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

Static analysis result for SHA-256 ed9fbfff8a3f7cb8…

MALICIOUS

Office (OLE) / .XLS

191.0 KB Created: 2020-10-20 04:51:55 Authoring application: Microsoft Excel
MD5: 4db350e4b79b3e6bd63ddb7e0122a2c1 SHA-1: 9d57b78ee8044f2a0c2c50fbbf49e84c4e8ca5e3 SHA-256: ed9fbfff8a3f7cb8733b6fbce875e7d6313d5b4242a0292b476d86285696c10f
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of encrypted Excel 4.0 macros (OLE_XLM_ENCRYPTED_MACROSHEET) strongly suggests malicious intent. The auto-open macro (OLE_XLM_AUTOOPEN) further supports this, as it is designed to execute automatically when the spreadsheet is opened. The document body is heavily obfuscated and unreadable, providing no further clues about the specific lure or payload.

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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