Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e6fda356348e9ff7…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:40 Authoring application: Microsoft Excel
MD5: 4c72ad845295416156d9033ccb3b2b69 SHA-1: a62eedee9e0fa7a716b12d67d7aed838d7de31d1 SHA-256: e6fda356348e9ff7a2c47e30fce3b554808c2e241f603ca4e4511382bc43d360
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 function, which is a known technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN further indicates malicious intent. The macro sheet itself contains obfuscated data, suggesting an attempt to hide its true functionality.

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
634fb7f00767c3424b25ed7de4da968ffca8b292c2476ff54bb2630da386a0ed		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6672 bytes

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