Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b80bf3e8af73d4ca…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:06 Authoring application: Microsoft Excel
MD5: d5f0d1c922fe563a2a00c4adcc73e9fb SHA-1: c06bbab0fb075a2b42a65a0a1906040cca1b039e SHA-256: b80bf3e8af73d4ca51e79724c66aa6f27b449d1d11a69525deda155aaaeb1720
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known method for executing malicious code. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands. The macro sheet itself contains obfuscated data, suggesting an attempt to hide the malicious payload.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
25982108a512ccee9a36840994d33726cb70a74c96fae8bbd44610df50b4eed9		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6591 bytes

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