Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b77730aa10dcda71…

MALICIOUS

Office (OLE)

67.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2020-09-15
MD5: e0fcbea8786e90c41f979968435b0b03 SHA-1: 5da29a96985f2f61e39ea50fafc663137717124c SHA-256: b77730aa10dcda715881244da45b4447be4b860d17d3b690b3cc8997c5b86325
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 code, suggesting the file's purpose is to deliver a malicious payload. The presence of an encrypted macro sheet and the 'AUTOOPEN' heuristic strongly indicate malicious intent.

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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