Malicious RTF — malware analysis report

Static analysis result for SHA-256 b5274137d6105c2c…

MALICIOUS

RTF

5.6 KB Authoring application: Msftedit 5.41.21.2510 First seen: 2019-01-11
MD5: eb708792e88d61d02695e261464fd293 SHA-1: f8d66c3602a63adcc183627253d4803bd9b482d4 SHA-256: b5274137d6105c2c973d937ca935bfd7f5d61f2af41e8c15573ae8a78483e3b6
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 specified URL. The presence of the OLE object and the specific CVE firing strongly indicate a malicious intent to compromise the user's system.

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://142.93.45.121/8174cc.html In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000104.bin rtf-objdata-decoded RTF \objdata at offset 0x104 2724 bytes
SHA-256: 6294e0da174052b9d1640ff73ee67af82b1316dcaf3c8634c6798bc5af3e15c2

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