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

Static analysis result for SHA-256 fe3ced9122f12930…

MALICIOUS

Office (OLE) / .XLS

228.0 KB Created: 2020-10-01 02:51:10 Authoring application: Microsoft Excel
MD5: 751767feba577af24a579b15d65915d1 SHA-1: c26e79082d9c5570e5ea1b4d5b514880b752ea80 SHA-256: fe3ced9122f129303f8fe24edd075d84b4e155b388958f4f4e6240320618af2c
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an OLE_XLM_AUTOOPEN heuristic further suggests that macros are intended to run automatically. The document body is unreadable, but the heuristics strongly indicate a malicious macro execution attempt.

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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