Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 efbb8e768e9779fc…

MALICIOUS

Office (OLE)

171.5 KB Created: 2020-05-14 09:47:21 Authoring application: Microsoft Excel
MD5: d08fd1a5ba871ceb3baa2c2225858c49 SHA-1: ea170db52701ffaa04e66fdb1eaf74d5f1fd61b8 SHA-256: efbb8e768e9779fc1794dfe75824c34a8ea39d7a9678c78c386dfe71fd676436
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is an Excel 4.0 macro-enabled workbook. Critical heuristics indicate the presence of an Auto_Open defined name and the use of dangerous formula APIs, specifically the RUN function. This suggests the macro is designed to execute arbitrary commands upon opening the workbook, serving as a downloader or initial execution vector. No specific IOCs beyond the function name were extracted.

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
c04d97a9a87c5d176e8a7e1d43c752620cb7419b8fd07d5ac519c8c7a633cdf7		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 130969 bytes

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