Malicious RTF — malware analysis report

Static analysis result for SHA-256 fb1f46152a84e08a…

MALICIOUS

RTF

9.3 KB Authoring application: Msftedit 5.41.21.2510 First seen: 2019-05-10
MD5: 5f27a727da0a82f824013b8d882d4178 SHA-1: 1d24e8adaefed976ac94a763e0d0e2b66b878763 SHA-256: fb1f46152a84e08ac6073e018106a78679014b08b140e30b73e7a51cf8bcd302
222 Risk Score

Malware Insights

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

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, specifically a .hta file, from the embedded URL http://149.28.133.71:8080/default.hta. The document body itself is a job application, likely serving as a lure to encourage the user to open the malicious attachment.

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://149.28.133.71:8080/default.hta In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001075.bin rtf-objdata-decoded RTF \objdata at offset 0x1075 2601 bytes
SHA-256: 00d6fecf03cda8badd682829ef273c07d9dd419424fc6b198eddaf892970fb75

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