Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b0734059e5ba8756…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:37:15 Authoring application: Microsoft Excel
MD5: 89cdcb85a747c8f35dabfed0c25d6012 SHA-1: 234cb7dd02cfa7dfb177f92c018b243326cfad7f SHA-256: b0734059e5ba8756b726c49ba794efe357b7a563fa16cafe009b79147a4beac9
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry point, which is a common technique for executing malicious code. The macro sheet contains a reference to a dangerous formula API, suggesting it is designed to run arbitrary commands. The presence of an Auto_Open function points towards an attempt to automatically execute code upon opening the workbook.

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
c1b41399d4f94098ce0c1a64bccf7197d8cc7cd0d2ae97ba1ed86d9b0da1478f		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6635 bytes

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