Malicious RTF — malware analysis report

Static analysis result for SHA-256 4efee65d09812a4d…

MALICIOUS

RTF

5.6 KB First seen: 2017-11-13
MD5: a41e57e266cab5f564db6c4316ebf22a SHA-1: f3942b182541f1b41a748893cf08d9e06023ed2a SHA-256: 4efee65d09812a4dd87e3273b50a73d83a34cce96d93df2f92f36f90052ae86d
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 configured to automatically update from a remote URL, exploiting CVE-2017-0199. This technique is commonly used to download and execute a second-stage payload, in this case, an HTA file hosted at http://192.168.0.108:80/default.hta. The presence of the weaponized URL and OLE object strongly indicates a malicious intent to execute arbitrary code.

Heuristics 6

  • CVE-2017-0199 (OLE2Link / weaponized URL) critical CVE exact CVE_2017_0199_WEAPONIZED_URL
    RTF contains a URL Moniker OLE link to a script/HTA/template-style remote loader, matching the tighter static CVE-2017-0199 shape.
  • 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://192.168.0.108:80/default.hta 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_off000001b4.bin rtf-objdata-decoded RTF \objdata at offset 0x1B4 2601 bytes
SHA-256: 0462203862b65d5cc0515a56f0dd4990b8aea01227d153587910eb89259fe1a1

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