Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 c78b02f2ebe6bab9…

MALICIOUS

Office (OLE) / .XLS

188.0 KB Created: 2020-11-10 04:28:20 Authoring application: Microsoft Excel
MD5: e9326d090e47b8acc82ab6a1b9d2fd4f SHA-1: 6a3f17ceb221731f45e4367031a56663ada6730c SHA-256: c78b02f2ebe6bab940e72b8131e329941c757c5c8f560deeabb0b84d83d64754
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The OLE_XLM_AUTOOPEN heuristic further confirms the presence of an XLM macro sheet. The document body is heavily obfuscated and unreadable, suggesting it contains a hidden malicious payload. No specific IOCs were extracted due to the obfuscation.

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.