Malicious RTF — malware analysis report

Static analysis result for SHA-256 3e652b6131822548…

MALICIOUS

RTF

52.7 KB Created: 2017-05-13 22:04:00 First seen: 2018-03-04
MD5: b0df2371aa7ff2524ce7524e50b97a7a SHA-1: 1ca8d3a3a8007500a7e5695e84b43a0299131b12 SHA-256: 3e652b613182254897cd17203e2f4e97977d0a54389b6a1c0eb32a9289b20cb1
282 Risk Score

Malware Insights

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

The RTF file exploits CVE-2017-0199, a known vulnerability in Microsoft Office that allows for remote code execution via OLE object activation. The embedded URL `http://foodforu.heliohost.org/blog/udel_calcel.php?fdid=U143Y0pIIiJUXjYmPltLMktIN19TOEZmUyM/Zj1eJl09XmFo` is used to download and execute a secondary payload. The presence of OLE object data and automatic linking further supports the exploitation of this vulnerability.

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://foodforu.heliohost.org/blog/udel_calcel.php?fdid=U143Y0pIIiJUXjYmPltLMktIN19TOEZmUyM/Zj1eJl09XmFo In RTF body
    • http://old.jrchina.com/btob_asiana/udel_calcel.php?fdid=123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890In 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_off00002910.bin rtf-objdata-decoded RTF \objdata at offset 0x2910 3625 bytes
SHA-256: 10daf2cc96b530e314907e6804d9e5b5eefd6e3b0fa119bbee88f268d7ba054b

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