Malicious RTF — malware analysis report

Static analysis result for SHA-256 e881e5fe6f83c7d6…

MALICIOUS

RTF

5.6 KB First seen: 2017-12-24
MD5: 07ffc577433cf3f0de7a3f9e6568bc27 SHA-1: 79bd958990ebe85037256ae9f4060c7fd4ecd92c SHA-256: e881e5fe6f83c7d6f35e75227c086fed13ff3b6a874ac9253b89d7a759667ef9
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data that is automatically linked and updated, exploiting CVE-2017-0199. This vulnerability allows the file to download and execute a secondary payload from the specified URL, indicating a malicious downloader. The ClamAV detection further confirms the exploit.

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://103.238.227.39:80/test.php 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: 4e728d6420b5cbd03bfc50278014abac9335ee830547935672dc0cb5b5e220b0

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