Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 062ad65985fd4e9d…

MALICIOUS

Office (OLE) / .XLSX

36.5 KB Created: 2020-11-27 11:45:38 Authoring application: Microsoft Excel
MD5: 7cd1dcfa09a471a9d4f8efaf088204fe SHA-1: ba932f6dc2a741257c84b4e9be63b62173a38d24 SHA-256: 062ad65985fd4e9d7b951ab319079c74da69e2804dab3ff00a11707d4a4f9bb3
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 indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely leading to further exploitation or payload delivery. 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
01747949f76232a93891a14c2ae1df523b1fbe2f4d350a08ef2b4b0323896af2		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6745 bytes

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