RTF malware analysis — malicious · 83e1475e27eb812a

MALICIOUS

RTF

2.19 MB First seen: 2020-04-06

MD5: 602d0eff372cb508b5bd6272b1d93351 SHA-1: a33092605180c2351b7a8d8495e98683a638b66e SHA-256: 83e1475e27eb812aea7dbb2614435f7abef1a4e5a4482dfa559fb3a2b0649a34

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object that decodes to a PE file, strongly indicating exploitation of CVE-2017-11882. The presence of ".objdata" and ".objupdate" sections, along with high entropy in the decoded object, further supports this. The file likely serves as a malicious attachment delivered via spearphishing, aiming to execute a secondary payload.

Heuristics 6

Decoded Equation Editor payload + PE critical CVE likely RTF_EQUATION_EDITOR

RTF decodes to an Equation Editor ProgID adjacent to OLE activation and the same decoded object stream contains embedded PE bytes. This matches the Equation Editor exploit surface used by CVE-2017-11882 / CVE-2018-0802 documents, while requiring payload evidence to avoid flagging benign Equation references.
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.
\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 ~2294KB of hex-encoded data inside \objdata sections — may hide a payload
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_off0000006d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6D	1147350 bytes
SHA-256: `fea4bc1a51beea7c32e44c325ce4210d7090188fbc1fd139380b6af60ce07a4e`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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