RTF / .DOC malware analysis — malicious · 14f75a1d97a84e7a

MALICIOUS

RTF / .DOC

312.9 KB

MD5: 7b0e6fad7e20cb1efc43fa6bd6bab286 SHA-1: 3e484a8db616b36448b2861a01d261ba11cc9d4e SHA-256: 14f75a1d97a84e7ac888ba43a28284bec171ce5cb5d2cb2c679e21f71e478cf8

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data, specifically a decoded Equation Editor payload. Heuristics indicate a critical vulnerability, CVE-2017-11882, which is known to be exploited for client execution. The presence of this exploit suggests the file was likely delivered as a spearphishing attachment, aiming to execute a secondary payload.

Heuristics 5

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.
\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_off0000174d.bin` `97436fe188cc8cb07d53cce1579f82da43fc4503f059f0f1c8cdc9c62eb54af2`	rtf-objdata-decoded	RTF \objdata at offset 0x174D	157145 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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