RTF / .DOC malware analysis — malicious · df57e15564ae9481

MALICIOUS

RTF / .DOC

1.85 MB

MD5: 94b3ca2aff9f9bec72d8f027ad924598 SHA-1: 7c92195c569e729dd393591c2a72099ec433113b SHA-256: df57e15564ae94811e38e1bb75e3744e17c34ade96d1eb64881d15974ea5f166

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The heuristics indicate that the object data contains a decoded PE file, suggesting it's a downloader or dropper. The excessive hex data and the presence of an extracted PE file strongly suggest the document's purpose is to exploit this vulnerability to execute a secondary payload. No specific family could be identified.

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 ~1934KB 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_off000005cc.bin` `7eec864f91af9fdcb401534e535979c8c7622225d8efb5953ee17c6768291513`	rtf-objdata-decoded	RTF \objdata at offset 0x5CC	967213 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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