Ole2.Exploit.ZxxZDownloader-9944376-0 — RTF / .DOC malware analysis

Static analysis result for SHA-256 9a8b201eb2bebe30…

MALICIOUS

RTF / .DOC

22.9 KB Created: 2020-01-08 08:54:00 First seen: 2022-05-13
MD5: bf1a905e11f4d44de8bd2e0a6f383ed5 SHA-1: a07b22ac47f0e304ae2bbc070de371dd78e9daa2 SHA-256: 9a8b201eb2bebe309d15c7b0ab5a6dcde460b84b035bb3575d4a0ec6af51a37e
242 Risk Score

Malware Insights

Ole2.Exploit.ZxxZDownloader-9944376-0 · confidence 95%

MITRE ATT&CK
T1204.002 Malicious File

The file is an RTF document containing an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for the execution of arbitrary code, which in this case is used to download and execute a second-stage payload, as indicated by the ClamAV detection name 'Ole2.Exploit.ZxxZDownloader-9944376-0'. The presence of RTF_OBJDATA, RTF_OBJEMB, RTF_EQUATION_EDITOR, and RTF_OBJUPDATE heuristics strongly supports this attack pattern.

Heuristics 7

  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • 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
  • ClamAV: Ole2.Exploit.ZxxZDownloader-9944376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Ole2.Exploit.ZxxZDownloader-9944376-0
  • \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://schemas.microsoft.c

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000118.bin
b1333dacaa11ecc6dfd6f46549a8f01fd032f7984eefbb55f0a3f793e9c8ad9c		 rtf-objdata-decoded RTF \objdata at offset 0x118 6386 bytes

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