Malicious RTF — malware analysis report

Static analysis result for SHA-256 1b988660549a69d3…

MALICIOUS

RTF

215.4 KB Created: 2017-04-27 07:57:00 First seen: 2017-08-08
MD5: ce0620a21b0ae4c5a527c5379b9d6664 SHA-1: 3d965790ac2c7a836b52051f0d752b48ac175356 SHA-256: 1b988660549a69d34a6be16f28357a1b899b26e65305fc4b46daf25f28ffd56f
282 Risk Score

Malware Insights

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

The RTF document exploits CVE-2017-0199, a known vulnerability in Microsoft Office that allows for remote code execution via OLE object activation. The embedded URL 'http://samiltech.com/admin/data/bbs/bbs_in.php' is highly suspicious and likely serves as the source for a secondary payload. The document body content appears to be unrelated news about North Korea, suggesting it is a lure.

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 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://samiltech.com/admin/data/bbs/bbs_in.php 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_off0002c72b.bin rtf-objdata-decoded RTF \objdata at offset 0x2C72B 2601 bytes
SHA-256: 1f9e552ea231ba55b98502e51e2fa2d847b21cd135e88c81e2f48fc3f3f6b19b

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