Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 0bf7a865e364d610…

MALICIOUS

RTF / .DOC

10.6 KB Authoring application: Riched20 6.3.9600 First seen: 2022-08-22
MD5: c09800b7c7c7dd860f949d1ea2368402 SHA-1: 2a5831b5bcb15b48a022c5770b17882852cca803 SHA-256: 0bf7a865e364d6108c92ca7d048a8159a918ec4a8d20820bca7cef87b4b2dc82
322 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1059.003 Command and Scripting Interpreter: Windows Command Shell T1566 Phishing T1566.001 Phishing: 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 secondary payload from the URL https://lapauseconnexion.com/pp.exe, indicating a downloader or dropper functionality.

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://lapauseconnexion.com/pp.exe

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000369.bin
e28a365ad590b6bb0ed402f8889a933f577b1546a580cfa45c2cfbe13aacd20e		 rtf-objdata-decoded RTF \objdata at offset 0x369 3546 bytes

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