RTF malware analysis — malicious · c6d5c2e04edf5e16

MALICIOUS

RTF

14.2 KB First seen: 2019-01-11

MD5: a4f20541b58b988ff65653062650bba0 SHA-1: c0d1ad96dee22f3aaa58c5b1804415d8eb8e8ecc SHA-256: c6d5c2e04edf5e16833578fd22779acf4dcba8d3de6d1ff9b84d0ececf5e66e0

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 to download and run a second-stage payload. The presence of the OLE object and the specific heuristic firings strongly indicate exploitation of this known vulnerability for client execution.

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_off00000800.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x800	4145 bytes
SHA-256: `300d7583d610bcc25f06c480173ff08014dc78cb9cb02ae1c2ed1d8118b60120`

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