Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bdf5294285e2792c…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:45:46 Authoring application: Microsoft Excel
MD5: 9fb9f5ccc0af9acbc28bef2fe4bdcf29 SHA-1: aaed45346180ebfd2cf81cf00e86f4eebb58a27c SHA-256: bdf5294285e2792cf563b246673ab836bcf9cf8a9b3065cc45711111decd17a5
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. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. While no specific URLs or hashes were extracted, the Auto_Open macro is a strong indicator of malicious intent, likely to download and execute 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
74dd5ce5deb8874ec9cebb9359c4e92647d24ac7c1e0b7a473ef853464c838f8		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6682 bytes

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