Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 77673e9804df6957…

MALICIOUS

Office (OLE)

267.5 KB Created: 2009-03-23 07:50:40 Authoring application: Microsoft Excel
MD5: 09df19e4ff5e91ee215dd10497775a6d SHA-1: 94cbdd8df8d6f56ff1c5992b9e1ccb62cf95369d SHA-256: 77673e9804df69572eefb19bbafcb40c843187c7bb0a955bb95b469076e556b2
180 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. The macros utilize dangerous formula APIs, including the RUN function, indicating an intent to execute arbitrary code. This strongly suggests the file is designed to download and execute a secondary payload, a common technique for malware delivery.

Heuristics 4

  • 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.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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
4652902a108c03cba5fdeeca95610fb83a947ad12ac6788f89657f647eca62a4		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 18739 bytes

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