RTF / .DOC malware analysis — malicious · 4a81e3ea2fd1626e

MALICIOUS

RTF / .DOC

311.1 KB

MD5: 595511ed7dd8030d7a9d99f6dc474f1c SHA-1: 7fee905c4b230b8227a4fd5fdb93f658f022c974 SHA-256: 4a81e3ea2fd1626e822cb44ebde83ca9dce1aec5908540d7fa81f8bfffe16356

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document containing an embedded OLE object, specifically targeting the Equation Editor vulnerability (RTF_EQUATION_EDITOR). The ".objupdate" directive indicates that the embedded object is designed to be activated automatically, triggering the exploit. The extracted artifact 'objdata_00_off000010f8.bin' is likely the payload or a component thereof. The document body is heavily obfuscated and unreadable, providing no direct clues to the user-facing lure.

Heuristics 4

Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
\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.
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_off000010f8.bin` `23ddde7ecec6dae35f14c2ed82404242f21e6cc6b56db10f6f3a279b80cc42a7`	rtf-objdata-decoded	RTF \objdata at offset 0x10F8	156791 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

Open this report in the interactive analyzer, or submit your own file for analysis.