Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 54030a5aa2408ec4…

MALICIOUS

Office (OLE)

348.0 KB Created: 2020-07-21 07:21:33 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: dc67ff40bc0b0f6f9441715d1d8aa6e7 SHA-1: 494fd57b7634e10680c7ab8e4d345c8b0cac29be SHA-256: 54030a5aa2408ec418cc12c3a583f98edacf0a0bc63f78745bb9ef62a4781562
60 Risk Score

Malware Insights

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

The file is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET and OLE_XLM_AUTOOPEN heuristics. This suggests the file was likely delivered as a spearphishing attachment, aiming to trick the user into enabling macros to execute the embedded malicious Excel 4.0 (XLM) code. The specific actions of the macro are obscured by encryption, preventing further analysis of its payload.

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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