Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c6f36b3f4b3d14fc…

MALICIOUS

Office (OLE)

721.0 KB Created: 2020-05-26 18:46:28 Authoring application: Microsoft Excel First seen: 2020-08-10
MD5: 6e3d8ac748586b80ed19b5d1ac13ac0b SHA-1: 565fd91228ac169b0c91534fea4867d71c9f66f5 SHA-256: c6f36b3f4b3d14fc24db8bd3b24b70757977f253fa26a7a76564aa365cba95a2
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file identified as malicious, containing an encrypted Excel 4.0 macro sheet. The presence of OLE_XLM_ENCRYPTED_MACROSHEET and OLE_XLM_AUTOOPEN heuristics strongly suggests that the macro sheet is designed to run automatically, likely to download and execute a secondary payload. No specific family could be identified due to the encryption and lack of further script details.

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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