Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 128503f4b0e1174d…

MALICIOUS

Office (OLE)

720.5 KB Created: 2020-05-26 18:46:28 Authoring application: Microsoft Excel First seen: 2020-08-25
MD5: 4e01760bab19474560ebc97b9fa1c651 SHA-1: 379f02d85cf7ec50decc934d61cb8140789ddfe6 SHA-256: 128503f4b0e1174d03d89fcac4cf6991dda494f10d748157daa90ed0a032fd4e
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET and OLE_XLM_AUTOOPEN heuristic firings. This suggests the document is designed to execute malicious macros upon opening, a common technique for initial access via spearphishing attachments. No specific URLs or further payloads were extracted from this sample.

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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