Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 65ceef48578b18d4…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:40:12 Authoring application: Microsoft Excel
MD5: bfb5fbc09f627b23a50ced0fa4c6c76d SHA-1: a57011a88a0fdd024798c29f1d074c04e96032a3 SHA-256: 65ceef48578b18d46742207852b08c999dae0c286f54d73532988a62ed1be8ba
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 (XLM) macros, specifically an Auto_Open macro. This indicates the file is designed to automatically execute code upon opening. The presence of dangerous formula APIs in the Auto_Open macro suggests it's intended to run arbitrary commands, likely to download and execute 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
7edc73398194f00fc84535983f921b9be94fb8a56a46f637276808cc7e59593d		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6782 bytes

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