Malicious RTF — malware analysis report

Static analysis result for SHA-256 8503f67a0a4b6e00…

MALICIOUS

RTF

54.2 KB Created: 2018-08-02 18:50:00 First seen: 2019-01-11
MD5: 1450239434eb8244e8239f916f525f37 SHA-1: d933e113c8c891ddd613338ec6ab094e96b53c6d SHA-256: 8503f67a0a4b6e008a5c5a4c825a0c9514030f3cd2e9879be06ac761949e0d56
342 Risk Score

Malware Insights

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

The RTF file contains embedded OLE objects and specifically triggers critical heuristics related to Equation Editor and CVE-2017-11882. This indicates the file is designed to exploit this known vulnerability for client-side code execution. The presence of shellcode candidate regions further supports this. The file is likely delivered as a spearphishing attachment.

Heuristics 9

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • 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.
  • ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
  • Equation Editor object class critical RTF_OBJCLASS_EQUATION
    Object class 'equation.3' references Equation Editor
  • \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 2 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Suspicious extracted artifact medium 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.
  • 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://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00009749.bin rtf-objdata-decoded RTF \objdata at offset 0x9749 3546 bytes
SHA-256: 2e1cea19afd53ee33aeccedad3b1240fa7c8c6e62b9d7bde3efdceafa9de8874
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS
objdata_01_off0000b820.bin rtf-objdata-decoded RTF \objdata at offset 0xB820 3546 bytes
SHA-256: f91b605736218959a4a12e02ab1ef5fa2f5b9aaaa50069e71ebeafbb6ed48b39

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