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

Static analysis result for SHA-256 baabbcd8df9bf8b8…

MALICIOUS

Office (OLE) / .XLS

182.0 KB Created: 2021-02-23 19:30:51 Authoring application: Microsoft Excel
MD5: ec94275750f5b42f72d977266a6597c7 SHA-1: 29f04371684425722f478d572e36ed52024bbfaf SHA-256: baabbcd8df9bf8b89730806166b56e0c3ba4bdcc38632a8d03f7452b1bb57b3d
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an auto-open macro (OLE_XLM_AUTOOPEN) suggests an intent to execute code automatically when the file is opened. The document body is heavily obfuscated and does not provide clear textual lures. Due to the lack of clear indicators in the document body and the encrypted nature of the macros, the specific payload and delivery mechanism remain unclear.

Heuristics 2

  • Encrypted Excel 4.0 macro sheet high OLE_XLM_ENCRYPTED_MACROSHEET
    Workbook contains an Excel 4.0 macro sheet and BIFF FILEPASS encryption. Password-protected XLM macro sheets, especially the default Excel password path, are a common malware evasion pattern because static formula extraction may fail until the workbook is decrypted.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

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