RTF / .DOC malware analysis — malicious · 19bcc7719dbc54ff

MALICIOUS

RTF / .DOC

1.21 MB First seen: 2023-02-14

MD5: 7b4c587258d9324728348ca61cbb0f3d SHA-1: be031c8209d63365dea8a56cc917d7db65110325 SHA-256: 19bcc7719dbc54ffcf2d06efff92ef6714b80ba5eb32d9c9b2e55e9760051aab

262 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter

The RTF file contains an OLE object specifically related to the Equation Editor vulnerability (CVE-2017-11882). This exploit is designed to decode and execute a PE file embedded within the object data. The presence of excessive hex data and the high entropy of the decoded object further indicate a hidden payload. The attack pattern is consistent with a malicious document designed to leverage this known vulnerability for initial execution.

Heuristics 7

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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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 ~1272KB 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_off0000007b.bin` `8820ad2548e3936e8d16764fde91d31623a89a88a59a0a47302cc14551e080b4`	rtf-objdata-decoded	RTF \objdata at offset 0x7B	636456 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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