Malicious RTF — malware analysis report

Static analysis result for SHA-256 6ecf30b187a454a6…

MALICIOUS

RTF

3.59 MB Created: 2018-02-10 22:05:00 First seen: 2018-02-19
MD5: adb90c0b63791a80c2c74f98acbff162 SHA-1: a02b9201e028c7af3ab9d4a2d8c119ca9e913c85 SHA-256: 6ecf30b187a454a6a9771985b37fc1321ac40f78e60b630fdc3354eb33c80a1d
322 Risk Score

Malware Insights

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

The RTF file contains embedded OLE objects and exploits CVE-2017-0199, which is a known vulnerability for remote URL Moniker exploitation. The file attempts to download and execute a secondary RTF payload from the URL http://benfodil.ddns.net/a.rtf. The presence of excessive hex data within the OLE object suggests the hiding of a malicious payload.

Heuristics 8

  • 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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~3713KB of hex-encoded data inside \objdata sections — may hide a payload
  • 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://benfodil.ddns.net/a.rtfIn RTF body
    • http://benfodil.ddns.net/b.rtfIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0038def0.bin rtf-objdata-decoded RTF \objdata at offset 0x38DEF0 3202 bytes
SHA-256: 42e430fc5dbd98ecb7f731687e2e7e0b30599f310b9fbb3124d0b3c1199a7f4b
objdata_01_off0038fbeb.bin rtf-objdata-decoded RTF \objdata at offset 0x38FBEB 3202 bytes
SHA-256: c1781f386cb85287fe3a8ac592a4fce1768b477d4c144d99d487a9a3e068434e

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