Malicious RTF — malware analysis report

Static analysis result for SHA-256 1835acb6d9d38a92…

MALICIOUS

RTF

19.9 KB Created: 2017-10-12 14:09:00 Authoring application: LibreOffice/5.4.1.2.0$Linux_X86_64 LibreOffice_project/40m0$Build-2 First seen: 2017-11-13
MD5: 60533574ff7b66a48c8a94f36d9b67aa SHA-1: a4427243fc332e5f6cc27751b552c59d9bd41e80 SHA-256: 1835acb6d9d38a92c9b0c26d0e71951affd028d0040a5b49a4662fd8a5acdeb3
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains an OLE object that is automatically linked and updated, exploiting CVE-2017-0199. This exploit targets a vulnerability that allows for the execution of remote code. The embedded URL points to a HTA file, indicating the document's intent to download and execute a second-stage payload from the specified IP address.

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://192.168.1.49:8080/default.hta In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000039eb.bin rtf-objdata-decoded RTF \objdata at offset 0x39EB 2601 bytes
SHA-256: c8438df06379c6f9da8d96c0b53842cc690c641d10cbb444bc7142c40bb719c0

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