Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3ab51eccc30c4b56…

MALICIOUS

Office (OLE)

327.5 KB Created: 2020-07-21 07:21:33 Authoring application: Microsoft Excel First seen: 2020-09-15
MD5: 33c9545d179c023c78a33d002eb69973 SHA-1: 4632c911fc5134168fa8ccc24e8c7051ee82b329 SHA-256: 3ab51eccc30c4b56d3841fd4d2e864559824079adc63fe4db11e2c08b57c6fc6
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 suggests an attempt to hide malicious macro code, which is commonly used to download and execute further stages of malware. The presence of an encrypted macro sheet and the 'AUTOOPEN' heuristic indicate a high likelihood of malicious intent.

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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