RTF / .DOC malware analysis — malicious · 9a642ba97563f4f0

MALICIOUS

RTF / .DOC

370.1 KB

MD5: a881b643ed81ee13efb292dafdefbac7 SHA-1: fcdc63e19fc074ed4f1f0c8ca61df6bb2505db2c SHA-256: 9a642ba97563f4f0f433c8422381953cbc97b654b39364d2ef3245dd22349f16

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object with a split Equation Editor ProgID, indicating an attempt to exploit the Equation Editor vulnerability (CVE-2017-11882). The ".objupdate" directive forces the OLE object to activate, likely triggering the execution of a malicious payload. The heuristic firings strongly suggest this is a downloader or dropper for further malicious activity. No document body text was available for analysis, but the technical indicators are sufficient.

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_off00001d49.bin` `06e2668d9ea0a393fb2564a5f7b8db3f1777cf2a0e9315333fd0774d2ddff91d`	rtf-objdata-decoded	RTF \objdata at offset 0x1D49	185678 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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