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

Static analysis result for SHA-256 59afe59cdbebf604…

MALICIOUS

Office (OLE) / .XLS

228.5 KB Created: 2020-08-26 03:47:30 Authoring application: Microsoft Excel
MD5: 56fc044937a072471fdd8d63b874e04a SHA-1: 738552f8db33ac0271aa860775815f3d1b291980 SHA-256: 59afe59cdbebf60434bd78270826ca9689c3765264dfcace312b89c606c0a962
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, which is a strong indicator of malicious intent. The presence of an 'AUTOOPEN' macro further suggests automatic execution of code when the spreadsheet is opened. Without further deobfuscation or script content, the exact payload and delivery mechanism remain unclear.

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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