Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b0def7738227cc7d…

MALICIOUS

Office (OLE)

295.5 KB Created: 2020-07-15 07:56:55 Authoring application: Microsoft Excel
MD5: 78a3ec07db053e40f2b98eca107f30a3 SHA-1: 0a56a0cf7ce51cdddbfd599cc3278d070f98495b SHA-256: b0def7738227cc7d0031fa98d017d5549037510cb45ca2e5f6544eabd3e827ef
60 Risk Score

Malware Insights

MITRE ATT&CK
T1564.004 Obfuscated Files or Information: Masquerading T1059.005 Command and Scripting Interpreter: 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 suggests that the macro sheet is designed to execute automatically upon opening. The encrypted nature and the use of older Excel macro technology point towards a downloader or initial access mechanism. No specific IOCs were extracted, and the document body was unreadable.

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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