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

Static analysis result for SHA-256 9c1f20b9193d1a02…

MALICIOUS

Office (OLE) / .XLS

53.0 KB Created: 2020-04-28 14:00:40 Authoring application: Microsoft Excel
MD5: 5bb4e9d2ee9a7f4b04b1201ddb08b61e SHA-1: 4555b09edfb228e6e596025b17874a33ffae292b SHA-256: 9c1f20b9193d1a026c28d3dc8aebc32a1cf08b83fc7834f7bedc80d7c29819b2
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 auto-open macro (OLE_XLM_AUTOOPEN) suggests an intent to execute code upon opening. While no specific payload or URL was extracted, the encryption and macro usage are strong indicators of malicious intent, likely for delivering a secondary stage.

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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