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

Static analysis result for SHA-256 2ccaaa917b45597f…

MALICIOUS

Office (OLE) / .XLS

111.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 3954e5b0149f8744b2f45d892a664490 SHA-1: 9bfe6fe64e465afa84af67237730206c344e57eb SHA-256: 2ccaaa917b45597f435de752a54795c8fd59f23e16ea26b580b2d452fc5b0a52
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro that uses dangerous formula APIs, specifically the RUN function, suggesting it's designed to execute external code. The embedded URL and extracted file names (chtfj.dll, .gif) point towards a downloader functionality, likely fetching and executing a second-stage payload. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' further supports this, indicating a document-based downloader potentially related to DocuSign lures.

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 https://lenimar.com/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
19f0d6a8ff8412b2651baf15907a36db7b16853345fbe656e73e513621efb0eb		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1801 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).

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