Malicious RTF — malware analysis report

Static analysis result for SHA-256 f2163b4d02ba0ceb…

MALICIOUS

RTF

5.6 KB First seen: 2018-01-23
MD5: fe4eae66e9d564c63346076c33477c66 SHA-1: 4c2970747dedfbdfda7b4003294d7e24eb9b6b68 SHA-256: f2163b4d02ba0ceb7a582297e19da1d1e54ed7bc4f7ae03501300717f48ce0c6
222 Risk Score

Malware Insights

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

The RTF file contains OLE object data and is automatically linked, with an update forcing activation. This indicates exploitation of CVE-2017-0199, which is confirmed by heuristic firings and ClamAV detection. The embedded URL `http://bit.ly/2CznCGV` is likely used to download and execute 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://schemas.microsoft.com/office/word/2003/wordml In RTF body
    • http://bit.ly/2CznCGVIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000001ab.bin rtf-objdata-decoded RTF \objdata at offset 0x1AB 2601 bytes
SHA-256: d1ba9a895f22d18d705274a0feedd5a5b91289c5fac29bed5634c72f499a5f21

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