RTF / .DOC malware analysis — malicious · 6de5a6a916916823

MALICIOUS

RTF / .DOC

1.20 MB

MD5: 516028d299e8b6b9f947fdb4541a5d7e SHA-1: fa9c3d41dcd61c1dcade0ba7943882cf640a71cd SHA-256: 6de5a6a916916823583495dae424fa8ce2f54c33f2a67da83337b6f2579e816c

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF document contains an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). This exploit decodes and executes a Portable Executable (PE) file, which is likely responsible for downloading and running a secondary payload. The presence of a high-entropy carved artifact further supports the execution of a malicious binary.

Heuristics 6

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1252KB 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_off0000156c.bin` `14a1f9668959841a9a295cd068ced42fa3fa01c46bec4eaa345e97dce290a913`	rtf-objdata-decoded	RTF \objdata at offset 0x156C	626515 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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