Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1b29b2f02f2adc08…

MALICIOUS

Office (OLE)

345.5 KB Created: 2020-07-13 11:03:58 Authoring application: Microsoft Excel First seen: 2020-09-15
MD5: d0910fd1e35ad1ef62fb17779544f6bb SHA-1: 897e4994800a8344fc06242495857aa042a2ba00 SHA-256: 1b29b2f02f2adc08412b1d0981cd7a7b4bea7e6a08d047dd2fc5f711b2756e03
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. This suggests the file is designed to run malicious macros. The OLE_XLM_AUTOOPEN heuristic further confirms the presence of an auto-executable macro. Without further deobfuscation or script content, the exact payload and family remain unknown.

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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