Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 4ff55c827b4adacd…

MALICIOUS

Office (OLE) / .XLS

233.0 KB Created: 2020-09-20 23:07:45 Authoring application: Microsoft Excel
MD5: ed1d71a370f93a3e9e6e1c64d5cac383 SHA-1: c9cd8102a06570777190b1919f57edb93451c26d SHA-256: 4ff55c827b4adacd0f503e307ce3e2fe61423aa32dafe999d2e6409188613897
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, which is a common technique for obfuscating malicious content. The presence of an 'AUTOOPEN' macro further suggests that the sheet is designed to execute automatically upon opening. While no specific URLs or scripts were extracted, the encryption and macro sheet structure strongly imply a malicious intent, likely to download and execute 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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