Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b90b74c3dd9fddde…

MALICIOUS

Office (OLE)

57.0 KB Created: 2020-05-05 22:20:39 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 6306070ed0ecf1cbfd11a8b42e29f882 SHA-1: b5dab3b7101c3eee8cdf8efa1f3bf50e0891ffc1 SHA-256: b90b74c3dd9fddde1ff876b94cfdd5070fe18652d3b88d89cb92cc802aff65fe
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 is often used to download and execute secondary payloads or perform other malicious actions. The presence of encryption suggests an attempt to evade static analysis.

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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