RTF / .DOC malware analysis — malicious · 974265d63a3adb74

MALICIOUS

RTF / .DOC

4.58 MB

MD5: e54c83541891a4639445d3ed568764f1 SHA-1: c8165cd9704dcb8ff1973d63711d60d9a89a8c0d SHA-256: 974265d63a3adb74ff7536ef848f862819a8fc176a61775998c14c506ca99358

222 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains multiple indicators of malicious activity, including embedded OLE objects and excessive hex-encoded data. Specifically, the critical heuristic 'CVE_2017_11882_RELATED' strongly suggests exploitation of CVE-2017-11882 through a decoded OLE object. This indicates the file is designed to deliver and execute a secondary payload, likely a downloader or dropper, leveraging this known 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 ~4798KB 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_off000000ea.bin` `b4427d6b9b21820dcf954a9f43f4bbd46bacb231ed7b1eb838efcedd72818935`	rtf-objdata-decoded	RTF \objdata at offset 0xEA	2399515 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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