Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b82beab6ba1cc191…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:40:00 Authoring application: Microsoft Excel
MD5: f971f9114c3213c9ce894caf939e83f8 SHA-1: 0be726316572a259902f1ca66308c3730e1651a5 SHA-256: b82beab6ba1cc1911f14e2e41e2011613fa8305c3939fef79bb68be9207327de
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name and dangerous formula APIs, specifically 'RUN'. This strongly suggests the macro is designed to execute a payload. The macro sheet itself contains numerous obfuscated string constants, likely used to construct commands or URLs for a second-stage download and execution.

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
7f01db4e23fbfc530f1ae4d274beb6843630db211225c98e01e7a9eca8a5e77b		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6964 bytes

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