RTF malware analysis — malicious · d791338813f0c79c

MALICIOUS

RTF

500.7 KB

MD5: 1fd81bc4f13faccafebf1f96476f7d81 SHA-1: 83eb93f98b88d0edbbdc6de6e20ad758d4855638 SHA-256: d791338813f0c79c877710f0e82e62bb211d80ea2113b2b7cd1e875be98be1e0

202 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains embedded OLE objects, specifically triggering the CVE-2017-11882 Equation Editor vulnerability. This indicates the file is designed to exploit this known flaw for initial execution. The presence of `objdata` and `Ole10Native` streams, along with the `CVE_2017_11882_EQUATION_OLE10NATIVE` heuristic, strongly suggests this exploit vector. The extracted artifact `objdata_00_off000008f2.bin` is the payload of this exploit.

Heuristics 6

Equation Editor Ole10Native payload — CVE-2017-11882 likely critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE

RTF decodes to an activated Microsoft Equation 3.0 OLE storage whose payload is a high-entropy Ole10Native stream rather than normal Equation Native/MTEF data. This is a weaponized Equation Editor RCE delivery shape consistent with CVE-2017-11882/CVE-2018-0802.
Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM

RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
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 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_off000008f2.bin` `53ccda463b7da9b9a00a209407a5e07cbbce25244da14919e8e00adff0808c84`	rtf-objdata-decoded	RTF \objdata at offset 0x8F2	145972 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.97, consistent with packed or encrypted content.

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