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

Static analysis result for SHA-256 09eafcde17b69cdb…

MALICIOUS

Office (OLE) / .XLS

86.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 5e859daee19655d7dd942b0c414bc753 SHA-1: f43c7c5aa633ba161eaebd09316a4949bca8e061 SHA-256: 09eafcde17b69cdb1de3d8230b9367c91627d50145c307ddc98564bf5f4cb5e8
162 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open function, which is a known technique for executing malicious code. The macro is designed to download a file from the URL http://rea26ypgvle02hcbunp.com/fera/frid.gif, likely to execute a second-stage payload. The presence of a lure to enable macros further supports its malicious intent.

Heuristics 5

  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://rea26ypgvle02hcbunp.com/fera/frid.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
7c4e6e8611159b572e384e022cb7e9edbaa0a964189883c047d79a06d41903f6		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2390 bytes

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