RTF / .DOC malware analysis — malicious · 5600ff14a9cefe75

MALICIOUS

RTF / .DOC

2.42 MB

MD5: 93427ae26917fa3d4dc902d43f790b90 SHA-1: 393e06b13be277f81fee601b180fb3b9a8c4e06a SHA-256: 5600ff14a9cefe751c0f39157a79d3f7924706900c664bc18c58673afeb5419e

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object with decoded Equation Editor payload, indicating exploitation of CVE-2017-11882. The excessive hex data and the presence of a PE file within the OLE object suggest that this is a dropper mechanism designed to execute a secondary payload. No specific family could be identified, but the attack pattern is consistent with known Equation Editor exploits.

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 ~2533KB 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_off00000044.bin` `fc9fa942aa6ffe0abe0e42a4ddb0d32cc5ce37e032e5c85f141b0a346d14164b`	rtf-objdata-decoded	RTF \objdata at offset 0x44	1266610 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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