Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ce5fc4c9dd1e4c75…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:52 Authoring application: Microsoft Excel
MD5: 657160eea0692c3ad9a27ba5139ebb50 SHA-1: 92e66d13ceadaac23551a8781855a86942cdbf9f SHA-256: ce5fc4c9dd1e4c75708f2b2c86872c14758ce98ca0da40956fc6fb50e7d2318b
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 function, which is a known method for executing malicious code within Office documents. The presence of dangerous formula APIs in the Auto_Open macro indicates an intent to perform harmful actions. While the exact payload is not discernible from the provided evidence, the mechanism points to a macro-based attack.

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
fbe829c2a498ca5795e9cdbcc14307b89464163b29d26c25c85078cbc6d599bc		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6561 bytes

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