Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 4c7359a9d7e3230f…

MALICIOUS

RTF / .DOC

688.5 KB Created: 2019-09-17 13:59:00
MD5: 0e4a6d5d131e54210f4751dae64ab5f0 SHA-1: 8f6cd02c52436318419dd60699c251766ede9adb SHA-256: 4c7359a9d7e3230f6d6041cc968497f690c589c68245614a117aa34f0841b0ab
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The file is an RTF document containing an embedded OLE object, specifically targeting the Equation Editor vulnerability (CVE-2017-8759). This indicates an attempt to exploit the Equation Editor to execute arbitrary code upon opening. The presence of ".objdata" and ".objupdate" heuristics further supports the exploitation of OLE object activation. No scripts were extracted, and the document body was heavily obfuscated, but the critical heuristics point to a classic exploit delivery mechanism.

Heuristics 6

  • 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.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • \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 OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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://schemas.microsoft.com/office/word/2003/wordml

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000a5619.bin
4f1ce7d0670067fb7dfea949011414e78fe4630cb6c29b602df7d62748f23c22		 rtf-objdata-decoded RTF \objdata at offset 0xA5619 3739 bytes

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