RTF / .DOC malware analysis — malicious · 933b975d07d8810b

MALICIOUS

RTF / .DOC

848.0 KB

MD5: dd50d10fbc4e360199d74b1733b3d9fa SHA-1: c8d7a763c21e8747db6c96760befd6d53db69ec8 SHA-256: 933b975d07d8810bd0197972864a475b905c4f109345c4ef44273655d9124d56

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object that decodes to a PE file, indicating a likely exploit targeting the Equation Editor vulnerability. This is further supported by the RTF_EQUATION_EDITOR heuristic firing. The embedded object is likely a downloader or initial payload, though its specific function cannot be determined without further analysis of the decoded artifact.

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_off00000043.bin` `fbc9e3c2e0c90ebbdb401dd6cf2bdbf15c7d830f05944c794ad579c3f7b140b5`	rtf-objdata-decoded	RTF \objdata at offset 0x43	434027 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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