Malicious RTF — malware analysis report

Static analysis result for SHA-256 a6e1437600943be2…

MALICIOUS

RTF

45.0 KB Created: 2017-09-17 20:36:00 First seen: 2017-10-10
MD5: 0b0e2d9002a23be27ac1cfc711dab8a8 SHA-1: 0f44897d5ae463354210323ae405d1dea7208d4b SHA-256: a6e1437600943be25bd41a9df025deb2466c5338c00a8eb4938f187ceef98478
242 Risk Score

Malware Insights

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

The RTF file contains critical heuristic firings for CVE-2017-0199 and CVE-2017-8759, indicating exploitation of MSXML SAX OLE activation. The embedded URL http://www.baidu.com/free.doc is likely used to download a second-stage payload. The presence of OLE object data and an objupdate directive further supports the exploitation of embedded objects for malicious purposes.

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.
  • 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
  • \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 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://www.baidu.com/free.docIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002a94.bin rtf-objdata-decoded RTF \objdata at offset 0x2A94 4152 bytes
SHA-256: 6e5e99ede4e8bc6896380c13cce5660cbf3157c7d247567d0813221b2cd8af1c

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