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

Static analysis result for SHA-256 52e0b5d39e9a9773…

MALICIOUS

Office (OLE) / .XLS

111.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: dea2166519409b96205775cc95abab6e SHA-1: a70da2919e3f81d3fd397435649097e296605536 SHA-256: 52e0b5d39e9a97736b03f2b0ac315bb874da3632574cdd252fd8b9138cc1b299
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell

The file is an Excel 4.0 macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro that uses dangerous functions, specifically the RUN function, suggesting it's designed to execute arbitrary code. The embedded URL and the extracted 'chtfj.dll' artifact are highly suspicious and likely part of the payload delivery chain. The macro likely downloads and executes a second-stage payload from the provided URL.

Heuristics 5

  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • 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.
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://p-clone.net/ds/021220&C51
    • http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
5b8ee446c468b2ea5bbfe45d64b6176f37697f5e55d56c4e4634d4a3967efbab		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1800 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).

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