RTF malware analysis — malicious · 8924eb9498e658c1

MALICIOUS

RTF

22.2 KB First seen: 2023-03-30

MD5: 2c5cf406f3e4cfa448b167751eaea73b SHA-1: 667c5c6660607276bc76af4c87dc2daf67605115 SHA-256: 8924eb9498e658c131a56354ee7f6577e51e028a518b614a027911d2cdf4e279

160 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 with embedded data, as indicated by the RTF_OBJDATA and RTF_OLE10NATIVE_STREAM heuristics. The RTF_EQUATION_EDITOR and RTF_OBJUPDATE heuristics strongly suggest exploitation of the Equation Editor vulnerability (CVE-2017-11882) to trigger OLE object activation. This typically leads to the execution of a secondary payload, likely a downloader, which is consistent with the malicious verdict.

Heuristics 4

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
\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_off0000106c.bin` `b6098d28ae048c2582b1ab8da0269acb7892185339e24253fbc499d90a8c2f55`	rtf-objdata-decoded	RTF \objdata at offset 0x106C	3659 bytes

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