Malicious RTF — malware analysis report

Static analysis result for SHA-256 887043cb38d6a299…

MALICIOUS

RTF

2.00 MB Created: 2019-09-17 13:59:00 First seen: 2020-05-25
MD5: d8ba4e9cdcbe8711c0a1c73d2aa8b077 SHA-1: e8e1a9cb5a6dd587a7cd327b94779f0c38f6aa62 SHA-256: 887043cb38d6a299ab46f4f50e31477ad934ec0496d3963d1ba35c254d665006
142 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 an update via \objupdate, indicating an attempt to exploit vulnerabilities. The critical heuristic firing for CVE-2017-8759 confirms the exploitation of this specific vulnerability for OLE activation. This suggests the document is designed to execute arbitrary code upon opening, likely to download and run a secondary payload.

Heuristics 5

  • 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.
  • \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 In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off001f094b.bin rtf-objdata-decoded RTF \objdata at offset 0x1F094B 1413 bytes
SHA-256: f9694406066287aad2debaa3a26967fb4e2fd33460c3bacf315b74b6736dda5f

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