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

Static analysis result for SHA-256 896d80488e2a3f96…

MALICIOUS

Office (OLE) / .XLS

198.0 KB Created: 2021-02-23 19:30:17 Authoring application: Microsoft Excel
MD5: 1f80e8a6d967da99e042e1e82f83d032 SHA-1: 3ad126587df406c6ad72786d240e1e9e10dd5823 SHA-256: 896d80488e2a3f967752a3e8dc99c86cae225a7f6c6e1de4c8f63a281c8308f1
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an AUTOOPEN macro (OLE_XLM_AUTOOPEN) suggests it's designed to execute automatically upon opening. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure or payload. Without further script content or readable document text, the exact attack pattern and family remain uncertain.

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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