Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d1435c4ea3365b5f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:05 Authoring application: Microsoft Excel
MD5: 650c2c182df6e0559f35ff4f9abcde5b SHA-1: 09445d3187cb882565606398c62e99cdee92ebc0 SHA-256: d1435c4ea3365b5f78895c75fb6fc2481febfbd5329568b31ea14a98c0c67b2d
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a known technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates the macro is designed to execute arbitrary commands or download further payloads. No specific family could be identified, but the technique is common for initial execution.

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
5db4821fc2f876b682bdbb92b926593279cf632c6c6ef941687d3e2fa6a7777e		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6342 bytes

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