Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 faef7e4a7e4b58dc…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:46:04 Authoring application: Microsoft Excel
MD5: 78bb142ebca70ea4215c7e52422b3429 SHA-1: 822cce7da5552b26321ab33fa9e3fc58f8733248 SHA-256: faef7e4a7e4b58dc4040da071982e04bab91ae80aeb170dd7d4f57259fad1eca
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-enabled document detected as malicious. Critical heuristics indicate the presence of an Auto_Open defined name, which is a common technique for executing malicious code upon opening the document. The macro sheet contains references to dangerous formula APIs, specifically 'RUN', suggesting it is designed to execute arbitrary commands or download additional payloads.

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
7443a1ebbbf2477618c297e52495a359b8ba7801e5ffff5aedcf86a905ea3452		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6772 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.