RTF malware analysis — malicious · 7ed0f789ec6f1ab8

MALICIOUS

RTF

889.4 KB First seen: 2023-01-11

MD5: 6b4c4ef563c930851dfa556337f9715e SHA-1: 2cc45d81a7871a9e59cec4f49c49a18ccd32d70a SHA-256: 7ed0f789ec6f1ab8958e26c5a8184ecd557f869cc6407061c6634916108b3505

222 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an OLE object specifically targeting the Equation Editor vulnerability (CVE-2017-11882). This vulnerability is known to be exploited to execute arbitrary code, typically to download and run a secondary payload. The presence of a decoded PE file within the OLE object strongly indicates the execution of malicious code.

Heuristics 6

Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED

RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact attribution was not recovered.
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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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_off0000007c.bin` `a21b1aa27f6ec61db8b83720a41a58aea8b88bdaf7089ddc15c103b737beecbf`	rtf-objdata-decoded	RTF \objdata at offset 0x7C	455247 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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