Malicious RTF — malware analysis report

Static analysis result for SHA-256 9d00f8b664dd46da…

MALICIOUS

RTF

41.4 KB Created: 2018-02-13 16:05:00 First seen: 2018-02-19
MD5: 3cf89acb79fe7344ca86fbc5ae0a2f94 SHA-1: e55e847edd5f3eeeffac648bfb811cdf9b58db51 SHA-256: 9d00f8b664dd46dad1ab689d06b34cd9f68c4fa076556d7e1b0d37bcea1b2c3b
222 Risk Score

Malware Insights

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

The RTF file contains an OLE object that is automatically linked and updated, exploiting CVE-2017-0199. This exploit is designed to download and execute a remote RTF document from a specified URL. The embedded URL 'http://localhost/doc.rtf' is the primary indicator of the malicious payload's origin.

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://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_off00002983.bin rtf-objdata-decoded RTF \objdata at offset 0x2983 2601 bytes
SHA-256: 13f1efc3f14faafb554f67fc922699fbd2e1a7aaac43da1d693b1ece2d04ee25

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