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

Static analysis result for SHA-256 461ce5ff8db1ab73…

MALICIOUS

Office (OLE) / .XLS

183.0 KB Created: 2021-02-23 19:31:34 Authoring application: Microsoft Excel
MD5: 739374835bf3097e57dc3c3626f65b41 SHA-1: 9502e6f155dfcbc3e848567b366327d95b7f7ed2 SHA-256: 461ce5ff8db1ab7352a094b59c839c413425ce261f9e868d5de3fcf5b6f00ca1
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an AUTOOPEN macro (OLE_XLM_AUTOOPEN) suggests that the macro code executes automatically upon opening the file. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure or payload. However, the core functionality relies on the execution of these older Excel macros.

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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