Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 462d0d78a828462f…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:41:58 Authoring application: Microsoft Excel
MD5: 4f162f7597731bb0ce4aa4fb1813504c SHA-1: 593cb3f107412479cd62412e86187819390dc8bc SHA-256: 462d0d78a828462f6e880accfa25a014bf80340e3aaa062a8023720c9c0264b5
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open function. This function is designed to automatically execute when the workbook is opened, indicating an attempt to run arbitrary code. The presence of dangerous formula APIs within the macro further supports its malicious intent.

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
782e0f84e8190f6f9fd968b16eaefa2fd83f59e23b8437b8d132f8c2b8ac767c		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6652 bytes

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