Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5d18d5537db6baad…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:41:58 Authoring application: Microsoft Excel
MD5: 5c6b6e0f1d817b95962e7b5b941b2e67 SHA-1: cdbc1b956df71e11ea0198f70768192654b96829 SHA-256: 5d18d5537db6baadc505b79f36489da1c4330683a5a932edfbf0a3c30df2b14b
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 code. While no specific URLs or hashes were extracted, the technique strongly implies a downloader or initial execution stage for further malicious activity.

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
efe583e652585918458c4c203fc2da0dd360bb6edac1b1b604c1acdd55a6772e		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6838 bytes

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