RTF malware analysis — malicious · 7238f4e5edbe0e5a

MALICIOUS

RTF

674.3 KB First seen: 2023-03-30

MD5: e24e51ec170b2341ef90321640fef797 SHA-1: d6066b94968ba76864f930eda55267549eae7f9c SHA-256: 7238f4e5edbe0e5a2242d8780fb58c47e7d32bf2c4f860c88c511c30675d0857

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF document contains multiple heuristics indicating the exploitation of CVE-2017-11882 through an embedded Equation Editor object. The embedded object is designed to trigger OLE activation and execute malicious code. The presence of 'Equation.3' as a ProgID strongly suggests this exploit vector. The decoded object data contains obfuscated JavaScript that likely downloads and executes a second-stage payload.

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 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000001a.bin` `160d53e0d9e87fdb156e5eb6a04c78424e98c3d72cc03e0c6238b2746ed0ca80`	rtf-objdata-decoded	RTF \objdata at offset 0x1A	343496 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off000a7bd9.bin` `6ef048de06e9c2e6b420e78a489e52123766b08549a074a5f95b98ffe8558f38`	rtf-objdata-decoded	RTF \objdata at offset 0xA7BD9	1709 bytes
`objdata_02_off000a7be9.bin` `8935eb605040753f89379b3f05c2cdaefba833ec64299ed9c258020f4c1217b0`	rtf-objdata-decoded	RTF \objdata at offset 0xA7BE9	36 bytes

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