Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5163bffde7ba6229…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:47 Authoring application: Microsoft Excel
MD5: bc9cce9d417862fe9cb5656c21763c2f SHA-1: 2814198e86ac88b73d223309c0ce225725479d7e SHA-256: 5163bffde7ba6229914bc241ec076514f09c3803e3848cf6859e805450e674c4
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, which is a known technique for executing malicious code. The macro sheet contains a reference to 'Auto_Open', suggesting it will run automatically when the workbook is opened. This points to an attempt to exploit client execution capabilities.

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
40bb6d24f5b3d63c151748c4fe49fcc9140998e7a0f8870e7d95b22cc16789bd		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6593 bytes

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