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

Static analysis result for SHA-256 b83427ba8831f97a…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 70cc3a4ffcc6e541c8a7d620517284c4 SHA-1: 897fc20ad201df3f96fb5a68d6d9933360d60e21 SHA-256: b83427ba8831f97aebc65349f657e7b1a95b7563bcf9a4d5ee99616d871762e7
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 potentially ShellExecute. This indicates the macro is designed to execute arbitrary commands. The embedded URL is likely used to download and execute a secondary payload. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' further supports the downloader functionality.

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 http://me48.ru/ds/231120.gif
    • http://me48.ru/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
b1a92fcba2ebe2fa90d2bd7eccdde9a9cc031a83a8bf04784dc2cdcfbba2a01a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6292 bytes

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