RTF malware analysis — malicious · f15f870c2b71f724

MALICIOUS

RTF

3.88 MB

MD5: cfe14e871bcc9e15d6c27a28c093e3d1 SHA-1: 45c164a7e5fbb934bc0cd85766ecedf65a6490b3 SHA-256: f15f870c2b71f724d4bc08a1fe0dcfc141fd85185d9e79e909cb393e24fcdd4a

222 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object specifically identified as related to the Equation Editor vulnerability CVE-2017-11882. The presence of excessive hex-encoded data within the OLE object and the objupdate directive strongly suggest that the object is designed to be activated, likely leading to the execution of a second-stage payload. The high entropy of the decoded OLE object further supports the presence of obfuscated 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.
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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~4064KB of hex-encoded data inside \objdata sections — may hide a payload
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_off000000b0.bin` `1b3af917643c1f5c38ed42ba1e96713574ee5b6c214080e7b399f933831f2a6d`	rtf-objdata-decoded	RTF \objdata at offset 0xB0	2032447 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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