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

Static analysis result for SHA-256 5baeffb847a3a202…

MALICIOUS

Office (OLE) / .XLS

77.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-05-24
MD5: 1c0d8e9f4f12fd709e62d238e6535876 SHA-1: ab17dad8e7a97a38be2e400a3e075ff8dd216856 SHA-256: 5baeffb847a3a2021c85b4712f5c305477ceb0ba529503294c0b217e2f6b0bb7
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 entry point, which is a known method for executing malicious code. The macros likely download and execute a second-stage payload from one of the embedded URLs. The specific nature of the payload is not discernible from the provided evidence.

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
2ca0966e93dacad101ceb18f4d58731b5432892fe851526f2fda59486181312c		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 7325 bytes

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