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

Static analysis result for SHA-256 ebf73a204a55e452…

MALICIOUS

Office (OLE) / .XLS

245.5 KB Created: 2020-09-14 21:28:14 Authoring application: Microsoft Excel
MD5: 25c97bdfd4dcc6c9a8cf713d057d1156 SHA-1: 1b9a4e98b5efdf7eac0988cd55bf40585727f81a SHA-256: ebf73a204a55e45288a9d715a9cc9481e0c420d69da76562ab70552c5ba956a4
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 is designed to execute automatically upon opening. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific intent. However, the combination of encryption and auto-execution points towards a malicious downloader or dropper.

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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