Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 96460572c8ec6f0b…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:42:34 Authoring application: Microsoft Excel
MD5: 32d67a3d8ea47b001068d864c492cd9a SHA-1: d610382881a7b2eb10276c3cab7cc7d903e0818e SHA-256: 96460572c8ec6f0b8cf541c46164d3073d226163364a1fa46de55b4d39e4c7de
140 Risk Score

Malware Insights

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

This Excel 4.0 macro-enabled document contains an Auto_Open macro, which is a known technique for executing malicious code upon opening. The presence of dangerous formula APIs, specifically the RUN function, indicates an intent to execute arbitrary commands. The macro sheet itself is obfuscated, but the Auto_Open entry is clearly identified, suggesting a downloader or initial execution vector.

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
fb5159c3490bdeec59d9af65bfa84ecf6d055a3301e058d7e5cf386d595f4eba		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6549 bytes

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