RTF malware analysis — malicious · 09f4035b025f96e8

MALICIOUS

RTF

674.0 KB

MD5: 29e98c33276b2c4eed330f29654d59ce SHA-1: 0a2b12e860f790c94765df45f761ffc941e32208 SHA-256: 09f4035b025f96e8acd4b7dc1a1be6cc7979a1ed6710c5e9c470ad6303d97e42

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains a decoded Equation Editor payload, strongly indicating exploitation of CVE-2017-11882. This vulnerability is commonly used to execute arbitrary code, likely leading to the download and execution of a secondary malicious payload. The presence of OLE object data and the specific heuristic firings confirm this attack vector.

Heuristics 5

Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED

RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
Decoded Equation Editor payload + PE critical RTF_EQUATION_EDITOR

RTF decodes to an Equation Editor ProgID adjacent to OLE activation and the same decoded object stream contains embedded PE bytes. This matches the Equation Editor exploit surface used by CVE-2017-11882 / CVE-2018-0802 documents, while requiring payload evidence to avoid flagging benign Equation references.
\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
Suspicious extracted artifact info 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001151.bin` `01b47a1782a2dd25a3a2742b0c7c4628c062e991a56d3ae438740f80b965191c`	rtf-objdata-decoded	RTF \objdata at offset 0x1151	342830 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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