Malicious RTF — malware analysis report

Static analysis result for SHA-256 82fa6a7b7cd4f9c1…

MALICIOUS

RTF

55.4 KB Created: 2018-04-12 14:16:00 First seen: 2019-06-27
MD5: b0182a35b4b1efda085a1f64398edfe2 SHA-1: b122b6b0af33aa25ea2e4c9e8b56b99ec33d7ea2 SHA-256: 82fa6a7b7cd4f9c1c10e1f01be3ed85fc88ca4c83e755cf620f330131054877a
282 Risk Score

Malware Insights

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

The RTF file contains critical vulnerabilities, specifically CVE-2017-0199, which is used to automatically link and update an OLE object. This mechanism is leveraged to download a secondary payload from the embedded URL http://10.99.11.53/htatest/alert.doc, indicating a likely exploit delivery attempt.

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.doc 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_off00002b28.bin rtf-objdata-decoded RTF \objdata at offset 0x2B28 2601 bytes
SHA-256: 8a4c94401347254b9b0ec62e5f0a288a1918287573caa646d379f41cc5cbcca3

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