Malicious RTF — malware analysis report

Static analysis result for SHA-256 ae1030e347d4b006…

MALICIOUS

RTF

5.6 KB First seen: 2017-12-24
MD5: 069d2f3d58c5792a9d62c7e123e97e9c SHA-1: 1d2a3489e01e7c9d2919cc615f3c36adc48db302 SHA-256: ae1030e347d4b006f327d8c05177c34b53c3fb9235a66797bc323b5fa83011af
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, indicating an attempt to exploit CVE-2017-0199. This exploit is used to download and execute a secondary payload, specifically a .hta file, from the URL http://66.66.66.66:8080/default.hta. The presence of the weaponized URL and the OLE object activation heuristics strongly suggest this exploit vector.

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://66.66.66.66:8080/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: db3ceb8bd13b16ea25349dcd6b4110400103b990fd1de82a069b33b1ae6a38bf

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