Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 95aa889db4a6d029…

MALICIOUS

RTF / .DOC

827.9 KB Created: 2019-09-17 13:59:00
MD5: 97147bc6ee9cef5c4a446ca88a61d9c1 SHA-1: ab79d527741777887092648228a835667937e622 SHA-256: 95aa889db4a6d029de97e6dbc973874d10cb8e03921007b4f948b6930325ad89
200 Risk Score

Malware Insights

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

The file is an RTF document containing an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-8759). This vulnerability allows for the activation of OLE objects, leading to arbitrary code execution. The presence of RTF_EQUATION_EDITOR and CVE_2017_8759 heuristics strongly indicates exploitation of this known vulnerability. The embedded URL, while benign, is part of the document structure that facilitates the exploit.

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_off000c936f.bin
e326a58e50a05dd0af89a7bea45c9f71351608969571b8ca616aedd55f2cb7e1		 rtf-objdata-decoded RTF \objdata at offset 0xC936F 3739 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.