Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 37e3e94e6474bc1f…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:44:19 Authoring application: Microsoft Excel
MD5: 4703614ffff5d2e26e47f11aa3af44b9 SHA-1: 571a80a8dc6d5141e4d69b421a742356442e83d2 SHA-256: 37e3e94e6474bc1f18bf268282ddbd348bd478522d8ddd51244c58639ede7a05
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open function. This function is designed to execute arbitrary code upon opening the workbook, indicating a malicious intent to compromise the user's system. The specific dangerous formula APIs used, such as RUN, suggest the macro is intended to download and execute a secondary 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
dd1222d786cf0ea91f93e3c2aef968f27eae8c1d0f18bf0924ef35d56e8bce50		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6787 bytes

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