RTF / .DOC malware analysis — malicious · fd2198f7abdbeaa6

MALICIOUS

RTF / .DOC

460.8 KB

MD5: ab8c927fef01c470fe7206a0b043d763 SHA-1: c9420088ea76d0bfdb831d244f248c172eee69fb SHA-256: fd2198f7abdbeaa61d74b78a67eca916ed8297a4889680529ee86a27ca860bdd

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The `RTF_EQUATION_EDITOR` and `RTF_OBJUPDATE` heuristics indicate that the document is designed to exploit this vulnerability, likely to download and execute a secondary payload. The `RTF_OBJDATA` heuristic further confirms the presence of embedded OLE object data. While no specific URLs or scripts were extracted, the exploitation of the Equation Editor is a strong indicator of a malicious document delivery mechanism.

Heuristics 4

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_off000014a8.bin` `db4cf76639091a78d88458254b9cfe7c462c45c51bb2d9dbb036817eb99035bf`	rtf-objdata-decoded	RTF \objdata at offset 0x14A8	233215 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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