Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e44e2641571c54ca…

MALICIOUS

Office (OLE)

88.0 KB Created: 2019-12-17 00:11:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: eeccf5831caa8467c8537dfe8e8a84a2 SHA-1: f74f9831fabff59a2a9a93c092f45802471bafdf SHA-256: e44e2641571c54ca2ef4c820197a834528a191072e7890917ce962fe9d30cf61
224 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing VBA macros. The AutoOpen macro is present and uses CreateObject, indicating an attempt to execute code. The presence of a 'macros.bas' file and the ClamAV detection strongly suggest this is a macro-based malware delivery mechanism. The VBA code appears to be attempting to interact with ADODB.Recordset, which can be used to download and execute further stages.

Heuristics 8

  • ClamAV: Doc.Malware.Ejki-7475390-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Ejki-7475390-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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)
    • http://schemas.microsoft.com/office/2006/01/customuiIn 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) 103695 bytes
SHA-256: 57b1332b20e454cabcc064791d3eca2bd703c0488e0730234494a6dc9f15a364
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 19 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).
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 Const CP_UTF8                       As Long = 65001

#If Win64 Then
Private Declare PtrSafe Function WideCharToMultiByte Lib "kernel32" (ByVal CodePage As LongPtr, ByVal dwFlags As LongPtr, ByVal lpWideCharStr As LongPtr, ByVal cchWideChar As LongPtr, lpMultiByteStr As Any, ByVal cchMultiByte As LongPtr, ByVal lpDefaultChar As LongPtr, ByVal lpUsedDefaultChar As LongPtr) As LongPtr
Private Declare PtrSafe Function MultiByteToWideChar Lib "kernel32" (ByVal CodePage As LongPtr, ByVal dwFlags As LongPtr, lpMultiByteStr As Any, ByVal cchMultiByte As LongPtr, ByVal lpWideCharStr As LongPtr, ByVal cchWideChar As LongPtr) As Long
#Else
Private Declare Function WideCharToMultiByte Lib "kernel32" (ByVal CodePage As Long, ByVal dwFlags As Long, ByVal lpWideCharStr As Long, ByVal cchWideChar As Long, lpMultiByteStr As Any, ByVal cchMultiByte As Long, ByVal lpDefaultChar As Long, ByVal lpUsedDefaultChar As Long) As Long
Private Declare Function MultiByteToWideChar Lib "kernel32" (ByVal CodePage As Long, ByVal dwFlags As Long, lpMultiByteStr As Any, ByVal cchMultiByte As Long, ByVal lpWideCharStr As Long, ByVal cchWideChar As Long) As Long

#End If
 



 
 Dim Fenglo As Variant


Public Sub Carrega(ID As Long)

    ' Consulta SQL
    sSQL = "SELECT * FROM " & sTable & " WHERE id = " & ID
    
    ' Cria objeto Recordset
    Set rst = New ADODB.RecordSet
    
    ' Atribui resultado da consulta SQL ao recordset
    rst.Open sSQL, cnn, adOpenStatic
    
    '---Propriedades
    With rst
        Me.ID = .Fields("id").Value
        Me.Endereco = .Fields("endereco").Value
        Me.Bairro = .Fields("bairro").Value
        Me.Cidade = .Fields("cidade").Value
        Me.UF = .Fields("uf").Value
        Me.TipoID = .Fields("tipo_id").Value
        Me.ClienteID = IIf(IsNull(.Fields("cliente_id").Value), Null, .Fields("cliente_id").Value)
    End With
    
End Sub

' Rotina para incluir registro no banco de dados
Public Sub Inclui()

    Set rst = New ADODB.RecordSet

    'Armazena na variavel o comando que fara a consulta SQL no BD Access
    With rst
        .Open Source:=sTable, _
              ActiveConnection:=cnn, _
              CursorType:=adOpenDynamic, _
              LockType:=adLockOptimistic, _
              Options:=adCmdTable
        .AddNew
        
        Me.ID = .Fields("id").Value
        .Fields("endereco").Value = Me.Endereco
        .Fields("bairro").Value = Me.Bairro
        .Fields("cidade").Value = Me.Cidade
        .Fields("uf").Value = Me.UF
        .Fields("tipo_id").Value = Me.TipoID
        .Fields("cliente_id").Value = Me.ClienteID
        
        .Update
    End With
    
    Set rst = Nothing
       

End Sub

' Rotina para alterar registro no banco de dados
Public Sub Altera()
    
    Set rst = New ADODB.RecordSet
    
    ' Comando SQL
    sSQL = "SELECT * FROM " & sTable & " WHERE id = " & Me.ID

    'Armazena na variavel o comando que fara a consulta SQL no BD Access
    With rst
        .Open Source:=sSQL, _
              ActiveConnection:=cnn, _
              CursorType:=adOpenDynamic, _
              LockType:=adLockOptimistic
        
        ' Atribui novos valores aos campos
        .Fields("endereco").Value = Me.Endereco
        .Fields("bairro").Value = Me.Bairro
        .Fields("cidade").Value = Me.Cidade
        .Fields("uf").Value = Me.UF
        .Fields("tipo_id").Value = Me.TipoID
        .Fields("cliente_id").Value = Me.ClienteID
        
        ' Grava alteracoes
        .Update
    End With
    
    Set rst = Nothing
End Sub

' Rotina para Excluir registro do banco de dados
Public Sub Exclui()
    
    sSQL = "UPDATE " & sTable & " SET deletado = True WHERE id = " & Me.ID
    
    cnn.Execute s
... (truncated)

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