Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 211d5b09f7012803…

MALICIOUS

Office (OLE)

170.5 KB Created: 2020-05-14 09:51:59 Authoring application: Microsoft Excel
MD5: 0ad564fe884f0e2685e1da50c192a914 SHA-1: b7ab5cb94080c45b2c0f918eece17fce7c236987 SHA-256: 211d5b09f7012803b2ff77402357facac88e47d8ed847da27cac0b44ea799dba
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell

The file is an Excel 4.0 macro-enabled workbook. Static analysis identified an Auto_Open defined name, which is a common technique for automatic execution upon opening. The critical heuristic firings indicate the use of dangerous formula APIs, specifically 'RUN=25', which allows for the execution of arbitrary commands. This suggests the macro is designed to run an external program or script.

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
0b31748a7acc4728e905449e8f4df754ec67d5e5c28b3e95792d21e000732efe		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 128326 bytes

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