Malicious RTF — malware analysis report

Static analysis result for SHA-256 90ee24a8cdce55c9…

MALICIOUS

RTF

5.6 KB First seen: 2018-11-05
MD5: 827ef8b7095915ab65ba2519a2adf8e1 SHA-1: 464f8f3cfd12cb7d7db3f8fd540c6a5bcb4c2992 SHA-256: 90ee24a8cdce55c975f2031917abe6ef415999e974b6891b12b3f155029e0c7e
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an OLE object with an automatically linked and updating object, indicative of an exploit. Specifically, the CVE-2017-0199 exploit is detected, which leverages a weaponized URL to download and execute a secondary payload. The embedded URL http://192.168.1.11:80/resumer-php.hta is the target for this payload.

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://192.168.1.11:80/resumer-php.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: fef6a8a0aa6e4d7d4d67e8b662693da67ad2961d733552bbac5cfd78cf2566f6

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