Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 920e5804b5420523…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:43:56 Authoring application: Microsoft Excel
MD5: d6275bc3fd5253a012fa32b16cebece7 SHA-1: 52cf962ca1d13edc113408c9db0aabed15a72d5b SHA-256: 920e5804b54205235a79ada1108947980f4e5a0e6a036ab1ea149ec1e8a41bfd
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open function. This function is designed to automatically execute when the workbook is opened, indicating an attempt to run arbitrary code. The presence of dangerous formula APIs like RUN further supports the 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
5c4434b7d2f1a933e554dafbdcd323eabd62bf31736816754f61cdabf2011436		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6849 bytes

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