Malicious RTF — malware analysis report

Static analysis result for SHA-256 695f727eb40e66e9…

MALICIOUS

RTF

2.00 MB Created: 2018-03-04 14:26:00 First seen: 2019-08-04
MD5: 75b43e6dd244c6b3397fab837989e8fd SHA-1: 19f841a7ce0d947e701ca13fe81bda10c14a1876 SHA-256: 695f727eb40e66e976b78b54195c62d81cfd7a22d1d165dbd13c5fc0757a626b
542 Risk Score

Malware Insights

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

The RTF file contains multiple critical heuristic firings indicating exploitation of CVE-2017-11882 and CVE-2017-8759 through embedded OLE objects, specifically the Equation Editor. The presence of hex-encoded PE headers within OLE object data suggests the embedded objects are payloads. The document body's instruction to 'Enable editing' further supports a malicious intent to bypass security measures and execute code.

Heuristics 14

  • 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.
  • 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: 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
  • PE header (with DOS stub) in hex data critical RTF_MZ_HEX
    Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
  • \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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1923KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 4 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM
    RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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/wordm In RTF body

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002bdf.bin rtf-objdata-decoded RTF \objdata at offset 0x2BDF 961600 bytes
SHA-256: f977da5cd834e462c92012e88a2d151863621bf00481f3700c563ddee35bf8e0
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS, SC_STR_GETPROCADDRESS, SC_STR_LOADLIBRARY Static shellcode analysis recovered API/import strings: LoadLibraryA, GetProcAddress, kernel32.dll, KERNEL32.DLL, VirtualAlloc, VirtualProtect
objdata_01_off001f31d1.bin rtf-objdata-decoded RTF \objdata at offset 0x1F31D1 4183 bytes
SHA-256: 3382db8f6b736b12a349df724ee213f8b536038f5c7beb126a29c161b5ef93e5
objdata_02_off001f5499.bin rtf-objdata-decoded RTF \objdata at offset 0x1F5499 3826 bytes
SHA-256: 04f13a7b14f7c3e3d24e7b2d23b1bc798138fb3c2a319deb587dfde1eb9f06b1
objdata_03_off001fe5ed.bin rtf-objdata-decoded RTF \objdata at offset 0x1FE5ED 3546 bytes
SHA-256: 36fe84fb4e0a04625f538d5d0500c2c322c910f643bd6f8c46500ff5f6fe6bbc

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