Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 5d0792cdf9cbf95d…

MALICIOUS

Office (OLE) / .XLSX

36.5 KB Created: 2020-11-25 10:27:48 Authoring application: Microsoft Excel
MD5: 5191c20405f4e1721bd7b1d0e5296262 SHA-1: 95bc8356a18f192516a965add66e2cd8d6b6ad41 SHA-256: 5d0792cdf9cbf95dd6957cd0eadbcb2bdd9e3c7d4bbd434ec138dc865cbb119d
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 further suggests the macro is designed to execute arbitrary commands, likely to download and run a second-stage payload. No specific family could be identified from the available evidence.

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
d3a302cda2c65a8c7e8fb8aa75a010772bbc94ed034eb3483318c37920c8a0fa		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6460 bytes

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