Malicious RTF — malware analysis report

Static analysis result for SHA-256 7dd3757b2d710f97…

MALICIOUS

RTF

5.40 MB Authoring application: Msftedit 5.41.21.2510 First seen: 2018-03-04
MD5: 4946d2d35b2455efb0e3a9f75236cac2 SHA-1: 87cdd0c3b0be393cf465c058b69aa47b75112563 SHA-256: 7dd3757b2d710f97ebfaadbc298c56344cfb8f9189b0d11590a4caffe3b4cddb
262 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains OLE object data and exploits CVE-2017-0199, indicated by the 'CVE_2017_0199_WEAPONIZED_URL' heuristic. This exploit is designed to download and execute a payload from the URL http://118.70.80.143/getransomware.hta. The document body, written in Vietnamese, discusses ransomware and its methods of distribution, further supporting the malicious intent.

Heuristics 7

  • 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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~3571KB of hex-encoded data inside \objdata sections — may hide a payload
  • 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://118.70.80.143/getransomware.hta In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0056461d.bin rtf-objdata-decoded RTF \objdata at offset 0x56461D 2601 bytes
SHA-256: 4a29cbe2873884834671a7ac4c5583d62a41c20d2f0fcc58235540c67100fa55

Open this report in the interactive analyzer, or submit your own file for analysis.