RTF malware analysis — malicious · 7f33703ff5f3e826

MALICIOUS

RTF

23.2 KB First seen: 2023-05-12

MD5: ee6851f7c64b5d019791616cc442f6e0 SHA-1: 72af3b772764ba00ceee26e48915dd800365c386 SHA-256: 7f33703ff5f3e826d4209149419211632cb3fc6599bee182fcbb7fd225e64ab8

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). The presence of `Ole10Native` stream and ` tf10s24{\*chars0{\* evtbl{\* rad{0}{\* rg{0}}}} \* objupdate\par\* objdata ...}` indicates that the OLE object is designed to be activated and execute its payload. The `objdata` heuristic firing further confirms the presence of embedded OLE object data, strongly suggesting exploitation of this known vulnerability.

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_off00000846.bin` `c8994822d2f2a2a5e078b66030f6996c8630b28c1be899e1baa6dc69f1cc0d57`	rtf-objdata-decoded	RTF \objdata at offset 0x846	4204 bytes

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