Malicious RTF — malware analysis report

Static analysis result for SHA-256 6a3c0ec3e46cd083…

MALICIOUS

RTF

18.1 KB First seen: 2018-06-25
MD5: c4874638c1a5f1a626022346f657336e SHA-1: 58f8e15638d3d6d2025a742ba5b1771a06fdffca SHA-256: 6a3c0ec3e46cd0831c88c78e9584ef9b154c9d3458f6ae793935996180a64bb7
222 Risk Score

Malware Insights

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

The RTF document contains an OLE object that is automatically linked and updated, triggering an exploit for CVE-2017-0199. This exploit is designed to download and execute a second-stage payload, identified as an HTA file from the URL http://ddl7.data.hu/get/362472/11050192/jhgyvbgjf0.hta. The presence of the weaponized URL and the OLE object activation strongly indicate an exploit delivery mechanism.

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://ddl7.data.hu/get/362472/11050192/jhgyvbgjf0.hta In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000c4.bin rtf-objdata-decoded RTF \objdata at offset 0xC4 9147 bytes
SHA-256: 63f907cc4f142adf2256db78b7a7b6c960e42f611def4c298f85c84efa20335f

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