Malicious RTF — malware analysis report

Static analysis result for SHA-256 e8cd9021b5cbeec6…

MALICIOUS

RTF

5.6 KB First seen: 2019-03-18
MD5: 43cccc87f408f265fca77091a8c4f07a SHA-1: e2ab2e64cf34b1156db7021843ad400f470b3cd1 SHA-256: e8cd9021b5cbeec699777a9e17d00c01760ad02b3cc0da39f7f713046b7c1c08
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 automatically linked and updated, indicating an exploit attempt. Specifically, it leverages CVE-2017-0199 to contact the URL http://192.168.0.100:8080/default.hta, which likely serves as a dropper for a secondary payload. This exploit is commonly delivered via spearphishing attachments.

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://192.168.0.100:8080/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: a3e674d766b06233ff02091043e4f0d2a8b33f157b9390d00abec23fcfaed6cc

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