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

Static analysis result for SHA-256 ad010728cb9d54a0…

MALICIOUS

Office (OLE) / .XLS

178.0 KB Created: 2021-02-23 19:19:01 Authoring application: Microsoft Excel
MD5: 8e7476cee5fea2c2e06904d2b0123cc5 SHA-1: 804b4da752285ea5d8dbe94068f00ab9ac61b45a SHA-256: ad010728cb9d54a06861eaa41d12a5e526f31c8ea1a448af5c1d4d76adc60f98
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 OLE_XLM_AUTOOPEN heuristic further confirms the use of auto-executable macros. The document body is heavily obfuscated and truncated, preventing a detailed analysis of its specific intent. However, the combination of encryption and auto-execution strongly suggests a malicious downloader or payload delivery mechanism.

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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