Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0bb56f0acc063a52…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:45:41 Authoring application: Microsoft Excel
MD5: b0fd0210856bcb67118cba0e2a49ab36 SHA-1: 396175f90a3ccbaca2eb5b5826eae1cd82a9f455 SHA-256: 0bb56f0acc063a5276cc2982677e0bb7a167e9387482dc128ce0c68fa710d2db
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 indicator of malicious intent. The presence of dangerous formula APIs within the macro sheet suggests it's designed to execute arbitrary code. While the exact payload is not discernible from the provided evidence, the mechanism points to a downloader or initial execution stage.

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
ed8df9a789d43387b51ad31c2de9087515f27072090496dba97ddc30f88a620e		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6566 bytes

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