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

Static analysis result for SHA-256 f6ff52c2a3407ed3…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 043959e5305f997a5012ab9a43c3fdfb SHA-1: 32fbaef99672dee1201c2ad525877e9c706f05e5 SHA-256: f6ff52c2a3407ed3f0fc8f2a5e4e009c9d6656c3dc2cadbce13f64c887baa012
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell T1105 Ingress Tool Transfer

The presence of Excel 4.0 macros, specifically the Auto_Open function utilizing dangerous APIs like RUN, strongly indicates a downloader. The heuristic firings for OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN, along with the SC_STR_SHELLEXEC reference, confirm the macro's intent to execute external code. The embedded URL likely serves as the source for the second-stage payload. The ClamAV detection further supports the malicious nature of this file.

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://chica.media/ds/231120.gif
    • https://chica.media/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
f47affe8c13bcf147c60cdfcb7548aa5c789e981f4872a53ebdda3b841e12f12		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6059 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.