RTF malware analysis — malicious · 4279b80d24ca3767

MALICIOUS

RTF

844.8 KB First seen: 2020-08-25

MD5: 5ee67fe91d93bb6c1aa6a2240455e8fe SHA-1: c7307b73d83f5b856defd18d61b88300ad3badde SHA-256: 4279b80d24ca376737de678de4da242fe1e66a8ee5fd4675219a89da4cae61a9

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that decodes to a PE file, strongly indicating exploitation of the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for arbitrary code execution, enabling the attacker to run a malicious payload. The high entropy of the decoded object further supports the presence of packed or obfuscated malicious code.

Heuristics 5

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.
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_off000004a2.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x4A2	431901 bytes
SHA-256: `586e209eabc5acbb42fc90f7d2465448a24ebdde0ae83f7ea2afaa68e901fedd`
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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