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

Static analysis result for SHA-256 d90224d38097a3a3…

MALICIOUS

Office (OLE) / .XLS

180.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 9825ea7d46fb9e68c00ed4ab646d8299 SHA-1: d8613185571cc130835d987cd2652564dae50349 SHA-256: d90224d38097a3a358dfde2182ec23c725c141f26b8155bbc3cadfb5e23a7c21
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample contains Excel 4.0 macros, specifically an Auto_Open function, which is a known technique for executing malicious code. The macro is designed to bypass security by instructing the user to enable content. It attempts to download a payload from several suspicious URLs, including 'http://vts.us.com/ds/0104.', 'http://mundotecnologiasolar.com/ds/0104.', 'http://accesslinksgroup.com/ds/0104.', 'http://ponchokhana.com/ds/0104.', and 'http://comosairdoburaco.com.br/ds/0104.'. The presence of the Auto_Open function and the lure to enable macros strongly indicate a downloader attack pattern.

Heuristics 4

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
917baaae0e48794e5eb73ae3d5cf93c43110b97da5df3e45bc2f236b5551c875		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 27158 bytes

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