Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6c1f636868cad047…

MALICIOUS

Office (OLE)

292.0 KB Created: 2020-07-15 07:56:55 Authoring application: Microsoft Excel
MD5: 93e3c45c3ad6f8f020685af09832317a SHA-1: 4621f8d20f921a4eb34633bf5ae29649ce574c2e SHA-256: 6c1f636868cad0479a73010475962a22335a8981b935ab9e8871385bf868fcee
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file identified as containing an encrypted Excel 4.0 macro sheet. This type of macro is often used to download and execute malicious payloads. The presence of encrypted macros and the 'AUTOOPEN' heuristic strongly suggest malicious intent, likely for initial execution of a secondary stage.

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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