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

Static analysis result for SHA-256 cf7373204fc102aa…

MALICIOUS

Office (OLE) / .XLS

1.05 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 3c31b1b6455e98d02fde97673287f260 SHA-1: 10eb67ae8645458996d5eeb3101504ceaf446d85 SHA-256: cf7373204fc102aa8f3d4ea5a8ac56db2d6227f0e9610c8089dfca7b3477034a
130 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1059.005 Visual Basic

The critical heuristic firing for CVE-2017-0199 indicates that the OLE2Link object is being used to load a remote resource. The extracted URL is highly suspicious and likely serves as the initial download point for a secondary payload. Although VBA macros were present, they contained no executable statements, suggesting the exploit is leveraged directly through the OLE object.

Heuristics 3

  • OLE2Link / URL Moniker → remote loader — CVE-2017-0199 critical CVE likely CVE_2017_0199
    Document contains an embedded OLE link object whose URL Moniker points to a remote URL. When the host file is opened, Office follows the link, downloads the URL, and processes the response based on its Content-Type (HTA -> mshta.exe, RTF → Word, etc.) — the documented CVE-2017-0199 primitive. The URL extension is not a reliable filter; servers can return different payloads to Office's user agent.
  • ClamAV: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
faef16cfc3b69e6dacc60198a7ccc61c4bb61c8632529929cd74db2189ccdc82		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 906 bytes

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