Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 deecd49e48569da5…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:32:08 Authoring application: Microsoft Excel
MD5: 9c7085389c53a700ea0f6ad84094af45 SHA-1: 65e9d4c0c2ed7781bbf83e2449b1ba8558ea02b8 SHA-256: deecd49e48569da57f54078d4eb548bc15bb796531d50e1c2cfcfa2db8523abe
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 configured to use dangerous formula APIs like RUN. This strongly suggests the macro is designed to execute arbitrary code, likely downloading and running a second-stage payload. No specific family could be identified from the available 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
07bcbe393ae9b7ca105ff8d64994039e45c1cbaf1823f5404c28777406039a1a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6552 bytes

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