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

Static analysis result for SHA-256 5aa0d7817105bea2…

MALICIOUS

RTF

22.9 KB Created: 2020-01-08 08:54:00 First seen: 2022-05-13
MD5: 6f538874524c8da38fd1a93d3efe726a SHA-1: f4e370f582c44db13ef9f539074a591f88ca973d SHA-256: 5aa0d7817105bea29bf56ccf62db63e2217719d192e1f7f66ae55922fb4c3725
242 Risk Score

Malware Insights

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

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object that leverages the Equation Editor component, specifically triggering the CVE-2017-11882 vulnerability. This exploit is known to download and execute a secondary payload, as indicated by the ClamAV detection name 'Ole2.Exploit.ZxxZDownloader-9944376-0'. The embedded URL, though incomplete, further supports the payload delivery mechanism.

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
52dd17374c21ba8caade4ca285429fc99535f5d334d8ddf6e219894acf8a83e0		 rtf-objdata-decoded RTF \objdata at offset 0x118 6386 bytes

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