Malicious RTF — malware analysis report

Static analysis result for SHA-256 3189e8febf7e7243…

MALICIOUS

RTF

43.8 KB Created: 2017-08-23 01:31:00 First seen: 2017-08-27
MD5: 638fb4b4857d64f44633a432fc980b87 SHA-1: e9c9696eaaa8e3af0833827ecf3ffba342c7842d SHA-256: 3189e8febf7e72436e910c738f3eeecbabf21675ccc109726365275380ba96a0
142 Risk Score

Malware Insights

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

The RTF file contains an OLE object and triggers critical heuristics for CVE-2017-0199, indicating exploitation of a remote URL moniker. The embedded URL points to baidu.com, which is likely used to download and execute a secondary payload. The file is classified as malicious due to this exploit.

Heuristics 4

  • 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
  • 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://schemas.microsoft.com/office/word/2003/wordml In RTF body
    • https://www.baidu.com/In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002ad7.bin rtf-objdata-decoded RTF \objdata at offset 0x2AD7 3924 bytes
SHA-256: 88b1e294beec0fad6104879323024ba3be5c98f2eec6a552302ed6cb1e24d449

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