Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6960e7e7fcb76daa…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:52 Authoring application: Microsoft Excel
MD5: b9f83ad918d4f735b5cb4bf504719d4f SHA-1: 3a00a5c20f15c7bd769984547500fadc8bdd07e0 SHA-256: 6960e7e7fcb76daad397f19738b82b6d4b7167faca5a71407c1fe7a2dd8870f0
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 defined name, which is a critical finding. This indicates the macro sheet is designed to automatically execute code upon opening. The presence of dangerous formula APIs like RUN further confirms the intent to execute arbitrary code, likely leading to the download and execution of a second-stage payload.

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
ff622f1779747461c548b0519ed91adf378fecae75693469d10d79b50b71e484		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6600 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.