Malicious RTF — malware analysis report

Static analysis result for SHA-256 348973d565c6b755…

MALICIOUS

RTF

5.6 KB First seen: 2019-05-31
MD5: b7d41cfbca96b58d0cf9f1e1cb6b8699 SHA-1: b3e6d17dad4bb39afe0a29b19a20356ba726cfa5 SHA-256: 348973d565c6b755ee8b9d9cbafd69ed6180709d92e375a2e20692e7b410205b
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 file, indicated by the embedded URL http://192.168.1.1:8080/192.168.1.1/download/test.ext. The file's structure and the critical heuristic firings strongly suggest it acts as a dropper for further malicious content.

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://192.168.1.1:8080/192.168.1.1/download/test.ext 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_off000001b4.bin rtf-objdata-decoded RTF \objdata at offset 0x1B4 2601 bytes
SHA-256: a111d179d99817afabd442bab17b41265d38eb3e3ac95f7c5fd66baede633624

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