Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5da9fe7bf9d9c00d…

MALICIOUS

Office (OLE)

171.0 KB Created: 2020-05-14 09:43:15 Authoring application: Microsoft Excel
MD5: ee3a1365329e98d3f2da9bd17c98500b SHA-1: 1cf38e3f1794d3355267ce79ebe4cd0dc6324837 SHA-256: 5da9fe7bf9d9c00da5855f2ad32656d9a1f2e945444fb5cb88e961a0b298970a
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. The presence of dangerous formula APIs like RUN (38) strongly suggests that the macro is designed to execute arbitrary commands. This is a common technique for downloading and executing further stages of malware.

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
f3e83c322ff69e45312f6f1c9f3502bdb3f6c5226910a6dbe56ab10d36bc520a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 129297 bytes

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