RTF malware analysis — malicious · 653dbf885ec99c1f

MALICIOUS

RTF

698.6 KB

MD5: 87ca898b33ee171e6e0b409a3b0fb617 SHA-1: ed3270a6ecb03bb758d2f6cd5b3ada474eff7745 SHA-256: 653dbf885ec99c1f78a99569cd401304c3d013b0ee49844667010739b0eaf80b

282 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882) to execute a payload. ClamAV identified the file as Rtf.Dropper.Agent-7643872-0, indicating its dropper functionality. The embedded OLE object, objdata_00_off000019d7.bin, is the primary artifact responsible for the exploit.

Heuristics 7

Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED

RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
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.
ClamAV: Rtf.Dropper.Agent-7643872-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Dropper.Agent-7643872-0
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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_off000019d7.bin` `10d00f5c137b2d3847d63126f802dcd0695c7e9e269f40ba27cdd567276d437f`	rtf-objdata-decoded	RTF \objdata at offset 0x19D7	354360 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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