RTF / .DOC malware analysis — malicious · 26e826e1d1aa8a3b

MALICIOUS

RTF / .DOC

933.6 KB

MD5: 36cc80bdee69eabf4e2ca8c3ab7c0e1f SHA-1: 7ac657a86731dc6144bd362bd1d0c737fd59b064 SHA-256: 26e826e1d1aa8a3b450276fd217ce021300b5194ab38af2bdd0e00b6656c1026

142 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 leveraging the Equation Editor. Heuristics indicate that this object is a decoded Equation Editor payload that results in a PE file. This strongly suggests an exploit targeting the Equation Editor vulnerability to download and execute a secondary payload. No document body text was available for analysis, but the presence of the Equation Editor exploit is a clear indicator of malicious intent.

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_off00001640.bin` `f4a3bb881677e2539f2d712f89bb88b5cbd0901c05b1fdb36e220a5bc6968a13`	rtf-objdata-decoded	RTF \objdata at offset 0x1640	475085 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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