RTF / .DOC malware analysis — malicious · c511853d2df7a1c9

MALICIOUS

RTF / .DOC

2.51 MB

MD5: 6fc28f54b5a3b85ae1589c33dda67ea1 SHA-1: 283f84260667f1d76a434c7ba1bc21a1b8978abd SHA-256: c511853d2df7a1c91ac2150f3f4973c1606db8f31a3aa5c676528c1779bc21a5

242 Risk Score

Malware Insights

MITRE ATT&CK

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

The RTF document contains multiple indicators of malicious activity, including embedded OLE objects and specifically the RTF_EQUATION_EDITOR heuristic, which strongly suggests exploitation of CVE-2017-11882. The presence of a large, high-entropy embedded artifact further supports the likelihood of a hidden payload. The attack pattern involves luring the user to open the document, triggering the exploit which then likely executes a second-stage payload.

Heuristics 7

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 ~2519KB 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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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_off000000c8.bin` `f8459dfe765b8bb459b35c3fc2b57eb167633fe427ab323df36e3f9ff31e30a3`	rtf-objdata-decoded	RTF \objdata at offset 0xC8	1272744 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.

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