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

Static analysis result for SHA-256 ab5152794ca45d67…

MALICIOUS

Office (OLE) / .XLSX

1.06 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: d4c6ac821c22be30144711786c736a1a SHA-1: 96e697734dd3dcc47ebbe6bb9d3f1055f096c4f7 SHA-256: ab5152794ca45d670ae3f13de6be92fb686c27705d2df9ce0c00f76717bc61f3
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File T1059.005 Command and Scripting Interpreter: Visual Basic

The critical heuristic firing for CVE_2017_0199 indicates that the OLE object is configured to load a remote resource via a URL moniker. This is a known technique for delivering second-stage malware. The extracted URL is the primary indicator of compromise. Although VBA macros were present, they contained no executable statements, suggesting the exploit is leveraged directly through the OLE object's vulnerability.

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
382fc1344a2f0cf6eda18645d41def8d571debc6637bc7fe02a5c83715a51bef		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2112 bytes

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