Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 21b4d82fafbaeb8b…

MALICIOUS

RTF / .DOC

10.6 KB Authoring application: Riched20 6.3.9600
MD5: 583759b841c9029be63fb1f81cdfb443 SHA-1: eaf476e635a5f2eaae402cf941fb1e847be1ef6a SHA-256: 21b4d82fafbaeb8b0b9ba45ccfc7538986528cd9c279425fa4cbf15e8dc0fefa
322 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object that exploits CVE-2017-11882 through a FONT record overflow in the Equation Editor. This exploit is designed to download and execute a second-stage payload from the URL https://webooplc.xyz/iturkkhzxglzjatpuxjbgylqzvepsbpjwu.msi. The presence of multiple critical heuristics related to Equation Editor and CVE-2017-11882 strongly indicates this attack vector.

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.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • Equation Editor object class critical RTF_OBJCLASS_EQUATION
    Object class 'equation.3' references Equation Editor
  • ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
  • \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 https://webooplc.xyz/iturkkhzxglzjatpuxjbgylqzvepsbpjwu.msi

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000361.bin
05824f4b196e9379c13f3fe04a20cff75c9e4de1f86ad6d4e1b24430d162518f		 rtf-objdata-decoded RTF \objdata at offset 0x361 3546 bytes

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