Malicious RTF — malware analysis report

Static analysis result for SHA-256 8d82ae30d99ff3d4…

MALICIOUS

RTF

5.6 KB First seen: 2017-12-24
MD5: 0bdb092ad91efbf0d73ba8f5c2cb45f1 SHA-1: 7a8cccd6825e653a0728e23c84442bd9eb11e9bf SHA-256: 8d82ae30d99ff3d4b871dcc08c5b80f92cca077f1c64f51c7253a891a968d84b
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains an OLE object that is automatically linked and updated, exploiting CVE-2017-0199. This exploit is designed to download and execute a secondary payload from the embedded URL http://192.168.126.135:80/default.hta, which is likely to be malicious. The ClamAV signature further confirms the exploit's malicious nature.

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://192.168.126.135:80/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: fe9ea490a716c9b6c82e344aba02e267f2404591c4cb1d12f09387395ec5d1bd

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