Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 ec1724cb5849806e…

MALICIOUS

RTF / .DOC

1.85 MB Created: 2019-09-17 13:59:00
MD5: 4fa4cd0b4033855d757061119f34119a SHA-1: d9a764016319a0ea36e3dc886b74843206c374ed SHA-256: ec1724cb5849806e785d30bf99a18ac7c2e16aea3ab3e3428621e11b2188c3d1
200 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059 Command and Scripting Interpreter

The file is an RTF document containing an embedded OLE object, specifically triggering heuristics for Equation Editor and the CVE-2017-8759 vulnerability. This indicates an exploit designed to achieve code execution upon opening. The presence of \objupdate suggests an attempt to automatically activate the embedded object, likely to download and execute a secondary payload.

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_off001ce57e.bin
da659ab039b8e3dbf384b3d04c049876cbde720fb99444b397655337bc423f78		 rtf-objdata-decoded RTF \objdata at offset 0x1CE57E 3739 bytes

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