Malicious RTF — malware analysis report

Static analysis result for SHA-256 29e3fa4fa7b431a9…

MALICIOUS

RTF

39.6 KB Created: 2017-09-26 15:10:00 First seen: 2017-10-10
MD5: ea5385ff81218e861b06250ad8a749b2 SHA-1: 987b2feb0210c09708cf70b4e3b9bd36fd9f5cbb SHA-256: 29e3fa4fa7b431a910457e02d16b130c076c296249380797f2af8303da7c3ab3
222 Risk Score

Malware Insights

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

The RTF file contains an OLE object that is automatically linked and updated, triggering CVE-2017-0199. This exploit is designed to download and execute a remote resource, indicated by the embedded URL http://172.19.0.53:8080/exploit.txt, which likely serves as a secondary payload. The ClamAV detection further confirms the malicious nature of this exploit.

Heuristics 6

  • 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://172.19.0.53:8080/exploit.txt In RTF body
    • http://schemas.microsoft.com/office/word/2003/wIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000035c8.bin rtf-objdata-decoded RTF \objdata at offset 0x35C8 2724 bytes
SHA-256: 2de6f25a25186315a7d4d33fdfe3e93cc2361deebca4dd5fabc97d1c6d26a5d5

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