Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3da75fa931d41935…

MALICIOUS

Office (OLE)

1.24 MB Created: 2004-05-21 07:18:45 Authoring application: Microsoft Excel First seen: 2020-01-07
MD5: afa4ccf1f6607404ccd76d9949c80f68 SHA-1: ba904cdefff7b275be5eff67ce5a28e0e5ec83ed SHA-256: 3da75fa931d419355b66123667f6ede3941a9b099ef8b589e111580d544f7ecb
144 Risk Score

Malware Insights

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

The file is an Excel document containing a Workbook_Open VBA macro, which is a common technique for executing malicious code upon opening. The macro utilizes CreateObject and p-code auto-execution, indicating it's designed to run arbitrary commands. While the specific payload is not directly visible, the presence of obfuscated VBA code and the Workbook_Open event strongly suggests it acts as a downloader for a second-stage payload. The document body contains what appears to be data related to Russian regional organizations and services, possibly as a lure.

Heuristics 6

  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open 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.
  • 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://eias.ru/?page=show_distrs In document text (OLE body)
    • https://tariff.eias.ru/procwsxls/In document text (OLE body)
    • http://www.fstrf.ru/regions/region/sRIn document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn document text (OLE body)
    • http://sakha.gov.ru/node/6471In 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) 855332 bytes
SHA-256: bff8c732a1b22222b151714979cfd3ca875dd7a220635373ea24e4ba1006b567
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ЭтаКнига"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Option Explicit

Dim SErr As Boolean

Private Const SAVE_STATUS_CRITICAL_IMPACT_WARNING As String = "Шаблон будет сохранен, но НЕ БУДЕТ принят к рассмотрению из-за невыполнения ОБЯЗАТЕЛЬНЫХ условий! См. лист 'Проверка'!"
Private Const SAVE_STATUS_SUCCESS As String = "Шаблон готов к сохранению без замечаний"
Private Const SAVE_STATUS_LOW_IMPACT_WARNING As String = "Шаблон будет принят к рассмотрению, но обратите внимание НЕВЫПОЛНЕНИЕ ПРЕДУПРЕДИТЕЛЬНЫХ условий на листе 'Проверка'"
Private Const SAVE_MESSAGE_TITLE As String = "Результат проверки"

Private Sub Workbook_BeforeSave(ByVal SaveAsUI As Boolean, Cancel As Boolean)

    Application.Calculate
    
    Dim wsSheet As Worksheet
    
    Set wb = Application.ThisWorkbook
    Set wsSheet = wb.ActiveSheet
    
    If Len(CStr(Me.Names("region_name").RefersToRange.Value)) > 0 Then
        modPROV.WarningsBeforeSaving Me
              
        If modPROV.gintCriticalImpactWarningsCounter > 0 Then
          Me.CustomDocumentProperties("Status") = 1 'ТРАНС
          MsgBox SAVE_STATUS_CRITICAL_IMPACT_WARNING, vbCritical + vbOKOnly, SAVE_MESSAGE_TITLE
          Me.Worksheets("Проверка").Activate
        ElseIf modPROV.gintLowImpactWarningsCounter > 0 Then
          Me.CustomDocumentProperties("Status") = 1 'ТРАНС
          MsgBox SAVE_STATUS_LOW_IMPACT_WARNING, vbExclamation + vbOKOnly, SAVE_MESSAGE_TITLE
          Me.Worksheets("Проверка").Activate
        Else 'ТРАНС
          Me.CustomDocumentProperties("Status") = 2 'ТРАНС
          MsgBox SAVE_STATUS_SUCCESS, vbInformation, SAVE_MESSAGE_TITLE
          wsSheet.Activate
        End If
        
    End If
    
    On Error GoTo ErrHandler
    
    Dim status As Integer
    status = wb.CustomDocumentProperties("Status")
    If status > 2 Then
      MsgBox "Документ подписан ЭЦП и не может быть изменен", vbExclamation + vbOKOnly, ThisWorkbook.name
      Cancel = True
      GoTo cleanUp
    End If

    GoTo cleanUp
    
ErrHandler:
    MsgBox "При сохранении шаблона произошла ошибка: '" & Err.Description & "'!", _
           vbOKOnly + vbCritical, _
           STR_MSGBOX_WARNING_TITLE
    GoTo cleanUp
    
cleanUp:


End Sub

Private Sub Workbook_Open()
  
  On Error GoTo ErrHandler
  
  Application.Calculation = xlCalculationAutomatic ' чтобы пересчет формул осуществлялся автоматически
  Application.ReferenceStyle = xlA1 ' стиль ссылок - A1
  ThisWorkbook.CustomDocumentProperties("Status") = 1 'ТРАНС
  
  Dim wsSheet As Worksheet
  Dim wsActiveSheet As Worksheet
  Dim wsTitleSheet As Worksheet
  Dim wbBook As Workbook
  
  Set wbBook = Application.ThisWorkbook
  Set wsActiveSheet = wbBook.ActiveSheet
  
    ' Проверить необходимые для работы диапазоны
    If modServiceModule.IsNameExists(wbBook, "region_name") = False Or _
       modServiceModule.IsNameExists(wbBook, "strPublication") = False Or _
       modServiceModule.IsNameExists(wbBook, "flag_two_part_tariff") = False Or _
       modServiceModule.IsNameExists(wbBook, "flag_cross_subsidization") = False Then
      
         MsgBox "Повреждены рабочие диапазоны на листе '" & gstrMainSheetName & "': '" & Err.Description & "'!", _
                vbOKOnly + vbCritical, _
                STR_MSGBOX_WARNING_TITLE
      GoTo cleanUp
    End If
  
  If Len(CStr(wbBook.Names("region_name").RefersToRange.cells(1, 1).Value)) = 0 Then

    For Each wsSheet In wbBook.Worksheets
      If wsSheet.Visible = True Then
        If wsSheet.Tab.ColorIndex = colorPaleBlue Then
          wsSheet.Visible = xlSheetVeryHidden
        End If
      End If
    Next wsSheet
    
  Else
    Set wsTitleSheet = wbBook.Names("region_name").RefersToRange.parent
    wsTitleSheet.Activate
    wsTitleSheet.Range(
... (truncated)

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