Malicious RTF — malware analysis report

Static analysis result for SHA-256 e3ae26f01b2a5e9e…

MALICIOUS

RTF

5.6 KB First seen: 2017-12-24
MD5: bf11c47d8298749d20006234ac1f772c SHA-1: ba54c760316ab8d5a7e3248a5407777931fc4aa9 SHA-256: e3ae26f01b2a5e9e77571b0243181f925d9e81e30208f39eaecb0c5a414cc935
222 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data and is weaponized to exploit CVE-2017-0199. This exploit is designed to automatically link to and download a payload from the specified URL, which in this case is http://103.242.2.32/hello.hta. The file's primary function is to facilitate the execution of this remote script.

Heuristics 6

  • CVE-2017-0199 (OLE2Link / weaponized URL) critical CVE exact CVE_2017_0199_WEAPONIZED_URL
    RTF contains a URL Moniker OLE link to a script/HTA/template-style remote loader, matching the tighter static CVE-2017-0199 shape.
  • 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://103.242.2.32/hello.hta 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_off000001ab.bin rtf-objdata-decoded RTF \objdata at offset 0x1AB 2601 bytes
SHA-256: 54b092b320f8885437f612ccf9a996060205e722de5d00564e375e6b7a2e8fed

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