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

Static analysis result for SHA-256 bb4a24b14a4e9ba9…

MALICIOUS

Office (OLE) / .XLS

320.5 KB Created: 2021-02-03 13:09:28 Authoring application: Microsoft Excel
MD5: c5de89a5fe948eaa3e6c012dcc78eb4e SHA-1: 9af0a71cfed9cceb7bf9fd6779170cc6fd19e2a1 SHA-256: bb4a24b14a4e9ba9d09d6034d19db294e65c320c0e842f3f9d757dbfbfc10b7b
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1105 Ingress Tool Transfer

The file is an Excel 4.0 macro-enabled spreadsheet. Heuristics indicate the presence of XLM macros with dangerous functions, specifically the RUN function, which is often used to execute downloaded payloads. The embedded URL and the DOC BODY excerpt suggest the macro's intent is to download a file from 'https://kabinarf.ru/ds/0402.gif' to a local path, likely to execute it as a second-stage payload. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' further supports this downloader functionality.

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://kabinarf.ru/ds/0402.gif�
    • https://kabinarf.ru/ds/0402.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
ce26c341afc1e63329d43ef04ff6597043d6673580fa51e0c562467c637ad545		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3309 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).

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