Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c3e9f8f223035b64…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:30 Authoring application: Microsoft Excel
MD5: b2bc6b1db6a26485c9398e1453cb67a3 SHA-1: 64359e55cd7e7a3ff7bb7c5d71833110b4bf337a SHA-256: c3e9f8f223035b649ec8f0f3d8bf8dfc3300dff6306a97e3dfd2cc3cf0fafd1e
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 finding indicating automatic execution upon opening. 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. The document body contains obfuscated text, further supporting a malicious intent.

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
799b38312946a94b07c7f2e74719174c83bae7ab35f1bbbff23d91c5b97fb936		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6765 bytes

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