Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bf17b39b8521bc9a…

MALICIOUS

Office (OLE)

297.5 KB Created: 2020-07-15 07:56:55 Authoring application: Microsoft Excel
MD5: b6bb6b892b2bb48d49f91729520627e9 SHA-1: 2fa2da723a985dd9c825d043092da007c5cedde8 SHA-256: bf17b39b8521bc9a6d5d6b1acfccd26011ca3a297f2b67b40252b0b8a67a9cfa
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 and OLE_XLM_AUTOOPEN heuristic firings. The presence of encrypted macros strongly suggests malicious intent, likely for executing arbitrary code upon opening. However, the document body is heavily obfuscated and unreadable, and no scripts were extracted, limiting further analysis of the specific payload or 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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