Malicious RTF — malware analysis report

Static analysis result for SHA-256 caaa963368efbdfc…

MALICIOUS

RTF

5.6 KB First seen: 2017-10-28
MD5: 949de0b69ff32f5f3506d9fc17490064 SHA-1: 92138eaec7137d8c76134bc61494307cf85d6da4 SHA-256: caaa963368efbdfca84c4d737d6e62f9f8e8d1ce503e107fc45b3209ed9c8815
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 exploits CVE-2017-0199, indicated by the 'CVE_2017_0199_WEAPONIZED_URL' heuristic. This exploit is designed to automatically link to and update an object from a remote URL, which in this case is http://192.168.1.182:8080/default.hta. This URL likely hosts a secondary payload that will be downloaded and executed on the victim's machine.

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://192.168.1.182:8080/default.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_off000001b4.bin rtf-objdata-decoded RTF \objdata at offset 0x1B4 2601 bytes
SHA-256: 02c793abe2e0eed0d4b92f9c3fd5790198a3e16055b1394ac1e502f1439fd9c6

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