RTF malware analysis — malicious · fb07de096e9f2c21

MALICIOUS

RTF

21.1 KB First seen: 2022-10-06

MD5: 0c5e9a51eae9e2189d1591e1200a84e3 SHA-1: ac66538351bdbfc1fd55290c50594071b63dba19 SHA-256: fb07de096e9f2c2114bbb1f8df5075a0a003e2bee7d6cb95f3f972728a4f5e10

260 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains an embedded OLE object with a CLSID associated with Equation Editor, and critical heuristics indicate exploitation of CVE-2017-11882. This vulnerability is commonly used to deliver malicious payloads. The presence of ` tf10s24{\fonttbl{\f0 Arial;}}

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_off00001a36.bin` `050608ea73043204c6964d405303e7f2d94ee7b58c2d1da87c85ff809ec1abd5`	rtf-objdata-decoded	RTF \objdata at offset 0x1A36	4173 bytes

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