Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 26418c7c20869cbb…

MALICIOUS

RTF / .DOC

743.1 KB Created: 2019-09-17 13:59:00
MD5: a54a3a1efca2b09c8b4a6d836b267caf SHA-1: 7691348291041a4e4635603606d155ff4812486a SHA-256: 26418c7c20869cbbdc3124b803bee36063375cc2b4ab80e54e6c8e608a5c3cf8
200 Risk Score

Malware Insights

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

The file is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor. Critical heuristics indicate exploitation of CVE-2017-8759, a vulnerability related to MSXML SAX OLE activation. This suggests the document is designed to deliver a malicious payload by exploiting this known vulnerability when the OLE object is activated.

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_off000ac9db.bin
18cff3ff73ecea79edf4c37e9fe1de38023709f567e14d4a3cd4387c5e2d1e67		 rtf-objdata-decoded RTF \objdata at offset 0xAC9DB 3732 bytes

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