Malicious RTF — malware analysis report

Static analysis result for SHA-256 6b8c87b86bf09551…

MALICIOUS

RTF

5.6 KB First seen: 2019-06-27
MD5: d6e147c5dcebb14d930b8a6849c7b7fa SHA-1: b22b997af8e6ba2752ee2ecfb051a8c2228c3f87 SHA-256: 6b8c87b86bf095514d5df609732f8ef15ed957eda49e3711f65ec3af7a0166f1
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, indicating an attempt to activate remote content. The critical heuristic firing for CVE-2017-0199 confirms the exploitation of this vulnerability to fetch a remote document from http://192.168.1.4/logo.doc, which is likely a secondary payload. This exploit is commonly used in spearphishing campaigns.

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://192.168.1.4/logo.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: 874637a32492a2ee014d906a19c92c59b1f96e33a5e8a9d5e62ef39728d8fdd9

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