Malicious RTF — malware analysis report

Static analysis result for SHA-256 def1352fef771b6c…

MALICIOUS

RTF

5.6 KB First seen: 2020-02-04
MD5: e430e4799ee8fb0b0cf2d7be9ded6668 SHA-1: a079de668ba0b18129420310751980057a6da7ec SHA-256: def1352fef771b6ce3272d842123719c544481604fbf7eb0103986b8d605d149
222 Risk Score

Malware Insights

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

The RTF file contains an OLE object with an automatically linked and updated object, indicative of exploitation. Specifically, the CVE-2017-0199 vulnerability is leveraged to fetch and execute a payload from the URL http://192.168.80.100:8080/default.hta. This exploit allows for client-side execution of arbitrary code, likely to download and run a further stage of malware.

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://192.168.80.100:8080/default.hta 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: 7bf9a9fbb88c6c110afbc81c9c177861574571d3d5c3eae1c3be028889ac2d12

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