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

Static analysis result for SHA-256 b870411bb9f5afa3…

MALICIOUS

Office (OLE) / .XLS

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 2bb929d2b6473f1f0aef8062a2bfd7ec SHA-1: 4cb7a592da48d1761a329a23fb2ea8d3c5cc2d98 SHA-256: b870411bb9f5afa36e27c1ced75f86a6109b33d8969ddb064cf08b5a07a05ec7
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The file is a malicious Excel spreadsheet containing VBA macros. The macros utilize the URLDownloadToFile API, indicating an intent to download a second-stage payload from one of the embedded URLs. The presence of Auto_Open and Auto_Close macros suggests automatic execution upon opening or closing the document. The ClamAV detection as 'Doc.Downloader.Docusign112100-9908075-0' further supports its role as a downloader.

Heuristics 7

  • 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
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://101.99.90.18/
    • http://194.36.191.19/
    • http://45.144.29.109/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
1d960f6caac53d8c2251599c53022cfdbc7f6e2862dcf129a8d44776b9a41f22
vba-macro oletools.olevba.extract_macros (decoded VBA source) 5309 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).