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

Static analysis result for SHA-256 117b20f0f6709175…

MALICIOUS

Office (OLE) / .XLS

41.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 55ea7ea3057c72d0a0b586ce4ad353d2 SHA-1: c95ec99905500213c7db25551cd1bfb2ab7b6a14 SHA-256: 117b20f0f670917503aa736493c62d4b22d6466787d72c6282c5736e27a4b976
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 (XLM) macros. Heuristics indicate the presence of an Auto_Open macro and the use of dangerous formula APIs, specifically 'RUN'. This suggests the macro is intended to execute arbitrary code, likely downloading and running a second-stage payload. No specific family could be identified.

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
ea7a9aa1097d368412c17876d97760b9bf4e53afad6ae54778f8cd3f97641f28		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 7843 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.