Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5946de16fe81f12d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:25 Authoring application: Microsoft Excel
MD5: fa947d80fdbb05953ad83b01ad5fd9d5 SHA-1: ae955d13410187200c4cd779ba90177cd5048fb8 SHA-256: 5946de16fe81f12d70b9256dc214da33015eb1246693f66dc9dc499f688bb866
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. This indicates the file is designed to automatically execute malicious code upon opening. The presence of dangerous formula APIs like RUN further confirms its malicious intent, likely to download and execute a second-stage 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
c1d09c986a7ddb3dccd86f3bb90b0a9a8a0710b679bcd3a87bc36ce93643d4bf		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6458 bytes

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