RTF / .DOC malware analysis — malicious · deddc423ac3f5913

MALICIOUS

RTF / .DOC

437.7 KB

MD5: b04d8b5cd90707d18e835e97e3443f52 SHA-1: 268c3f967c0194952eb88ababccb3c62bfca544e SHA-256: deddc423ac3f5913119214e980cca36ef224d839422c33ce79203721e1b88e13

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object related to Equation Editor, specifically triggering the CVE-2017-11882 vulnerability. The presence of ".objupdate" further indicates that the OLE object is designed to be activated automatically. This suggests the file is a dropper or exploit document intended to execute a secondary payload via the known Equation Editor vulnerability.

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_off0000009b.bin` `48edcd09b30a259a6ce045993d5ac8660b02f7a76ada238ed7e3d21b5625b9f6`	rtf-objdata-decoded	RTF \objdata at offset 0x9B	223790 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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