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

Static analysis result for SHA-256 9f02013549837f8d…

MALICIOUS

Office (OLE) / .XLS

273.5 KB Created: 2020-09-14 21:28:14 Authoring application: Microsoft Excel
MD5: d79217b224e119ca574d21e542e05b89 SHA-1: b65b4418f1df571164a1385ab66fa9862bff35ec SHA-256: 9f02013549837f8dabe75cf353fe7eae347518905acd985584771eb307d3f1c3
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 that the malicious code executes automatically upon opening the file. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific intent. However, the combination of encryption and auto-execution macros strongly points to a malicious downloader or initial access mechanism.

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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