Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 cc0370aee0ab614f…

MALICIOUS

Office (OLE)

585.0 KB Created: 2020-05-04 16:32:23 Authoring application: Microsoft Excel First seen: 2020-08-25
MD5: 6fd7426e9a9068eb9c3a809a6f5e3f47 SHA-1: 6db56743b77172275cf0e8dfd8278f22d0e972bb SHA-256: cc0370aee0ab614fc0a129652c1a088c78e92e9327eeaa57fded1de7bd5a15c0
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet, identified as encrypted and containing an auto-open macro. This indicates the file is designed to execute arbitrary code upon opening. The presence of encrypted macros and the auto-open functionality strongly suggest a malicious intent, likely for downloading and executing a secondary payload.

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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