Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a0d10c04025ada26…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:43:46 Authoring application: Microsoft Excel
MD5: 0ce8972402221d067ed8cd7c251d0993 SHA-1: 6323ce920cce73f179865eda2af7b320a30c85db SHA-256: a0d10c04025ada262c2795aa1d381b64557ad59ca818163ba15475aafab12161
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 like RUN suggests the macro is designed to execute arbitrary code. The macro sheet is likely responsible for downloading and executing a second-stage payload.

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
637ed9acde221bea866339383e38fc3d3fb1f85fd28e9f2c9261694c0d3b2722		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6571 bytes

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