Malicious Office (OLE) / .XLA — malware analysis report

Static analysis result for SHA-256 fb38d357c169ebd0…

MALICIOUS

Office (OLE) / .XLA

298.5 KB Created: 2008-12-04 19:10:16 Authoring application: Microsoft Excel
MD5: d65284a23455336eddf0a44610b08d08 SHA-1: be6c333a45ce440781ad8604b010ef0069d86ee2 SHA-256: fb38d357c169ebd0c13bf2684134d7a82f51c555bfaceb140b611e8165932090
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1140 Deobfuscate or Decode Files or Information

The file is an Excel macro-enabled workbook (XLA) that contains a Workbook_Open macro. This macro is designed to execute automatically when the workbook is opened, and it uses a CreateObject call, indicating it's likely attempting to perform actions beyond typical Excel functionality. The presence of a lure to enable macros further supports its malicious intent. The script's auto-execution and use of Shell indicate it's designed to download and execute a second-stage payload.

Heuristics 8

  • 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 high 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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.datasafexl.com/WebHelp/Knowledgebase/KB1019_-_XLSafe_File_Extensions.htm
    • http://www.datasafexl.com/WebHelp/Knowledgebase/xlsafe_pro_troubleshooting.htm�
    • http://www.datasafexl.com/WebHelp/Installation/Activating_the_Software.htm�
    • http://www.datasafexl.com/support
    • http://www.datasafexl.com/WebHelp/Basic_Functions/Protecting_Existing_Spreadsheets_with_XLSafe_PRO.htm�
    • http://www.datasafexl.com/WebHelp/Knowledgebase/Protecting_Existing_Spreadsheets_Troubleshooting_Guide.htm�
    • http://www.datasafexl.com/WebHelp/XLSafe_Documentation.htm�
    • http://www.datasafexl.com/WebHelp/Knowledgebase/KB1017_-_Trust_access_to_VBA_project.htm�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
97f5df14fd35eb55b7f91a2990c1bb324ec0cad345806d877c2211ddf303acdc		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 50292 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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