Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 f65448795d82b5fa…

MALICIOUS

RTF / .DOC

10.6 KB Authoring application: Riched20 6.3.9600 First seen: 2022-03-03
MD5: 1ede24bf9dcea71f2a613aec26ce7608 SHA-1: 15984cf6bb70c75f1a9b2412bd4fe09eb4241639 SHA-256: f65448795d82b5fae1daf20fb86aff7949efd5e155675568762474ac8c64285d
322 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1559.002 Component Object Model T1059.003 Windows Command Shell

The sample is an RTF document containing an embedded OLE object that exploits CVE-2017-11882. This vulnerability is triggered by the Equation Editor component, leading to the execution of arbitrary code. The embedded URL suggests a download of a second-stage payload, likely an MSI installer, which is a common delivery mechanism for malware.

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 http://179.43.175.171/bqlv/newlist.msi

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000361.bin
ec357b51948462cfbe576c280e1ef7a2161b5fa14c5b23b7ae30331f38ea5390		 rtf-objdata-decoded RTF \objdata at offset 0x361 3546 bytes

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