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

Static analysis result for SHA-256 72e4eb98d0bff0e9…

MALICIOUS

Office (OLE) / .XLS

42.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 8ad36671486f69dfdc4964a5ceaeb9d6 SHA-1: 08bca761f604886b8215f418dd42e879e7a2adf4 SHA-256: 72e4eb98d0bff0e9f4788d5044c3339b2d109fd1c417b3f00df0a79ae413b427
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a known technique for executing arbitrary code. The macro sheet contains references to dangerous formula APIs, specifically 'RUN', suggesting it is designed to execute a payload. The document body contains obfuscated text, further supporting a malicious intent.

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
40828a083172f49449d3de46c62e75844822f85e0de69c5781ebfe3ce2f7865d		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 9184 bytes

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