Malicious RTF — malware analysis report

Static analysis result for SHA-256 5853ddfdeb61ad0c…

MALICIOUS

RTF

5.6 KB First seen: 2017-08-27
MD5: 2a0765ad3a7f0bec4add42bb7d170679 SHA-1: 174233b6ecf59b7953cff7b1c6a69e1134536588 SHA-256: 5853ddfdeb61ad0c95cb442729bf5a8acbee2a99fa54f4c276f05a96def8bb60
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data that is automatically linked and updated, indicating an attempt to exploit vulnerabilities. Specifically, the CVE-2017-0199 exploit is detected, targeting the remote URL http://192.168.8.108/logo.doc. This suggests the file is designed to download and execute a secondary payload from the specified address, likely as part of a phishing campaign.

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://192.168.8.108/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: e0280c4c8d562556b7beb53b15520e4831f8a930546d4858944742e2aa532d11

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