RTF / .DOC malware analysis — malicious · fe4ed7ec3dfc97c0

MALICIOUS

RTF / .DOC

434.4 KB

MD5: a78afbd51915b89cacc9456c5c40c74e SHA-1: 7b052c049c7c9658317320e1eb2e0ca62e809e17 SHA-256: fe4ed7ec3dfc97c03a0b41432593e38f7cd132cfb57cd3595da90556fe0230e7

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1203 Exploitation for Client Execution

The RTF document contains a critical heuristic firing for CVE_2017_11882_RELATED, indicating the exploitation of the Equation Editor vulnerability. The presence of OLE object data and the ".objupdate" directive further support this. This vulnerability is commonly used to deliver a second-stage payload, likely executed from the embedded OLE object.

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_off000013f1.bin` `0b5e6d4a19ba86daa078009611cb5b2ac862b02469abaca2931029d07ff0b6d8`	rtf-objdata-decoded	RTF \objdata at offset 0x13F1	219663 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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