RTF / .DOC malware analysis — malicious · 11df1e114c9db086

MALICIOUS

RTF / .DOC

347.6 KB

MD5: 04881d2d5c5b2c4ce27dda4377995ecc SHA-1: ca44a94f33d9b0342e0438eaf82f2dd55e31c980 SHA-256: 11df1e114c9db08604739d78d04e3918fedbbac7dbe5afd3ca3cf4a80bdc51c5

202 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document that contains an embedded OLE object, specifically identified as a likely exploit for CVE-2017-11882 targeting Microsoft Equation Editor. This exploit is designed to download and execute a secondary payload, indicated by the high entropy of the extracted OLE object data. The presence of the ".bin" file suggests a dropped executable.

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 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_off0000174d.bin` `4eaf9c511e56702c2a6067ca6ac6b03d199faf774811e55448293e4a4e9c864b`	rtf-objdata-decoded	RTF \objdata at offset 0x174D	63564 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.94, consistent with packed or encrypted content.

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