Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d3d1b80565bb29f6…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:33 Authoring application: Microsoft Excel
MD5: 8e2594b1f3605248166e9838dd2ad180 SHA-1: 96533627b112d856a2892a7285af547edb32ea94 SHA-256: d3d1b80565bb29f683641b3d4cf7a6f2c125955fcc985907f6c10b861e550f3c
140 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 macros, specifically an Auto_Open function. This function is known to be used to execute arbitrary code upon opening the workbook. The critical heuristics indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting it's designed to download and execute a secondary 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
28663d664830d87535fb3c6b3a5fdcae8c1bed5a29b837abc393fbc6d127f4c3		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6768 bytes

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