Malicious RTF — malware analysis report

Static analysis result for SHA-256 e5ceebe2e7ddfff5…

MALICIOUS

RTF

50.0 KB Created: 2018-04-12 12:42:00 First seen: 2019-04-18
MD5: 9e84e37cb3557cd1a35994cb83fe97ec SHA-1: 3213e6b33870f80ee606b025c955381b637e4f06 SHA-256: e5ceebe2e7ddfff58345273db780e5e84418c32beda6d3f281fc2f8abaa2d863
282 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains critical vulnerabilities, specifically CVE-2017-0199 and CVE-2017-8759, which are known to be exploited for remote code execution. The embedded URL http://10.99.11.53/htatest/alert.txt is likely used to download and execute a secondary payload, indicating a downloader or dropper functionality.

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 / remote URL Moniker) critical CVE likely CVE_2017_0199
    RTF contains a URL Moniker OLE link whose decoded target is remote. Office can fetch and process the response through the CVE-2017-0199 OLE2Link attack path, but the server-side content type is not proven statically.
  • 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://10.99.11.53/htatest/alert.txt In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002c98.bin rtf-objdata-decoded RTF \objdata at offset 0x2C98 3202 bytes
SHA-256: 43a50c91d573a27d257cefb3d00a4800b2de0ea0cadef21606ca782a0551e6cd

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