Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 00ff7d9cfa9c2732…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:11 Authoring application: Microsoft Excel
MD5: e9462a17352852de7c6c962093ea3b18 SHA-1: a00005bf3acbf1eb31e372b589e5b02bd0ca2bfc SHA-256: 00ff7d9cfa9c27325b1eead56bb8c3218dc9f2e27074780995c5f466776b44da
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open macro, which is a critical finding. This indicates the macro will execute automatically when the workbook is opened. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely downloading and running a secondary 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
6358eeb7fa4cd915bacc15f6fa8c1e6aff41987aa7e40821ba193412395c96fb		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6833 bytes

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