RTF malware analysis — malicious · feac2864dd0dde4d

MALICIOUS

RTF

1.21 MB

MD5: cdb6c112f58e80ca4aedbd4706d017a6 SHA-1: 3a5bd322faea19daf63ef8b49a33f07273c99366 SHA-256: feac2864dd0dde4d9fa58c93930c21c8a0786de9f1260e742b61447c826f7fb9

182 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059 Command and Scripting Interpreter T1566 Phishing T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object, specifically decoded as a PE file from the Equation Editor. This indicates an attempt to exploit a known vulnerability (CVE-2017-11882) to execute arbitrary code. The presence of ".objupdate" suggests that the embedded object is designed to be activated automatically, likely leading to the download and execution of a secondary payload. The large amount of hex-encoded data within the OLE object further supports the hiding of a malicious 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 ~1256KB 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_off00001e09.bin` `f44aa4ef2390168b7f09158725845d523f8df62966031958c44ce55c83db8ce8`	rtf-objdata-decoded	RTF \objdata at offset 0x1E09	628051 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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