Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 48f6fd13e574d918…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:43:02 Authoring application: Microsoft Excel
MD5: 24c3546af255b3061c9984a94cf814c0 SHA-1: b832bd9188c388da763003f5ee2b0e6e2c529f53 SHA-256: 48f6fd13e574d918e1151b8eceb63b697af0ab003e681d5bf765b1e0472f1c0a
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 heuristic finding. This indicates that the macro will execute automatically when the workbook is opened. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely downloading and running 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
55f014aa24af49b003a5d2c32135dd31237fe8607db64ce12bc9d31f705d09bc		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6583 bytes

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