RTF / .DOC malware analysis — malicious · 6c1b4e7a9293f13e

MALICIOUS

RTF / .DOC

337.2 KB

MD5: 20fd7e5095e76d04d33d30a75ab371ac SHA-1: 31549d4f459e52ec34a0cf2c20a1f79dd08a385e SHA-256: 6c1b4e7a9293f13eeca94e2ce5aa97d358492bd3e9fa76716c119300e6d5da37

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data, specifically related to the Equation Editor. Critical heuristics indicate a likely exploitation of CVE-2017-11882, which is a known vulnerability allowing for client execution. The extracted artifact 'objdata_00_off000004be.bin' is the decoded OLE object payload, likely containing the second-stage malware.

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 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_off000004be.bin` `477485fe08eb46365a551bb00cbf05e554c35d813b83b6685fef9a461741060b`	rtf-objdata-decoded	RTF \objdata at offset 0x4BE	171883 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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