Malicious RTF — malware analysis report

Static analysis result for SHA-256 42cfe2ce496d8983…

MALICIOUS

RTF

39.6 KB Created: 2017-09-27 18:14:00 First seen: 2017-10-10
MD5: 14e64e337825d488a46c422aecc56aa6 SHA-1: 0e73a9f2edc74683e9f968e846562d37a0525a00 SHA-256: 42cfe2ce496d8983606d824839489e1213b406e358ae6c51cbeeef079ff7dfc4
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, triggering CVE-2017-0199. This exploit is designed to download and execute a remote payload from the URL http://172.19.0.52:8080/exploit.txt, indicating a likely initial access vector via spearphishing attachment.

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://172.19.0.52:8080/exploit.txt 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_off000035b9.bin rtf-objdata-decoded RTF \objdata at offset 0x35B9 2724 bytes
SHA-256: 5d6649837101bcaf89cddddfd164730e52f788c5b7d286e0b48e836483c31d3f

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