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

Static analysis result for SHA-256 490a76a04c7616ef…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: bf448acbe7eedfc5ac679eef84ca08d7 SHA-1: 052abd47c9c7103e18be896349d3e3853ff88b8f SHA-256: 490a76a04c7616efe3e2496658fe25fbafedadddf14a23eae83856ed6c6e2dbe
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, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics. The SC_STR_SHELLEXEC firing suggests the macro attempts to execute external commands. The embedded URL points to a GIF file, which is often used as a lure or to host malicious content. The ClamAV detection further confirms its malicious nature. The macro likely downloads and executes a second-stage payload from the provided URL.

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://panzr.tech/ds/231120.gif
    • http://panzr.tech/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
c8b1e7a8344e098ddc3906ba00141dccfa02d07406793ff05618684390276899
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6057 bytes