Malicious RTF — malware analysis report

Static analysis result for SHA-256 05ff72a309e2bf15…

MALICIOUS

RTF

5.6 KB First seen: 2019-01-12
MD5: 21a2dbeecf61701ba4bf1a53df7ee199 SHA-1: 180c28b3e745057687e6f4c1736e3e61e2532ac2 SHA-256: 05ff72a309e2bf1573573cf7d4a46b2c610316d024841784a80a136e303f1dce
222 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data and is configured to automatically link and update an OLE object. This behavior is indicative of an exploit targeting CVE-2017-0199, which is confirmed by the presence of the target URL. The exploit likely downloads and executes a second-stage payload from the specified remote URL.

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://192.168.237.131:8080/cve-2017-0199 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: ef68edc06ad47129377aee133ec728b8059a75ceda5b0432e7dbd0b65d02474b

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