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

Static analysis result for SHA-256 e2f503770866816f…

MALICIOUS

Office (OLE) / .XLS

111.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 1a5c416ad5811a9e8f396fa5377a0db0 SHA-1: e783228e6889a9a8107ab0de49f5c71916593795 SHA-256: e2f503770866816fe0a27e4ec086af27858e42c0595fd43ebb31dcd6abfba7e8
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1105 Ingress Tool Transfer

The file contains Excel 4.0 macros, specifically an Auto_Open function that utilizes dangerous API calls like RUN. The macro is designed to download a DLL payload from the URL http://tetek.ru/ds/041220.gif and save it as cOhtfBj.dll in the C:\gHnbfKt\ directory. This indicates a downloader functionality, aiming to fetch and execute further malicious content.

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://tetek.ru/ds/041220.gif�
    • 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
ca597e9bca3d8a4ee9cd5312c7effa3cf44e1390af76df3b9ea96d5e2c882e13		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2082 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).

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