Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 457f1d80ba707fcd…

MALICIOUS

Office (OLE)

597.5 KB Created: 2020-05-04 21:59:42 Authoring application: Microsoft Excel First seen: 2020-09-15
MD5: 353798fd44bcff0d96552251d3589309 SHA-1: ba06e34b4c56a767bca578b57c5cb1b93d5db581 SHA-256: 457f1d80ba707fcd4e9592aecf1aa49a431c30f0f65e68c524beddd9e9115880
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file identified as containing an encrypted Excel 4.0 macro sheet. This type of macro sheet is often used to execute arbitrary commands or download further malicious payloads. The presence of encrypted macros suggests an attempt to obfuscate malicious activity.

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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