RTF malware analysis — malicious · 19ede468da200d63

MALICIOUS

RTF

6.79 MB

MD5: 85a3f6aa72c0c0a6ae58c45a32958185 SHA-1: f6ddf2614fa4ffb7cb69e2f7faf2ea0b42eca02d SHA-256: 19ede468da200d63efd0acb085e7ef3a36dd3eda5d40488d2570eaae7041c5ea

222 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object specifically related to the Equation Editor vulnerability, CVE-2017-11882. The presence of ` ft_equation_editor` and `CVE_2017_11882_RELATED` heuristics strongly indicates exploitation of this known vulnerability. The large amount of hex-encoded data within the OLE object suggests it is used to hide a secondary payload, likely executed via the ` ft_objupdate` directive.

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 ~7123KB 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_off000000cf.bin` `a3090bcdfe29edc68a1e47ac352b3a46cd2769de7f05dbac52c28deab8664b90`	rtf-objdata-decoded	RTF \objdata at offset 0xCF	3561619 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

Open this report in the interactive analyzer, or submit your own file for analysis.