Malicious RTF — malware analysis report

Static analysis result for SHA-256 aa3d64adf6b619b8…

MALICIOUS

RTF

5.6 KB First seen: 2017-09-14
MD5: 0503e17d080ffb59975a1561ec811b32 SHA-1: dc9d2f9513c9f3862adc32c692858781ade786c0 SHA-256: aa3d64adf6b619b8d549c644926ecba3167be4c607bf6a80f19d5d6b8cf41451
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, indicating an attempt to exploit vulnerabilities. Specifically, the CVE-2017-0199 heuristic fired, pointing to a remote URL that likely serves a secondary malicious payload. This exploit is commonly used in spearphishing attachments to achieve initial execution.

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://45.55.195.44/cve.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_off000001a2.bin rtf-objdata-decoded RTF \objdata at offset 0x1A2 2601 bytes
SHA-256: e34cb1708a960abbe8865fb56f326c0d16baaf09cf6fde39cc22c5d34f1be227

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