Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 06d627a19b9a5408…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:47 Authoring application: Microsoft Excel
MD5: 9881adbae2aedf3d6f849960479edb06 SHA-1: ddd87c969aa3c2e05acc7947bf02d34262108afe SHA-256: 06d627a19b9a54088fd117ef0846aaf767cdbc85782753929c23a670ba8669b1
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 defined name and dangerous formula APIs, specifically the RUN function. This strongly suggests the macro is designed to execute arbitrary code upon opening the document. While no specific payload or URL was extracted, the pattern is consistent with a downloader or initial execution stage for further malicious activity.

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
705bb6e8240b93812b3742004e5a6b0f88b73331806cd52f4acc13e7d4339fe4		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6525 bytes

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