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

Static analysis result for SHA-256 344a1f99e4916f2b…

MALICIOUS

Office (OLE) / .XLS

323.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: fb485ab3b3629e47f3a74d9ed04f3e67 SHA-1: da4cb6096d58cfc111d1f64dff2edf722f56747a SHA-256: 344a1f99e4916f2b88f098735397a2b4bb02179022dadb7d482fa8a8eb429183
340 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The file contains both Excel 4.0 macros and VBA code, with critical heuristics indicating the presence of dangerous functions and the use of URLDownloadToFile. The VBA script explicitly calls URLDownloadToFile to download a file from 'http://185.209.30.124/ds/11.gif' to a path specified in the document. This indicates the file's primary purpose is to act as a downloader for a second-stage payload.

Heuristics 7

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical 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.
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
c04c849ae1f787c2512637bb752e918fc988a62875e4485f65f0c7d5f4cb41e3		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1829 bytes
macros.bas
6bfaf31a3f01a65956c74843438e80d9cadf77db409b68b8bb334bb0357a6ef9		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1959 bytes

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