Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 89d3e6306342c16c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:29:11 Authoring application: Microsoft Excel
MD5: 12cfb99306179a63a0ed3281cd7791c2 SHA-1: 4687daaec5741fb9169c685e37bb18f043ba1629 SHA-256: 89d3e6306342c16c5dfa4d8fc0d1d39e2be2d018e5f711fecaef0e72dbe10c7b
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open function, which is a common technique for executing malicious code upon opening. The presence of dangerous formula APIs in the Auto_Open macro indicates a high likelihood of malicious intent, likely to download and execute a secondary payload. The obfuscated document body content does not provide further clues to the specific lure.

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
7655bbafed9a62686981dc6f829c8296428f3ce1a8acfe516d18e7231b84beef		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6594 bytes

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