Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9205c3f5a488b576…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:05 Authoring application: Microsoft Excel
MD5: 64a210f425aec3c963deaf312592ce4b SHA-1: 482e1b3b83601d21b6afc7d35430f74a86e75cb6 SHA-256: 9205c3f5a488b576036f6a9958762cbdea566cc4a0a3f8caf84663b38daa3c9b
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 automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. While no specific URLs or hashes were extracted, the technique strongly implies a downloader or initial execution stage for further malicious activity.

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
7b6c7b76138b886d065330e1d8f28cf435e431e0b28512945ac6e14ac1eeadc0		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6727 bytes

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