RTF / .DOC malware analysis — malicious · b94b9e39295a228e

MALICIOUS

RTF / .DOC

2.09 MB

MD5: 6b4266756894b8e6cd719c373987e39e SHA-1: 23f3de2d85f02ab9ddaed7c19df3498ca5b65a19 SHA-256: b94b9e39295a228e954c5ab817ecc6f1ecc1e7b7f3caf7aba455106c86837c33

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 embedded OLE object with a ProgID indicative of Equation Editor, triggering critical heuristics for CVE_2017_11882_RELATED and RTF_EQUATION_EDITOR. The presence of a large, high-entropy OLE object data section suggests it is hiding a payload. The extasciitilde{}2MB of hex-encoded data within the OLE object further supports this. The exploit likely leads to the execution of a second-stage payload.

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 ~2193KB 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_off00000087.bin` `a6a42c9ef827f2af1b93bb34b05f1e0e44577f58df3a955980ceab1d474cf8a3`	rtf-objdata-decoded	RTF \objdata at offset 0x87	1096887 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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