Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6bd213b614f70681…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:22 Authoring application: Microsoft Excel
MD5: 1245276982fa9a2eefcb1262d288d628 SHA-1: dffa1b2aa2c68383cb89840d54c6a90fbbfca6c6 SHA-256: 6bd213b614f70681cce6ba4d32d1dc157b154053c61dffc82b3c1c73d62c8ca9
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 macro, which is a critical finding. This indicates the sample is designed to automatically execute code upon opening. The presence of dangerous formula APIs like RUN suggests the macro is intended to download and execute a secondary payload, a common technique for malware delivery.

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
ed222b593630bb079136d32690623b4fc05207076420afe5a3d8020468ac5510		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6658 bytes

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