Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7b71ca07eda8229b…

MALICIOUS

Office (OLE)

349.0 KB Created: 2020-07-21 07:21:33 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: 601bdae467e710d89b848affe136a3c8 SHA-1: 58977c381b596ce45e0f47bee11e5f9aa3c0859e SHA-256: 7b71ca07eda8229b0546c37b12125bd2802e531fa086035516d16ebfc18eaa4b
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an AUTOOPEN macro suggests it's designed to execute automatically upon opening. While the document body is heavily obfuscated and unreadable, the macro sheet structure points to a malicious intent, likely to download and execute a secondary payload or perform other malicious actions.

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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