Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f964b2f71f845e61…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:34 Authoring application: Microsoft Excel
MD5: bb43a79b21e6e9e8f77bc9b4436890cf SHA-1: 7a5b488c384f656343f31241fbf9e0942717790f SHA-256: f964b2f71f845e61f2ef8adbb838b477ed04b7f1fd7786dc6c8a8f5292285829
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding. This indicates an attempt to automatically execute code upon opening the workbook. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands or download further payloads, aligning with common malicious macro behaviors.

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
cd84db6fe330848fda1eb3ac7043d081fd40db8d0c6416eaff8303e7d113b633		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6640 bytes

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