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

Static analysis result for SHA-256 ce3ef0f989fb870b…

MALICIOUS

Office (OLE) / .XLSX

1.01 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 2c85440bb7983bbcda4cfb9f2350f95f SHA-1: ae1f72edfd479dcf08cb80ea8bea1bc5429c1dbc SHA-256: ce3ef0f989fb870bb0258926e344421055dbe53067e06b5635ca7931b2fb0bc5
128 Risk Score

Malware Insights

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

The critical heuristic firing for CVE-2017-0199 indicates that the OLE object is configured to load a remote resource. The extracted URL, https://jktc.pro/yyKnY4?&blow=cold&peacoat, is highly suspicious and likely serves as the initial download location for a secondary payload. The presence of VBA macros, though not directly executable in this case, further supports a macro-based delivery mechanism.

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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