RTF / .DOC malware analysis — malicious · c97ccb44ae6a0d90

MALICIOUS

RTF / .DOC

395.8 KB

MD5: 47d954d5fe653943fbc170f75b8778ed SHA-1: 58e5bc6777ccc5d82a9e21f44e62ccec047ca77e SHA-256: c97ccb44ae6a0d90cce4df1259fd99a135a5aa3f0aec62cf1b1dabeb359ca14f

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF document contains an embedded OLE object that leverages the CVE-2017-11882 vulnerability in Equation Editor. This vulnerability allows for the execution of arbitrary code, likely to download and run a second-stage payload. The high entropy of the decoded object further suggests it contains packed or encrypted malicious code.

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.
Decoded Equation Editor payload + PE critical 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.
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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_off00000064.bin` `d752b7e756fc0ce5d7238fdcb8b347c568504a63244ee956bf6da0ade2fe83b6`	rtf-objdata-decoded	RTF \objdata at offset 0x64	202519 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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