Malicious RTF — malware analysis report

Static analysis result for SHA-256 31de9fe8c968002a…

MALICIOUS

RTF

5.6 KB First seen: 2017-11-20
MD5: 83e60e7d6a828f62c20f7a1f9dd9b867 SHA-1: bbcf07a04ccb5116260c9cb1bc66382182395ac3 SHA-256: 31de9fe8c968002a0bd7d6915c325750323bd68722088ba170ad912e5c2bf247
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 embedded OLE object. This is leveraged to exploit CVE-2017-0199, which is designed to download and execute a remote file. The targeted URL, http://192.168.0.2/raj.doc, is highly suspicious and likely serves as the secondary payload.

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://192.168.0.2/raj.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: 45009f673bfd903e889223ea48f7cc2745f76058f71488e67f8d1a9fb2cfb228

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