Malicious RTF — malware analysis report

Static analysis result for SHA-256 17b98611ab7cae50…

MALICIOUS

RTF

42.2 KB Created: 2018-07-09 17:40:00 First seen: 2019-04-18
MD5: 4cf13dd521ca5e65758bccf514995ffb SHA-1: 87d6587b2f5ce433c33b7cb58d5876f6843a7ad0 SHA-256: 17b98611ab7cae50de2b8ffa844ee89f9dad991ae9ba7f2daace4045ae3f5318
282 Risk Score

Malware Insights

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

The RTF file contains critical heuristics indicating exploitation of CVE-2017-0199 and CVE-2017-8759. It attempts to download a secondary document from the URL http://141.255.150.121/documento.doc, which is likely a malicious payload. The presence of OLE object data and automatic linking further supports the exploitation of these vulnerabilities for client 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 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://141.255.150.121/documento.doc 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_off00002a80.bin rtf-objdata-decoded RTF \objdata at offset 0x2A80 2601 bytes
SHA-256: 21d0e94416f3bce9303ae9285cc464295da3cda06533871a7a4861953b32d8b3

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