RTF / .DOC malware analysis — malicious · 2cdb2516668f9e2d

MALICIOUS

RTF / .DOC

1.75 MB First seen: 2023-09-05

MD5: 348408ffc9100a95c0ec107ff24ab0d5 SHA-1: d8af2d759942a76bfaeec6fc488c3703c0a87f5b SHA-256: 2cdb2516668f9e2de961b06690ab2837f1aead1ce8fa9596cf6bbffda583c9ae

222 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1559.001 Component Object Model T1027 Obfuscated Files or Information

The RTF document contains an OLE object with data that decodes to a PE file, strongly indicating exploitation of CVE-2017-11882. The presence of a large, high-entropy OLE object and the ".objupdate" directive further support this, suggesting the document is designed to automatically execute the embedded payload upon opening. No specific family could be identified from the static analysis.

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.
\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 ~1837KB 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_off0000008d.bin` `9efb2d655db1db9a04a8f131fbf7818476fafaa63dccbde25fdcb7df0a601333`	rtf-objdata-decoded	RTF \objdata at offset 0x8D	918661 bytes
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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