Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 2d48431a55c852f8…

MALICIOUS

Office (OLE) / .XLSX

36.0 KB Created: 2020-11-25 10:39:32 Authoring application: Microsoft Excel
MD5: dba7fe76d5c02f6a8b42e181e382a212 SHA-1: 7bacf1b7cb3c076edd42687ae4cdf8b8b6633ac0 SHA-256: 2d48431a55c852f89df22b3cb3acc9907e85bcb14e0325e11132c7f9d436e604
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding. The macro sheet includes calls to dangerous formula APIs, including the RUN function, indicating an intent to execute arbitrary commands. The presence of an Auto_Open macro suggests the file is designed to run malicious code automatically upon opening.

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
603c8616f763bacbf462c34e20ad999a8902a4adc6fba2ff1902d48ef751ac1b		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6655 bytes

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