RTF / .DOC malware analysis — malicious · ac341d5bcc1cd581

MALICIOUS

RTF / .DOC

775.1 KB

MD5: 5533ba86d6ef48289e411bf1919a2d9e SHA-1: d5f9c169be0781c0addc7f400e4d7edeee71bc10 SHA-256: ac341d5bcc1cd581006c72bf3a2a8fbb43c5eefa5734b8591a20d552035302ef

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). The heuristic firings indicate the presence of a native payload within the OLE object, suggesting it's designed to execute arbitrary code. The ".objupdate" directive further confirms the intent to activate and execute the embedded object. This points to a classic exploit document delivery mechanism.

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.
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 2 \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_off000000c3.bin` `d207a4c31b945da9af2c491516f966d103c0a5f63d5c2254e69d6c07b2de8f8b`	rtf-objdata-decoded	RTF \objdata at offset 0xC3	396624 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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