RTF malware analysis — malicious · 2d1bf4f6e144bbf9

MALICIOUS

RTF

8.1 KB First seen: 2019-04-18

MD5: ba83729c830d364508cc55f24be31794 SHA-1: b2077a97570903386d89b2daa49dd227e04a878f SHA-256: 2d1bf4f6e144bbf9dbfe5a858e98d8492e5e417b20f658a376d96e0c20950123

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The critical heuristic 'RTF_EQUATION_EDITOR' and the ClamAV detection 'Doc.Exploit.CVE_2017_11882-6934206-0' strongly indicate exploitation of the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution, which is typically used to download and run a second-stage payload. The presence of OLE object data further supports the exploitation vector.

Heuristics 5

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
\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_off0000003b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3B	4130 bytes
SHA-256: `6d8041b440d8090d5326ba3819033e4537505e6615c33df1b5f73ce4653abb10`

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