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

Static analysis result for SHA-256 c5f23491d13ca1a0…

MALICIOUS

Office (OLE) / .XLS

176.5 KB Created: 2020-10-13 20:46:39 Authoring application: Microsoft Excel
MD5: 857cfce5f415c330f16bde8bd48aa4ff SHA-1: 65e3d304797221f226e2df8184fe46d7f679c2cf SHA-256: c5f23491d13ca1a0a0f839d8492082b4812ef8dd6d20a57bb14943f50f8f64f7
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 OLE_XLM_AUTOOPEN heuristic further confirms the presence of an auto-executing macro. Due to the encryption and lack of readable document body or script content, the exact payload delivery mechanism cannot be determined, but the presence of these heuristics strongly suggests malicious intent.

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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