RTF / .DOC malware analysis — malicious · 7204c67ef53332f9

MALICIOUS

RTF / .DOC

494.6 KB

MD5: 7de9efda6c2c8e937cc0458dd4021d03 SHA-1: fc1f384e648f688173272b0a4ce59e42090003da SHA-256: 7204c67ef53332f944007bbfdf4a74e21e18d68a269748594b91511520ef68b8

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object related to Equation Editor, specifically triggering CVE-2017-11882. This exploit is known to download and execute a second-stage payload, indicating a malicious intent to compromise the user's system. The presence of the ".bin" file and the high entropy of the carved artifact further support the execution of an unknown malicious binary.

Heuristics 5

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.
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_off0000006f.bin` `e29d1f0a5c50ab4d3cfc8a0967ca00aacac50dec8b17e0c55928b68d0f998dc6`	rtf-objdata-decoded	RTF \objdata at offset 0x6F	253090 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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