Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1b7a05712f28b561…

MALICIOUS

Office (OLE)

83.0 KB Created: 2021-02-14 21:20:39 Authoring application: Microsoft Excel
MD5: 0bc1bc833fa700dc539ebfbec34217df SHA-1: 7e9d8b9edf39db73756378070e073478d450c00e SHA-256: 1b7a05712f28b561e72a5e966690ecf41be1655f46cc250ab485d6fcd568b107
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 auto-open macro (OLE_XLM_AUTOOPEN) suggests it's designed to execute automatically upon opening. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure or payload delivery mechanism. However, the core functionality relies on the execution of Excel 4.0 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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