RTF malware analysis — malicious · 0efd3949bdca6871

MALICIOUS

RTF

384.3 KB

MD5: 99f1bdd67c558c943d6ba062bc327d28 SHA-1: 3694f22edb747d065595c4760fa25119581a43f1 SHA-256: 0efd3949bdca68716bd115e68de2f6247135e19dca8ff9e300eea9c7e9b4260f

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document containing OLE object data, specifically related to the Equation Editor. Critical heuristics indicate the presence of CVE-2017-11882, a known vulnerability that allows for arbitrary code execution when exploited via an embedded OLE object. The document likely serves as a malicious attachment to lure victims into opening it and triggering the exploit.

Heuristics 5

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.
Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
\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 2 \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_off000000c9.bin` `b23d25e794c0866ae0ee0bbcecc6ffaf946c39a9ea7a339a45d1aaa5a9da039a`	rtf-objdata-decoded	RTF \objdata at offset 0xC9	181021 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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