Malicious RTF — malware analysis report

Static analysis result for SHA-256 0299a257decf055c…

MALICIOUS

RTF

31.2 KB First seen: 2023-01-18
MD5: 767eb721967d5ac8cc89044e0e5b3639 SHA-1: e90c6802c5a88682f5965dbf902c37fa0eff8f64 SHA-256: 0299a257decf055c998f326ab2f352bec03d5d3b0e1aaed438c4c06e9c4f31b5
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object specifically identified as related to CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. The presence of \objdata and \objupdate directives strongly suggests an attempt to trigger the vulnerability upon opening the document, likely to download and execute a secondary payload. The document body contains a lure to 'Enable editing', further supporting the malicious intent.

Heuristics 6

  • 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.
  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • \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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00005eb2.bin
97ee391eacce70b56601385bb968119c5625d27dcdedff85ac001b113ded723b		 rtf-objdata-decoded RTF \objdata at offset 0x5EB2 1695 bytes

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