RTF / .DOC malware analysis — malicious · 3df8777a53d8503b

MALICIOUS

RTF / .DOC

1.64 MB

MD5: 7fd41eb60ae16238fd551aeff8f2ee81 SHA-1: 7f2a0bd5a5190495fedf47d7aedebedc1a6a3a7b SHA-256: 3df8777a53d8503b38653fd6edf3ea332dea7f569d1d272277fe6524e5e6abc8

202 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: User Execution: Malicious File T1027 Obfuscated Files or Information

The RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). The critical RTF_EQUATION_EDITOR heuristic confirms a decoded Equation Editor payload and a PE file. The excessive hex data within the OLE object likely hides this payload. The file is classified as malicious, and the primary attack vector is the exploitation of the Equation Editor component.

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.
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 ~1723KB 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_off000005a0.bin` `0fcbe056e725e6dfffbd93371829cbf2c089ecc8553e4c7e01ed399d2c3167d1`	rtf-objdata-decoded	RTF \objdata at offset 0x5A0	861559 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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