Malicious RTF — malware analysis report

Static analysis result for SHA-256 4ea4b9a590007f99…

MALICIOUS

RTF

57.8 KB Created: 2018-02-17 08:44:00 First seen: 2018-07-14
MD5: 0d8a961e61b1a27ec13b987e2f464b71 SHA-1: 3a89ab9a4735b47f726fa3fb49bf4b36cb926aa1 SHA-256: 4ea4b9a590007f9944d62b34db74b0011f191c5e3f7be898c4aefe667124a819
282 Risk Score

Malware Insights

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

The RTF file contains critical vulnerabilities, specifically CVE-2017-0199, which is used to automatically link and activate an OLE object. This mechanism is designed to download and execute a secondary payload from the embedded URL http://goodel.ddns.net/a.rtf. The presence of OLE object data and automatic linking further supports the exploitation of these vulnerabilities for initial execution.

Heuristics 7

  • 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.
  • CVE-2017-0199 (OLE2Link / remote URL Moniker) critical CVE likely CVE_2017_0199
    RTF contains a URL Moniker OLE link whose decoded target is remote. Office can fetch and process the response through the CVE-2017-0199 OLE2Link attack path, but the server-side content type is not proven statically.
  • ClamAV: Rtf.Exploit.CVE_2017_0199-6335035-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_0199-6335035-0
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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 2 \objdata section(s) — embedded OLE objects
  • 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
    • http://goodel.ddns.net/a.rtfIn RTF body
    • http://goodel.ddns.net/b.rtfIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00004dfd.bin rtf-objdata-decoded RTF \objdata at offset 0x4DFD 3202 bytes
SHA-256: a5b8e01a6c7399c641184c46c216fea4dc366fac18500fe2ae090ba919875e01
objdata_01_off00006aeb.bin rtf-objdata-decoded RTF \objdata at offset 0x6AEB 3202 bytes
SHA-256: 5b0f75742a478fd6be3e407e85d2c16cfc387845f9c393879dedc449c06929c3

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