RTF malware analysis — malicious · 62f40035834c9811

MALICIOUS

RTF

4.53 MB First seen: 2024-12-13

MD5: 251ff44ae978e2140dd02f00b3f093a0 SHA-1: c9a9160e6c03a5debc9f1947a74215d52c7a1af6 SHA-256: 62f40035834c9811b5dcbfa3cbe0fd4e51d8678f3aca8fb0644b0a3043a1a362

240 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1559 Component Object Model Hijacking T1059 Command and Scripting Interpreter

The RTF document contains multiple OLE objects and specifically triggers the CVE-2017-11882 vulnerability through its Equation Editor component. This exploit is designed to embed and execute a payload, likely hidden within the large amount of hex-encoded data found in the OLE objects. The presence of RTF_EQUATION_EDITOR and CVE_2017_11882_ACTIVATION_RELATED heuristics strongly indicates this exploit vector.

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.
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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~4741KB of hex-encoded data inside \objdata sections — may hide a payload
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_off00000020.bin` `40ec7d85038bd10b351697b810f0c2497a442e9f6f7497f1cc494303cb11a250`	rtf-objdata-decoded	RTF \objdata at offset 0x20	2370594 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off004870fe.bin` `6ef048de06e9c2e6b420e78a489e52123766b08549a074a5f95b98ffe8558f38`	rtf-objdata-decoded	RTF \objdata at offset 0x4870FE	1709 bytes
`objdata_02_off0048710e.bin` `8935eb605040753f89379b3f05c2cdaefba833ec64299ed9c258020f4c1217b0`	rtf-objdata-decoded	RTF \objdata at offset 0x48710E	36 bytes

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