Malicious RTF — malware analysis report

Static analysis result for SHA-256 f1419cde4dd4e178…

MALICIOUS

RTF

52.7 KB Created: 2017-05-13 22:04:00 First seen: 2026-06-06
MD5: 67507ba3f892739ec3d87c6a6e3e0a65 SHA-1: 5f4789d644d026234ba177a3877a7419633202a9 SHA-256: f1419cde4dd4e1785d6ec6d33afb413e938f6aece2e8d55cf6328a9d2ac3c2d0
222 Risk Score
Tags
apt37

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, indicating an attempt to exploit vulnerabilities. Specifically, the heuristic firings and embedded URL point to CVE-2017-0199, which is used to download a payload from the URL http://old.jrchina.com/btob_asiana/udel_calcel.php?fdid=. This exploit allows for client-side execution of arbitrary code, likely leading to the download of a secondary malicious payload.

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://old.jrchina.com/btob_asiana/udel_calcel.php?fdid= In RTF body
    • http://old.jrchina.com/btob_asiana/udel_calcel.php?fdid=123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890In 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_off00002910.bin rtf-objdata-decoded RTF \objdata at offset 0x2910 3625 bytes
SHA-256: 4b9e0ddbf88c41753e65cc49a6d20aaeb2d2445c293459a112e63a82fdbfb600

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