Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9f7932a4f7b174c1…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:33:55 Authoring application: Microsoft Excel
MD5: de7ab5045d23659b6fa7d838c3949fcb SHA-1: bfe7d010e7734f2966108f185af4e31088c832ea SHA-256: 9f7932a4f7b174c1bb089fbabe01b65520bba9c55453070dea9d83e8ed2d78f0
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 macro is designed to execute dangerous formula APIs, indicating an intent to run arbitrary code. The presence of an Auto_Open entry strongly suggests the macro will execute automatically upon opening the document, likely to download and execute a secondary payload.

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
e8d4bfd7242edf4a5cbbc3516915372459b47a62702395e451841b1ebb5a7075		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6690 bytes

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