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

Static analysis result for SHA-256 b0b687977eee41ee…

MALICIOUS

RTF / .DOC

22.9 KB Created: 2020-01-08 08:54:00 First seen: 2022-05-13
MD5: bdbbd70229591fb1102365f4bb22196b SHA-1: b12e459dd3857f5379ac99e48def4ad2b8a3aa16 SHA-256: b0b687977eee41ee7c3ed0d9d179e8c00181f0c0db64eebc0005a5c6325e8a82
242 Risk Score

Malware Insights

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

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File T1559.001 Component Object Model Hijacking: Component Object Model T1059.001 Command and Scripting Interpreter: PowerShell

The file is an RTF document that leverages the CVE-2017-11882 vulnerability within the Equation Editor component. This exploit is designed to embed and execute malicious code, likely a downloader as indicated by the ClamAV detection name 'Ole2.Exploit.ZxxZDownloader-9944376-0'. The presence of OLE object data and explicit triggers for OLE activation ( objupdate) strongly suggest the exploitation of this vulnerability. The embedded URL, though reputedly unknown, is a potential indicator of the download source.

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

Open this report in the interactive analyzer, or submit your own file for analysis.