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

Static analysis result for SHA-256 265bcc9cc825e146…

MALICIOUS

Office (OLE) / .XLS

227.0 KB Created: 2020-09-24 19:34:44 Authoring application: Microsoft Excel
MD5: ab7bbcde4072931f6ae52b6056d8eae5 SHA-1: 61ebfff454ed3ea68a17846b67a45a244351bcf9 SHA-256: 265bcc9cc825e1466234d7de09dac0e5039fa27f6f3b39b0bde08ee5c6fe459b
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

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

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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