RTF / .DOC malware analysis — malicious · 6435692226e98564

MALICIOUS

RTF / .DOC

462.2 KB

MD5: ffb31cc89f24dabfd7760cc01dc36b9c SHA-1: 3835ae69986a6249a274b347cc5b6b1e45a4b3d5 SHA-256: 6435692226e985648fa245cbc6d3eeeefd834a8d77f2d448c5521b836e9e8db8

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 OLE object with a high entropy payload, strongly indicating the exploitation of CVE-2017-11882. This vulnerability allows for the execution of arbitrary code, which in this case is likely used to download and run a secondary malicious payload. The extracted artifact 'objdata_00_off00000c07.bin' is the decoded content of this OLE object.

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_off00000c07.bin` `114d765688af5afd305eac480f6618212b8799a855e37eb0add2e4395f2cce63`	rtf-objdata-decoded	RTF \objdata at offset 0xC07	104008 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.

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