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

Static analysis result for SHA-256 884ed32d1c6de038…

MALICIOUS

Office (OLE) / .XLSX

36.0 KB Created: 2020-11-27 11:41:00 Authoring application: Microsoft Excel
MD5: c6eff86d0c937a15e3b9b58c6449956e SHA-1: 069c306a6b97e9598a09b42adcb27ebb67ab2632 SHA-256: 884ed32d1c6de0382b9ba6c914220eb97d2d30d8b2968be0ae9f91612b141be7
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. Without further script content, the exact payload and execution method remain unclear, leading to an unknown family classification.

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
ba23e13fdcde92df5c2936d735e33929232f28a94f8938a637e803a82bda921b		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6546 bytes

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