", "Dedicated", "ESET", "FireEye", "Forcepoint", "Hetzner", "Hosted", "Hosting", "LeaseWeb", "Microsoft", "NForce", "OVH SAS", "Security", "Server", "Strong Technologies", "Trend Micro", "blackoakcomputers", "Datacamp")
    
    Set request = CreateObject("WinHttp.WinHttpRequest.5.1")


    request.Open "GET", "https://www.maxmind.com/geoip/v2.1/city/me", False
    request.setRequestHeader "Referer", "https://www.maxmind.com/en/locate-my-ip-address"
    request.setRequestHeader "User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0)"
    request.setRequestHeader "Host", "www.maxmind.com"
    request.send

        
        For Each badName In badISPNames
             If InStr(request.responseText, badName) > 0 Then
                badISP = True
            End If
        Next


    

    checkISP = badISP
    
End Function

Function checkProc() As Boolean

    Dim Name As String
    Dim Desc As String

    badProc = False
    badMacNames = Array("vbox", "vmware", "vxstream", "autoit", "vmtools", "tcpview", "wireshark", "process explorer", "visual basic", "fiddler", "qemu", "virtual", "kvm", "xen", "redhat")
    
    Set objWMIService = GetObject("winmgmts:\\.\root\cimv2")
    Set colAdapters = objWMIService.ExecQuery("SELECT * FROM Win32_Process")
    For Each objAdapter In colAdapters
        
        Name = objAdapter.Name

        For Each badName In badMacNames
            If InStr(LCase(Name), badName) > 0 Then
                badProc = True
            End If
        Next
    Next

    

    checkProc = badProc
    
End Function

Function checkMac() As Boolean



    badMac = False
    badMacNames = Array("00:50:56", "00:0C:29", "00:05:69", "80:00:27", "00:1C:42", "00:16:3E")
    
    Set objWMIService = GetObject("winmgmts:\\.\root\cimv2")
    Set colAdapters = objWMIService.ExecQuery("Select * from Win32_NetworkAdapter")
    For Each objAdapter In colAdapters
        
        MACAddress = objAdapter.MACAddress
        For Each badName In badMacNames
            If InStr(MACAddress, badName) > 0 Then
                badMac = True
            End If
        Next
    Next

    

    checkMac = badMac
    
End Function









Function checkFilenameBad() As Boolean

    
  
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 48640 bytes
SHA-256: 25d5090e578d63775f40960ea79a8d4390438af29e0ca2d5d10aa2b80d450bc7

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