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

Static analysis result for SHA-256 c322894edc669ce3…

MALICIOUS

Office (OLE) / .XLS

239.0 KB Created: 2020-09-20 23:06:53 Authoring application: Microsoft Excel
MD5: af469964eb76570abce9041633180c0f SHA-1: de0cf55fd46d840c4e713d10c7ecd5fecd36f879 SHA-256: c322894edc669ce3f8e870a5eefc8a114dc007939df4053c330a748f0b0ee580
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, as indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an auto-open macro (OLE_XLM_AUTOOPEN) suggests that the sheet is designed to execute code upon opening. Due to the encryption and lack of readable document body or script content, the exact payload and delivery mechanism cannot be determined, leading to an unknown family classification.

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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