RTF malware analysis — malicious · 96ad693e5e306faf

MALICIOUS

RTF

1.68 MB First seen: 2023-08-24

MD5: 016d7a6e39baa14a8fa707b9b4b0825b SHA-1: 0ec1830329c2e35995a5bbef5d2011ce75d376b8 SHA-256: 96ad693e5e306fafb821cf4a0af5cbe86712949bc209d9cf92a4b562271898d1

222 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF document contains an OLE object with a ProgID indicative of Equation Editor, triggering critical heuristics for CVE-2017-11882. The presence of a large, high-entropy OLE object and the \objupdate directive strongly suggest that the embedded object is a malicious payload designed to be executed upon opening the document, likely exploiting the known Equation Editor vulnerability.

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 ~1763KB 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_off0000008d.bin` `5002d2a654aff32855f7af8adca6a867e61c757609f41943545cfa8bb0c1f0e6`	rtf-objdata-decoded	RTF \objdata at offset 0x8D	881823 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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