RTF malware analysis — malicious · e672ff92bb7f3e9b

MALICIOUS

RTF

1.47 MB

MD5: 1e8ab4a990c2b2675148819385dffbba SHA-1: 31d9c6aaf35f3fcb86350cfede78941463f843f1 SHA-256: e672ff92bb7f3e9bdccee03742f11d0de3bb3df669b079a2eb3daca3812dc998

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability. Heuristics indicate the presence of a decoded Equation Editor payload and a PE file, suggesting the RTF is designed to exploit this vulnerability. The excessive hex data and the suspicious extracted artifact further support the malicious nature of the file, likely serving as a dropper for a secondary payload.

Heuristics 6

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1529KB of hex-encoded data inside \objdata sections — may hide a payload
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
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_off00001f56.bin` `9ac98a75d84aa3d51991a652eb5c318a6fa03d249e093d061aecc2c9212ebe16`	rtf-objdata-decoded	RTF \objdata at offset 0x1F56	764959 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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