RTF / .DOC malware analysis — malicious · 622624a3d0ac661b

MALICIOUS

RTF / .DOC

23.0 KB First seen: 2023-01-26

MD5: d24b9d226e7c2bd4e6a76cf15a0618c2 SHA-1: 47879dc40b75f1be83a2328384afc25b7796d248 SHA-256: 622624a3d0ac661bb5f198a25976d5a991fce75edf656fc247d7bf8402c46049

220 Risk Score

Malware Insights

MITRE ATT&CK

T1204 User Execution T1204.002 Malicious File T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The file is an RTF document that exploits CVE-2017-11882 via the Equation Editor OLE object. It contains a lure instructing the user to 'Enable editing' to view the document, a common technique to bypass macro security. The exploitation of CVE-2017-11882 indicates an attempt to execute arbitrary code.

Heuristics 6

Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED

RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000493b.bin` `35faeac139fcf45e1ca74b9ff1add7daa157b988c407eb9962a59c04bcc222a1`	rtf-objdata-decoded	RTF \objdata at offset 0x493B	1359 bytes

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