Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2333addd2ddd2f6d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:21 Authoring application: Microsoft Excel
MD5: 48431de25911a021d16cf3c07f078640 SHA-1: c8dc78afbabf927c2e358308640a6595671fa920 SHA-256: 2333addd2ddd2f6d5a21eaf9ec9cfb5e4a6fb67a766fc5da7aa91189a826d3c3
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. Heuristics indicate the presence of an Auto_Open macro, which is a critical finding. This macro likely executes dangerous formula APIs, such as RUN, to download and execute a secondary payload. The document body contains obfuscated text, suggesting an attempt to hide malicious content.

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
8aeda838cbc00e6bf9bdbad50a1d685b54a283d5ae331ae54be8a02bd398daba		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6502 bytes

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