Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 0c051e53efb2edb9…

MALICIOUS

Office (OLE) / .XLS

170.0 KB Created: 2009-08-02 04:12:59 Authoring application: Microsoft Excel
MD5: f68bbf44ef609d56c15a5ce89628c652 SHA-1: 50c34179e804f198ab535a0158b06fdecaad130f SHA-256: 0c051e53efb2edb9314d0b69ff6f6b0845c4ef96235419e69e661aca7a81addf
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known method for executing malicious code. The critical heuristic firings indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting it is designed to run arbitrary commands. No specific malware family could be identified.

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
f47db2cfc23dfd158c86f5c3598e109a7bf618ffdff89cc82e195e8ef2a6f65b		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 82412 bytes

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