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

Static analysis result for SHA-256 90a9146af294adef…

MALICIOUS

Office (OLE) / .XLS

73.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 5de5e88facbf1bab98354f043490e3d5 SHA-1: 041d4db95ac59668125aad7464147939f5c01681 SHA-256: 90a9146af294adeff210b740abf343108177c8c6d2aa9404dd22c76ee7afa911
88 Risk Score

Malware Insights

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

The file is an Excel XLS document containing an XLM macro sheet with an Auto_Open macro. This macro is designed to execute dangerous functions, specifically the RUN function, indicating it's intended to launch an external process. The document also contains a lure to enable macros, a common technique for malware droppers. The embedded URLs likely serve as download locations for the secondary payload. No VBA macros were found to be executable, but the XLM macro is the primary threat.

Heuristics 5

  • XLM Auto_Open with dangerous formula APIs high 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
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.
  • 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://contra-banned.com/ekiofyqq/Dm
    • http://contra-banned.com/ekiofyqq/530340.png

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
7a73e775e944ace7a128cba086e7c669c2eed227bda731678313f8a752bf3ebb		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3658 bytes
macros.bas
6482afb86d2ec7f1f8e6e88f38c92a22a2ebc9e6374d8b382d22d7c86011f736		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3253 bytes

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