Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 84f5728ea9d48b7a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:16 Authoring application: Microsoft Excel
MD5: f433613db84204a654ae9ce35a76149d SHA-1: 0a8043d0a89227298d47a52dd2ffe33bd3ca9092 SHA-256: 84f5728ea9d48b7a88d55be3aa201de8cdbe8321d172c9f1cd950508332d2deb
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 the macro will execute automatically upon opening the workbook. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely to download and run 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
1ec2d447d57e4553aad305b945ee3bfbed6f9b0c06133b44b38cae4e2fe614d9		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6390 bytes

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