RTF malware analysis — malicious · ccbe33341a3bdff6

MALICIOUS

RTF

27.5 KB First seen: 2023-04-05

MD5: e1ee12ca06b9c3b7649b9535749cf03b SHA-1: 7fca1fb8462bd809dd83f10725358da08786214b SHA-256: ccbe33341a3bdff6ef98b11b040e78d1b583a47371fe432947e924c2dec9261c

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 CVE-2017-11882 vulnerability in the Equation Editor. This exploit is designed to execute arbitrary code, likely to download and run a secondary payload. The presence of the Ole10Native stream and the critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE strongly indicate this attack vector.

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_off00001acb.bin` `97bf7bd68e021eb4f84937cf129bdf6707cd2f77e096de702e235fed9e145b25`	rtf-objdata-decoded	RTF \objdata at offset 0x1ACB	4173 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.