Malicious RTF — malware analysis report

Static analysis result for SHA-256 54dbf75a8d1855e7…

MALICIOUS

RTF

261.1 KB Created: 2018-07-03 09:28:00 First seen: 2020-02-04
MD5: 92b1f6dbed262cd7c5d2d08d1dc47973 SHA-1: 31a5ad63ae49f2060738c75ca0d13b92b3235ec2 SHA-256: 54dbf75a8d1855e7391b3cd0a561a0775bfcfe11f212c46c8ef3cdead7687fd0
262 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains embedded OLE objects and triggers critical heuristics for CVE-2017-11882 (Equation Editor FONT record overflow) and CVE-2017-8759 (MSXML SAX OLE activation). These exploits are used to execute a malicious MSI installer downloaded from the URL http://thecoverstudio.com/modules/jmsslider/views/img/layers/app/upjnyh.msi. The file is classified as malicious by ClamAV due to the CVE-2017-11882 exploit.

Heuristics 7

  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • 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.
  • ClamAV: Doc.Exploit.Cve_2017_11882-7570663-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.Cve_2017_11882-7570663-1
  • \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://thecoverstudio.com/modules/jmsslider/views/img/layers/app/upjnyh.msi In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000bf6b.bin rtf-objdata-decoded RTF \objdata at offset 0xBF6B 15672 bytes
SHA-256: 39bc9744c34f0bb6a2739253d45f6eb476987fd60eb4f834028b928e1673920a

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