Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0bb7c72690981654…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:25 Authoring application: Microsoft Excel
MD5: 83910345113f6574d06c5151cc785bdd SHA-1: 03c2784f7b949f70d02ce3973803ad8d1da20548 SHA-256: 0bb7c7269098165483703ad36f6b6ffdb5c12102d617f3f81b263c530300b7cc
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open defined name, which is a critical indicator of malicious intent. This technique is commonly used to execute arbitrary code upon opening the document, typically to download and run a secondary payload. The presence of dangerous formula APIs further supports this assessment.

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
486cf89756f59573eaa1dd742ac51257a5424453a3cc27aa3ecf3fecafb5b61f		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6624 bytes

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