RTF malware analysis — malicious · 5e123da0222a43a2

MALICIOUS

RTF

250.4 KB First seen: 2024-12-03

MD5: 02cf749e6b5a587fa8c0fe5eccf68c36 SHA-1: d2c2980731e1a461bac9500d98cda6aaca5fad51 SHA-256: 5e123da0222a43a219c9906fbb27748d1c3f8273855a9bc27c20720f58ed563a

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1204.002 User Execution: Malicious File

The sample is an RTF document containing an embedded OLE object that leverages the CVE-2017-11882 Equation Editor vulnerability. The presence of `RTF_OBJDATA`, `RTF_OBJEMB`, `CVE_2017_11882_EQUATION_OLE10NATIVE`, and `RTF_OLE10NATIVE_STREAM` heuristics strongly indicates exploitation of this known vulnerability. This technique is commonly used to deliver a second-stage payload, likely a downloader or dropper.

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.
\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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001c10.bin` `781d366e36d4eb1e7232e4b74a0ddb20a15f9f0490ef0fb0208d4e8ece71fc96`	rtf-objdata-decoded	RTF \objdata at offset 0x1C10	4195 bytes

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