RTF / .DOC malware analysis — malicious · dc588ae1a3a5f06a

MALICIOUS

RTF / .DOC

673.4 KB

MD5: 8fc2325796c442f7b322f71177adde3f SHA-1: 5678919e366a7dd719eaa4dfc59f1d7babb8df95 SHA-256: dc588ae1a3a5f06a300c2620b3855d14c031ebb982d5ba77327756bbe525f864

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object, specifically a decoded Equation Editor payload. The presence of RTF_EQUATION_EDITOR and RTF_OBJUPDATE heuristics strongly indicates an exploit targeting the Equation Editor vulnerability. This vulnerability is commonly used to deliver second-stage malware, making this a likely initial access vector for a broader attack.

Heuristics 5

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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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_off0000005a.bin` `fcbc932aeb8b1719ef5548a46f2751ac4799cbc1088d8189c25bdd39f7cd1616`	rtf-objdata-decoded	RTF \objdata at offset 0x5A	344675 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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