Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 82b09119bd956833…

MALICIOUS

Office (OLE)

155.0 KB Created: 2020-04-08 14:30:53 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 6957da82372c188375e9926e8b75d2bd SHA-1: d8b30dd7e673f555ac517a982954eeaa29c762de SHA-256: 82b09119bd95683385f7d1cac57a6c879e201e45b87dac44f3ed190240e83e88
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, indicated by multiple heuristic firings including OLE_XLM_ENCRYPTED_MACROSHEET and OLE_XLM_AUTOOPEN. The presence of encrypted macros strongly suggests an intent to execute arbitrary code, likely for malicious purposes such as downloading further payloads or establishing persistence. The document body was unreadable, preventing a more specific assessment of the lure.

Heuristics 3

  • OLE metadata lists many Excel 4.0 macro sheets high 2 related findings OLE_XLM_DOCPROPS_MACROSHEET_INVENTORY
    Workbook contains a BIFF Excel 4.0 macro-sheet marker and its clear OLE DocumentSummaryInformation stream lists many MacroN sheet titles. This is a useful static signal when FILEPASS encryption prevents formula extraction from the workbook stream.
  • 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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