RTF / .DOC malware analysis — malicious · 7a64228af2c6716d

MALICIOUS

RTF / .DOC

1.85 MB

MD5: b11b8aa18cf3b51300a6bcc39c6cc758 SHA-1: 46fb418b58a1973980765a629818f55e1b17c2e9 SHA-256: 7a64228af2c6716d4f643714e7bcc0ab3fb283e51a060ae5c8eb1fdf322ccd86

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document that contains an embedded OLE object, identified as a likely Equation Editor exploit (CVE-2017-11882). This exploit is known to download and execute arbitrary code. The presence of a large, high-entropy carved artifact (objdata_00_off00000946.bin) strongly suggests it contains the malicious payload. No document body text or scripts were extracted, but the heuristics clearly indicate an exploit attempting to achieve code execution.

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.
\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 ~1934KB 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_off00000946.bin` `a28cc7421a188e15b3d7474ef1b9d7fc4ddbe178bf4ad173748cfdd02d30065f`	rtf-objdata-decoded	RTF \objdata at offset 0x946	967111 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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