Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fd1dd36ebf58969f…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:45:13 Authoring application: Microsoft Excel
MD5: 7ebdd8eb71bb9484696ab9ced219e832 SHA-1: ea511ffab37fca96771e9460e9e3a52f0c604eab SHA-256: fd1dd36ebf58969f546d6cf37dd8c2d3b264c0c43b079b38fe031892f5f45661
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 sheet containing an Auto_Open defined name, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs, specifically 'RUN=0', suggests the macro is designed to execute arbitrary code. While the exact payload is not discernible from the provided evidence, the technique strongly points to a malicious downloader or dropper.

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
72bfe01e3e931ecbf603e99c85fa268c33539ca5c872b63901fb2ca6097e5f69		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6582 bytes

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