Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3796bac8527014eb…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:13 Authoring application: Microsoft Excel
MD5: 67098cee8309d9d8b8f263cd4834a3ca SHA-1: 9f956c0a073605e186fa2509c92a78211e3560b9 SHA-256: 3796bac8527014ebeb8a4076aaace5d3e26acd8dcef2605a7bd8c9d7e60e0b82
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 document detected with critical heuristics for OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN. The presence of an Auto_Open defined name indicates that the macro will execute automatically when the workbook is opened, likely to perform malicious actions. The specific dangerous formula API used (RUN=0) suggests an attempt to execute arbitrary code.

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
7e73560e6c2123a1bb6528bb472edd6321843848a243f91b4d71e9cb2087d5c5		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6595 bytes

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