Malicious RTF — malware analysis report

Static analysis result for SHA-256 e9ee113541b435aa…

MALICIOUS

RTF

58.4 KB Created: 2017-07-25 12:25:00 First seen: 2018-03-04
MD5: f208d29a47d744706ee707cc824bac04 SHA-1: 20f715a836ad8ee10d88805534c19f6db731d995 SHA-256: e9ee113541b435aab140ed3994c942fa0cf790f81e1c9ba05fa4dee760347ca7
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 exploits CVE-2017-0199, a known vulnerability for remote code execution. The heuristic firings and extracted URL indicate that the file attempts to download and execute a secondary payload from the IP address 159.8.24.196. This is a common technique for delivering further malware stages.

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://schemas.mi In RTF body
    • http://159.8.24.196:8086/In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002e29.bin rtf-objdata-decoded RTF \objdata at offset 0x2E29 2601 bytes
SHA-256: 67aa96f1582a44128aa79d84ef49350e7cb2d171ad96e19f0788a79e0e8c2a9d

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