Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 35588f17b618f085…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:23 Authoring application: Microsoft Excel
MD5: 19724a92238e75cd30e6a3386028b22c SHA-1: 977aa337c5df679190e9962321370503c1f1000e SHA-256: 35588f17b618f085369611d0b430714c8748285dce50ab27dfbfe52e71015610
140 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 macros, specifically an Auto_Open function. This function is designed to execute automatically when the workbook is opened. The presence of dangerous formula APIs like RUN indicates that the macro is intended to execute arbitrary code, likely downloading and running a second-stage payload. No specific family could be identified.

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
0d1498748a907a2df30199d646c53de011acd1d83d63348667334b2cc3d530f8		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6387 bytes

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