RTF malware analysis — malicious · e9e38b2108b6dc99

MALICIOUS

RTF

14.8 KB First seen: 2022-09-22

MD5: 4ca4b59bef307a91d7757d002f4b70a8 SHA-1: ad741a688d86c35ee6972a6c4fb723a8541807dc SHA-256: e9e38b2108b6dc9911fac6c1e6bf7b8fa017847f56ceeab19b96f187db9e5bac

200 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an OLE object with Ole10Native stream data, strongly indicating the exploitation of CVE-2017-11882. This vulnerability is commonly used to deliver a second-stage payload. The presence of RTF_OBJAUTLINK and RTF_OBJUPDATE heuristics further confirms the intent to automatically activate the embedded object upon opening.

Heuristics 5

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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000081.bin` `415937058e5009dadbf370bdaaad23ed0559e2217519b759b2a96800d02fc380`	rtf-objdata-decoded	RTF \objdata at offset 0x81	4164 bytes

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