Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 58bbe1769987c680…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:45:44 Authoring application: Microsoft Excel
MD5: d04296780fe35a8967052087f0647ebf SHA-1: 5b8956b72f108c2d325158e0c5c8f718569fddff SHA-256: 58bbe1769987c680f835fb258e05e43df22f878b49e0daaeedc0c767393b49d9
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute external commands. This points to a macro-based downloader or dropper, aiming to execute 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
18cd9c2abcbdbcfdc5738a6352ee261fa2ed38e57d36f2e6080752159402cc6f		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6816 bytes

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