Malicious RTF — malware analysis report

Static analysis result for SHA-256 1569ef8126ff7498…

MALICIOUS

RTF

5.6 KB First seen: 2019-05-16
MD5: 991110b3fbbdbd70bb0ff41c91b0b629 SHA-1: fd126d17a314db946bab229cc8ac3cef90235d4b SHA-256: 1569ef8126ff74989fab16a291927079973cd18712902d19697c466c51b724a6
222 Risk Score

Malware Insights

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

The RTF file contains heuristics indicating the exploitation of CVE-2017-0199 via an embedded OLE object. This object is configured to automatically link and update, which is a common technique for downloading and executing a second-stage payload. The embedded URL http://185.20.186.17:8080/default.hta is highly suspicious and likely hosts this payload.

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://185.20.186.17:8080/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: d388abb816f5cb38f2387fc41a25a89ce93b7d3d06bb6a15b83efb17654c99b2

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