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

Static analysis result for SHA-256 23def268b2e13c17…

MALICIOUS

Office (OLE) / .XLS

243.5 KB Created: 2020-11-11 04:30:54 Authoring application: Microsoft Excel
MD5: ca8d6f10a2cdb0363c4ccef72df04973 SHA-1: 6aa298df89b099967dd0b060ca83f7cabff68e53 SHA-256: 23def268b2e13c179cdbfce42cc571a3e43622030165ff58f548f52556909460
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of an encrypted Excel 4.0 macro sheet, identified by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic, strongly suggests malicious intent. The OLE_XLM_AUTOOPEN heuristic further indicates that macros are present and likely intended to execute automatically. The document body is heavily obfuscated and unreadable, providing no further clues about the specific payload or lure. Without readable script content or URLs, the exact attack pattern and family remain undetermined.

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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