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

Static analysis result for SHA-256 523e446a1cbe41e3…

MALICIOUS

Office (OLE) / .XLS

137.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 6675cc1be33d5d22f8e66041e5b9f900 SHA-1: dc392f5d0a09db5126e4e993457531e481618ba5 SHA-256: 523e446a1cbe41e348b9c5ea90ea76730786ec8cf951d0a75e66d6b3a0ce20d3
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1071.001 Web Protocols

The file contains VBA macros, including an Auto_Open subroutine, which is a common technique for executing malicious code upon opening the document. The macro references the URLDownloadToFile API, indicating its intent to download a payload from one of the embedded URLs. The script itself is truncated, but the presence of Auto_Open and the API call strongly suggest a downloader functionality. The embedded URLs are the primary indicators of the next stage of the attack.

Heuristics 6

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • 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://190.14.37.187/
    • http://94.140.112.126/
    • http://185.141.27.213/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
61c6032b99fa0ef978378e1be8c1b924c7ca668abf2d2a64e0173d522f207b34
vba-macro oletools.olevba.extract_macros (decoded VBA source) 3590 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 shell/COM execution token(s).