Malicious RTF — malware analysis report

Static analysis result for SHA-256 ca9b8c1421186ea0…

MALICIOUS

RTF

41.4 KB Created: 2018-02-13 16:05:00 First seen: 2018-02-19
MD5: add1eefb52b2609372891085bafefb21 SHA-1: 75fdccef1a2cb9d771d87c125339fa7d71214745 SHA-256: ca9b8c1421186ea0c6b16f200e5f1aefae8030d3c3951e774927cbf4588c763b
182 Risk Score

Malware Insights

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

The RTF file contains an OLE object that leverages CVE-2017-0199 to fetch a remote document from http://localhost/doc.rtf. This technique is commonly used to deliver malicious payloads. The presence of the OLE object and the specific CVE exploit strongly indicate a malicious intent to execute arbitrary code.

Heuristics 5

  • 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.
  • 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://localhost/doc.rtf 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_off00002979.bin rtf-objdata-decoded RTF \objdata at offset 0x2979 2601 bytes
SHA-256: 13f1efc3f14faafb554f67fc922699fbd2e1a7aaac43da1d693b1ece2d04ee25

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