Malicious RTF — malware analysis report

Static analysis result for SHA-256 e3eea84c2271f5f8…

MALICIOUS

RTF

1.39 MB First seen: 2020-07-24
MD5: 630665678ec1781936458bbafce72b28 SHA-1: c54bb1f355b6d5374c24907318b4bfb7b002393a SHA-256: e3eea84c2271f5f8eff255d707552d765a8f25235b85303b8a395c81e0d70ead
242 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data and triggers heuristics related to Equation Editor, specifically CVE-2017-11882. This indicates an attempt to exploit a known vulnerability for client execution. The critical heuristic 'EXTRACTED_FILE_STATIC_TRIAGE' also flags suspicious shellcode-related artifacts, suggesting the embedded object is a payload designed to download further malicious content. No specific family could be identified.

Heuristics 7

  • Obfuscated Equation Editor ProgID + activation critical CVE related RTF_EQUATION_EDITOR
    RTF decodes to an Equation.3 ProgID from top-level \objdata hex after nested RTF junk groups are ignored, and the document also contains \objemb plus \objupdate activation. This is an obfuscated Equation Editor exploit surface associated with CVE-2017-11882 / CVE-2018-0802 families, but no exact malformed MTEF CVE primitive was recovered from this object.
  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • 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://bit.ly/2UBEvbV In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00163a08.bin rtf-objdata-decoded RTF \objdata at offset 0x163A08 1456 bytes
SHA-256: 40051ba809fdc93256a9135b9dba6093b5581be9663a32898a1829b4f29e7987
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://bit.ly/2UBEvbV Static shellcode analysis found candidate code region(s). Indicators: SC_STR_LOADLIBRARY, SC_STR_URLDOWNLOAD, SC_PEB_ACCESS Static shellcode analysis recovered API/import strings: LoadLibraryA, GetProcAddress, CreateProcessA, URLDownloadToFileA, ExitProcess

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