Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8f881366ca0d47fa…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:22 Authoring application: Microsoft Excel
MD5: 30cf3700c4d1d04d4675c8999b136e97 SHA-1: b206b670b3886f90ae777754b33fb87165d70b80 SHA-256: 8f881366ca0d47fa3dbe71fd8088a01d3acde8d40a390e7c77f974d4e2154282
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 finding. This indicates the macro will execute automatically upon opening the workbook. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands, likely to download and run 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
8b076d27dd5d5f03b0e55cb85b0b9610651dfd6fdf6fff2cc6184a6f65645dbc		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6538 bytes

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