Malicious RTF — malware analysis report

Static analysis result for SHA-256 2cefd5083c60a7a0…

MALICIOUS

RTF

5.6 KB First seen: 2017-11-29
MD5: 308e89ae127afd50ccf322746358e567 SHA-1: 6b28955e6f9fd8fd33896a27712386efeeaddc91 SHA-256: 2cefd5083c60a7a0fec556e6dbda3a4514311537f5df6ab7b13b46da80567ace
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 and is weaponized with a URL exploiting CVE-2017-0199. This vulnerability allows the file to automatically link and update an OLE object, which in this case is configured to download and execute a secondary payload from the specified HTTP address. The ClamAV detection further confirms the malicious nature of this exploit.

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://192.168.0.11:8080/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: 2b7d72249b20813a91aa3831369e93451600da3a56a6a69778072260a4066a73

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