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

Static analysis result for SHA-256 6349595b978d2128…

MALICIOUS

Office (OLE) / .XLS

130.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: d442bcab9d31368d5e2d7bd049800136 SHA-1: 47575ade3992f348e946f88cc755e4f1c32d02c7 SHA-256: 6349595b978d2128db7b3b406b141324c886653cdbf71a03b35b64bdc46268c8
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of Auto_Open and Auto_Close macros, along with a critical heuristic for URLDownloadToFile API, strongly indicates malicious intent. The VBA script likely uses these functions to download and execute a secondary payload from one of the embedded URLs. The ClamAV detection as 'Doc.Downloader' further supports this assessment.

Heuristics 6

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • ClamAV: Doc.Downloader.Docusign112100-9908075-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign112100-9908075-0
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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://190.14.37.118/
    • http://188.165.62.31/
    • http://101.99.90.226/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
500a51ed811e999a604194fea0844376d5acb6ec6f2fcd69eab1c1130e3db5e0		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4802 bytes

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