RTF / .DOC malware analysis — malicious · dfa31e28081cce2e

MALICIOUS

RTF / .DOC

300.7 KB

MD5: ea03cd5ce14260de195eaecb7ebb9879 SHA-1: aa9ae2913eb158094344c18fa6361bb4aee6cf3f SHA-256: dfa31e28081cce2e3b943fe061188601e39f938f78171ba68782db427512a79d

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF file contains an embedded OLE object that decodes to a PE file, indicating a malicious payload delivery mechanism. The critical RTF_EQUATION_EDITOR heuristic specifically points to an exploit targeting the Equation Editor component, commonly used for initial access. The presence of extasciitilde{}objupdate further suggests an attempt to automatically activate the embedded object, likely leading to the execution of the decoded payload.

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_off00000073.bin` `27564cb2cf86810a8b726e3184f5cca9182c09388144665d895605304ce004f4`	rtf-objdata-decoded	RTF \objdata at offset 0x73	153788 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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