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

Static analysis result for SHA-256 7bc46b901b3d4ceb…

MALICIOUS

Office (OLE) / .XLS

217.5 KB Created: 2020-10-01 02:52:16 Authoring application: Microsoft Excel
MD5: 2a11a7fad1cd71db8dd60a0cd6d2a0b0 SHA-1: 18d2b3acf24f5392df225cf98a0ab4fb85ff457c SHA-256: 7bc46b901b3d4cebe693ddc897a533b132800e2db37e77f2a9800fb4da1718bd
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 auto-open macro (OLE_XLM_AUTOOPEN) suggests an intent to execute code automatically when the file is opened. Without further deobfuscation or script content, the exact payload and family remain unknown.

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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