Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 993d3c6a5784db2f…

MALICIOUS

Office (OLE)

520.0 KB Created: 2020-07-14 08:40:55 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: 4fbb236d98363885d109cd868c0cc81f SHA-1: cd18bf81926b371781d4da2bba83eb6bc0837950 SHA-256: 993d3c6a5784db2f533d9146bb951916190a03ea2103b2ef6a8de49f2cb61694
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, preventing detailed analysis of its contents. The presence of encrypted macros and the 'AUTOOPEN' heuristic strongly suggest malicious intent, likely to execute further stages or commands upon opening.

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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