Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 8834d747de85d765…

MALICIOUS

RTF / .DOC

1.18 MB Created: 2019-09-17 13:59:00
MD5: 5dc15808e2748cdf70a88d94e9808c9d SHA-1: 19d0bfc08b2773bee76cce5cdfed141236df486f SHA-256: 8834d747de85d765dc71c83fcc676b53b72d76875735fa6de894da7d9246f546
200 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter

The file is an RTF document containing an embedded OLE object, specifically triggering critical heuristics for RTF_EQUATION_EDITOR and CVE_2017_8759. This indicates the document is designed to exploit a known vulnerability in the Microsoft Equation Editor component to achieve arbitrary code execution. The presence of objupdate further suggests that the embedded object is intended to be activated automatically upon opening the document.

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_off00125e0b.bin
f8593cfbe3d57a9de24650e1ec48824d03d7953015145caa98a9ce47c6e50a46		 rtf-objdata-decoded RTF \objdata at offset 0x125E0B 3739 bytes

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