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

Static analysis result for SHA-256 dd3bbce4c5ad7dd7…

MALICIOUS

Office (OLE) / .XLS

139.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 491f8f076ee4c8504ab091dc301ff206 SHA-1: 1fc006182c646b1fbed9315e7831be630351137b SHA-256: dd3bbce4c5ad7dd71ad4c5664758d6529a241ef2b48241d18b5a87b5c53760ea
160 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled spreadsheet that attempts to lure the user into enabling macros. It contains an Auto_Open defined name which executes dangerous formula APIs, specifically the RUN function. This script is designed to download and execute a second-stage payload from the URL "ttp://zltw15tzezi03nbmru.xyz/w.gif". The presence of the RUN function and the Auto_Open entry strongly indicate a downloader or initial access mechanism.

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
a21ec7d0b94d7eda445c1d164dbe0d49a5b7d6c1e6ddd6821e30c54db6fd3bf2		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 4547 bytes

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