Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d677485497151cbc…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:37 Authoring application: Microsoft Excel
MD5: ce2afae947c019e41f37a949546d6c7d SHA-1: 9e591d2bfc2b1df5a79885f8271e8e87fbd2c03b SHA-256: d677485497151cbc32a61e8233565c8d4e3ba9ccfed45d7f345e08671ff52f79
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 sheet containing an Auto_Open function, which is a common technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs in the Auto_Open macro indicates a high likelihood of malicious intent. While the specific payload is not discernible from the provided evidence, the mechanism points to an attempt to execute arbitrary code.

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
4853f2f1a36e4badd6c9c9ffb9749081fb240c929acab21d3459b00929998917		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6638 bytes

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