Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b0760728d6d605b1…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:39:44 Authoring application: Microsoft Excel
MD5: cc99c79557c6fd07dfdb3be99d419c86 SHA-1: 0b2f5fbfeef2af5bfd6d4795fa707b4d7ee49d0b SHA-256: b0760728d6d605b13e3f4815a7c9f771926328ece864b4dcdecd5d5477f3a8df
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook detected with critical heuristics for OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN. The presence of an Auto_Open defined name indicates that the macro will execute automatically upon opening the workbook. The dangerous formula APIs used suggest the macro is designed to execute arbitrary code, likely for downloading and running a second-stage payload.

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
5664feb92f4f8228601d8240f66f56ee9ca063c4b8b0b36a1336d273eadf1b80		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6601 bytes

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