Malicious RTF — malware analysis report

Static analysis result for SHA-256 0ed6a5907ba9c0e4…

MALICIOUS

RTF

5.9 KB Authoring application: Msftedit 5.41.21.2510 First seen: 2019-01-12
MD5: 6bd8f57e3c1d0740574456474ff756de SHA-1: 7d2ddd1135c0780198876b96ce2052dee4377846 SHA-256: 0ed6a5907ba9c0e49fab7ca0b477c7d53e01402a02bb7344799cf9fdf5e58e97
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, exploiting CVE-2017-0199. This vulnerability allows the document to download a secondary payload from the embedded URL http://www.freebuf.com/vuls/173794.html//. The file is detected by ClamAV as Rtf.Exploit.CVE_2017_0199-6335035-0, indicating a high likelihood of malicious intent.

Heuristics 6

  • 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
  • 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://www.freebuf.com/vuls/173794.html// In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000016e.bin rtf-objdata-decoded RTF \objdata at offset 0x16E 2784 bytes
SHA-256: d4633ed1f4ee1950d0424bdf1a9a863f236d33b889d37131947075e6aa67e038

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