RTF malware analysis — malicious · a9b3efdba32f07c3

MALICIOUS

RTF

1.46 MB

MD5: 8b7fefefb2b3595f22942c0506d284cc SHA-1: c13974feb884d64b9c490dec0b41d9ef5681e7c6 SHA-256: a9b3efdba32f07c399ce3d685684416c2d4373d6d2bc9afdd15b7405b7192ad0

162 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, leveraging the Equation Editor vulnerability. The large amount of hex-encoded data within the object suggests it's used to hide a malicious payload. The primary attack vector appears to be the exploitation of the Equation Editor component within Microsoft Office applications.

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1529KB of hex-encoded data inside \objdata sections — may hide a payload
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_off00000f19.bin` `296d05d9d2d2aaf22f96780dc8c7eda7cc880d26b13c3ad2b7368fbf9f1b29ee`	rtf-objdata-decoded	RTF \objdata at offset 0xF19	764587 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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