Malicious RTF — malware analysis report

Static analysis result for SHA-256 0700286dda45eac6…

MALICIOUS

RTF

5.5 KB First seen: 2019-01-11
MD5: f373855f572b6d7c7a29ac31b59ae811 SHA-1: ba3800e954415602442b3b7df0e9779c120db511 SHA-256: 0700286dda45eac67f2c6521288390c380adda58b952026641e5ec651a72811d
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 configured to automatically update and activate an OLE object. This is leveraged to exploit CVE-2017-0199, which attempts to download a secondary document from the URL http://192.168.56.1/logo.doc. This exploit is a common method for delivering malicious payloads via seemingly benign documents.

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://192.168.56.1/logo.doc 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_off00000165.bin rtf-objdata-decoded RTF \objdata at offset 0x165 2601 bytes
SHA-256: c4bbf4cd5e0fef7949413a26bc5cab4a2c62e04af473df24a15ada3b5f07a7b7

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