Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 472b05b5ea2565b1…

MALICIOUS

Office (OLE)

57.0 KB Created: 2020-05-05 22:20:39 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 740933ec7453ee0834825037bb4e145f SHA-1: 7dea37c825caba7c251f67622f79a9fe57025635 SHA-256: 472b05b5ea2565b170a333fb876d2d02340584f3bae3821a2940f8b1894ce931
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 secondary payloads or perform other malicious actions. The presence of encryption suggests an attempt to evade static analysis.

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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