Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2a51386ff86bfd99…

MALICIOUS

Office (OLE)

294.0 KB Created: 2020-07-15 07:56:55 Authoring application: Microsoft Excel
MD5: 10208cdfa622f83dc0ac664e14b30064 SHA-1: 69a2def3b54a0a775503d36e9bc49be3d4972816 SHA-256: 2a51386ff86bfd990ee75d7b3cb84b4d1df19c85a1e23a7fc5e51e592e07561f
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 malicious code executes automatically upon opening the document. The document body is heavily obfuscated and truncated, preventing further analysis of its specific intent or payload delivery. However, the core mechanism is the execution of XLM 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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