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

Static analysis result for SHA-256 362db18e6e623afd…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: b41f8d1e3cc8e8d05b22251c77a5ea6c SHA-1: a6401818e25d8dfd6df85191658689ff34cd7f59 SHA-256: 362db18e6e623afd6b2136e8271a9f15a34f22b4970c545c06d1b5cc559c8a09
160 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes dangerous functions like RUN and CALL. This macro is designed to execute a secondary payload by downloading a GIF file from a provided URL. The presence of ShellExecute API calls further supports the execution of external code. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' suggests a downloader functionality, likely aiming to retrieve 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
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • 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.
  • 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://fu5on.com/ds/231120.gif
    • https://fu5on.com/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
fc23abdcb2657b335d0fb386451be5be98110592c06d0600d83d33c16e5bacb2		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6295 bytes

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