Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 94c44883536d1e3c…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:40:47 Authoring application: Microsoft Excel
MD5: 5d75be100260055c4ebc572168c23033 SHA-1: d8b07eff6861699f9a131d4be50bbff5ad6a8f4c SHA-256: 94c44883536d1e3cee76df9aa7505836833bbc9c0d0703afaed532ef4b7cc373
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a critical finding. This indicates the file is designed to automatically execute code upon opening. The presence of dangerous formula APIs like RUN further suggests 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
11b7262d3507b459bdd7cb183f042d69afa9e13f7526013f6fcf9dfc2cfb42e7		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6514 bytes

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