Malicious RTF — malware analysis report

Static analysis result for SHA-256 a787053d9f6118e8…

MALICIOUS

RTF

75.6 KB Created: 2017-07-15 02:42:00 First seen: 2018-03-04
MD5: 37fc39943f8fe9b586df8f6c50a1fe4c SHA-1: eccd922ccc6abb219c22ca174d5b3bfd6def8428 SHA-256: a787053d9f6118e8f5faccc0fee7df750496f50fae4ef7ca073a95ce6daaa605
282 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains critical heuristics indicating exploitation of CVE-2017-0199, which is known to leverage OLE object activation to download and execute remote content. The embedded URL http://192.168.37.128:8080/KYg8mmfe.hta is directly associated with this exploit, suggesting the file's purpose is to deliver a malicious HTA payload. No document body text was available for analysis, but the exploit and embedded URL are sufficient indicators of malicious intent.

Heuristics 7

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • CVE-2017-0199 (OLE2Link / weaponized URL) critical CVE exact CVE_2017_0199_WEAPONIZED_URL
    RTF contains a URL Moniker OLE link to a script/HTA/template-style remote loader, matching the tighter static CVE-2017-0199 shape.
  • ClamAV: Rtf.Exploit.CVE_2017_0199-6335035-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_0199-6335035-0
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • 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://192.168.37.128:8080/KYg8mmfe.hta In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002b58.bin rtf-objdata-decoded RTF \objdata at offset 0x2B58 2601 bytes
SHA-256: af8bc81dbba4a3c0c5650d5da05b6bef7e3f2a1c941ce7a3c9219d0a1cc88349

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