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

Static analysis result for SHA-256 75002f20cd76c280…

MALICIOUS

Office (OLE) / .XLS

139.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 4ad809185810ce924a96d99e23400ad1 SHA-1: 33784a44312fa7d6a8b534450aa7f02ab710f3cb SHA-256: 75002f20cd76c280642f70fdf8e0889eb250d773301929b351ab8c19a16dc33d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet that uses an Auto_Open macro to execute. It contains a lure to enable macros, a common technique for malware droppers. The macro is designed to download a second-stage payload from the URL http://zltw15tzezi03nbmru.xyz/w., which is a critical finding.

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
d58bf7b1c551d9ed6ccc6b340219b321efb792dcd316fba11c5b3b845793fadb		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 4547 bytes

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