RTF malware analysis — malicious · 60017e193cfd0df0

MALICIOUS

RTF

1.58 MB First seen: 2024-12-13

MD5: d37e71880beb8f453553c778aa07718a SHA-1: 8e650ecbbcd710f32b859aa34feb340768ea04cb SHA-256: 60017e193cfd0df017eb8d0cc5f4bfc49593d90430a3e89a287f6afb83672236

240 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File Execution T1559.001 Component Object Model Hijacking

The RTF document contains multiple indicators of malicious activity, including OLE object data and specific heuristics pointing to the CVE-2017-11882 Equation Editor vulnerability. The presence of large hex-encoded data blocks within the OLE object suggests the embedding of a payload. The document body contains obfuscated JavaScript-like code that appears to be designed to deobfuscate and execute further malicious content.

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 ~1647KB 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` `8739aa14d409cfa0bed4b5e265d4cba26b5985ad8b5665c6414d62da5fc1d2a6`	rtf-objdata-decoded	RTF \objdata at offset 0x20	823909 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00193d84.bin` `6ef048de06e9c2e6b420e78a489e52123766b08549a074a5f95b98ffe8558f38`	rtf-objdata-decoded	RTF \objdata at offset 0x193D84	1709 bytes
`objdata_02_off00193d94.bin` `8935eb605040753f89379b3f05c2cdaefba833ec64299ed9c258020f4c1217b0`	rtf-objdata-decoded	RTF \objdata at offset 0x193D94	36 bytes

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