Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e1963a5f96975e55…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:34 Authoring application: Microsoft Excel
MD5: e765220c72a0ef2f19afe9d6142421ed SHA-1: b3f7e7e9269c0a94efb97a8c44a59280fffac30f SHA-256: e1963a5f96975e55d7d9a9c77cd7497a06b934dbcda1f8e20c2de3ae504787f6
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 defined name, which is a critical finding indicating potential for automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands. This points to a macro-based downloader or dropper, aiming to 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
3da6ed23a4e9414cef35a8117854c69d14a88796f638d183de2770e87b222f04		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6513 bytes

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