RTF malware analysis — malicious · 2912e56548bc7ceb

MALICIOUS

RTF

23.2 KB First seen: 2023-04-29

MD5: 88a907c3e36d9ddfb106c9ad66408b46 SHA-1: 074d07f9f6632358aead0e1ae8f448f79f4db38b SHA-256: 2912e56548bc7ceb19333ab9b07f015959df1ae193ca27444079b92d9136c65b

260 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document containing an OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). The presence of `RTF_EQUATION_EDITOR` and `CVE_2017_11882_EQUATION_OLE10NATIVE` heuristics strongly indicates this exploit. The OLE object's `Ole10Native` stream contains decoded data, suggesting it's designed to execute arbitrary code, likely downloading a secondary payload. No specific family could be identified from the available evidence.

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.
Equation Editor CLSID critical RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
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_off00001463.bin` `a8a49ceae84e7968950caf194c421d949b34fa9c8b4b08a90595cdc641ccdca1`	rtf-objdata-decoded	RTF \objdata at offset 0x1463	3662 bytes

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