Ole2.Exploit.ZxxZDownloader — RTF / .DOC malware analysis

Static analysis result for SHA-256 6b475078aca28ef7…

MALICIOUS

RTF / .DOC

35.6 KB Created: 2020-01-08 08:54:00 First seen: 2022-05-13
MD5: 09161b193fcc97e56ab87a03f9e44e44 SHA-1: 74072a2a6c09e29ea412a2095e34bc48a812bbc1 SHA-256: 6b475078aca28ef7c8b162065b562e61670aceea1602715f53d64d81e7023a2a
242 Risk Score

Malware Insights

Ole2.Exploit.ZxxZDownloader · confidence 95%

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

The RTF file contains embedded OLE object data, specifically triggering the CVE-2017-11882 vulnerability related to Equation Editor. This exploit is known to facilitate the execution of arbitrary code, typically used to download and run a secondary malicious payload. The ClamAV detection name 'Ole2.Exploit.ZxxZDownloader' further supports this analysis.

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 2 \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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000118.bin
fffceb65fe5231315d6fc98b3d2aab3fc7d29b3c9b70330a82b3a7406d4cd6c9		 rtf-objdata-decoded RTF \objdata at offset 0x118 6386 bytes
objdata_01_off000033c1.bin
4202da43a55489cf253edd553bad1cd1c88fa7a4ebb9bbb49b1a09e58f03cb00		 rtf-objdata-decoded RTF \objdata at offset 0x33C1 6386 bytes

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