Malicious RTF — malware analysis report

Static analysis result for SHA-256 568233f85722eac7…

MALICIOUS

RTF

448.3 KB Created: 2020-03-18 05:38:00 First seen: 2020-05-25
MD5: 907e0fac39594bdcb059f67579168995 SHA-1: fa235beb5578ea59c709c85655f22acd7775e724 SHA-256: 568233f85722eac761a808fc6f84f65a9c32453a9339a736895a6ad7ed5291fc
182 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object associated with Equation Editor, triggering heuristics for CVE-2017-11882. This indicates the file is designed to exploit this vulnerability for client-side code execution. The presence of multiple OLE object data sections and the ".objupdate" directive further support the exploitation attempt. No specific malware family could be identified.

Heuristics 6

  • Equation Editor CLSID critical CVE likely 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 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.
  • \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.com/office/word/2003/wordml In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000374f.bin rtf-objdata-decoded RTF \objdata at offset 0x374F 3346 bytes
SHA-256: cb74e44f9cf6b4be8d51ce743833214b8e7b5951751e311bd4de33f495374ba6
objdata_01_off0000ce21.bin rtf-objdata-decoded RTF \objdata at offset 0xCE21 114294 bytes
SHA-256: 3bcfd63a832ad78fb39121281b2222619606026c52dfc409915a9cc35bd100b5

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