Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 718e5c7416fd3e04…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:49 Authoring application: Microsoft Excel
MD5: 30f942ab83aed5080c287bf1f669dbff SHA-1: 085b5bc12af54e96abda7a152dcc458df1916d02 SHA-256: 718e5c7416fd3e04d624d70a8fd5b1e979e5f0b84abe38e474e1da97b097dc51
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 (XLM) 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. 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
d5b47203ee9c1b6d5d54b2c30e82116e2a297f2ad03a79696eccdad465881a52		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6376 bytes

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