RTF malware analysis — malicious · ccf355facf8135a2

MALICIOUS

RTF

19.2 KB First seen: 2018-09-04

MD5: 10fd0d373f2330b977f8f448d0281239 SHA-1: a8e43c1d0e77be9c1679bd20c2a500f5c15aa360 SHA-256: ccf355facf8135a215b0365e02766c5984a1d49357d9d0b3b78d5d5d4eeb212e

180 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object that leverages the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This exploit is designed to execute arbitrary code, likely leading to the download and execution of a secondary payload. The presence of the Ole10Native stream and the objupdate heuristic strongly indicate an attempt at OLE object activation for exploitation.

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_off00001674.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1674	4650 bytes
SHA-256: `ebdbf1d4febe3c6315cb9027bf942ae2c3bf13cc22bf17df34ac98d942388d66`

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