RTF / .DOC malware analysis — malicious · 8ad4673a5a2ee223

MALICIOUS

RTF / .DOC

2.48 MB

MD5: 0d9a3c343c2348d4f629eacc735cc735 SHA-1: a9d6d25da5138418dbc6f8a25fe9dd9f3c7bd169 SHA-256: 8ad4673a5a2ee2234da8c27616549d2071d43e769850dad6b09ee95ed939d44c

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains embedded OLE object data, specifically a decoded Equation Editor payload. This indicates an exploit targeting the Equation Editor vulnerability. The excessive hex data and the presence of a PE file within the OLE object suggest that this file is designed to download and execute a second-stage payload. No specific family could be identified, but the delivery mechanism is clearly an exploit.

Heuristics 5

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 ~2596KB 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
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_off00000042.bin` `d755925bd6e0f49d66b2769cf04782fb48406981dc0eb6a742b2ac1b0294933d`	rtf-objdata-decoded	RTF \objdata at offset 0x42	1298161 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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