Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a2fdb32c8fa002eb…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:25:22 Authoring application: Microsoft Excel
MD5: dd54392e44918b09c7f2ee4fcfccabab SHA-1: c8640a6ed61b1c74ac23dae762ef83f41f6f47b3 SHA-256: a2fdb32c8fa002ebb80829adf7d82544bc7432bc917d1eebd5b85818024828d2
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 secondary payload. No specific family could be identified.

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
42b23219e8642ad3df373ef50cfcb675ef84e59883137b6d703802d2ade5e82a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6464 bytes

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