Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1d9db36142b4b399…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:25 Authoring application: Microsoft Excel
MD5: 976b4065a0bea4184e8374ebd4e8a6ab SHA-1: 4fad3da25338f4690d5999bf437a31e12ea41ecc SHA-256: 1d9db36142b4b3996c69b74110fda23c03aac1451399c5aeb994e165ff4fa034
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 further confirms the intent to execute arbitrary code. This suggests the file is designed to exploit the Auto_Open functionality to deliver a malicious 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
d92b9f099cd4b92f57e894e5d8184d037c1df954f2740c86e949ee05bad2f98d		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6522 bytes

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