RTF malware analysis — malicious · 5c30d252e949ccee

MALICIOUS

RTF

202.1 KB First seen: 2019-04-18

MD5: e95e10cc3ad00bf187521003739d870b SHA-1: 0c5a945448aebc62b85c69976d79f529ed3043b8 SHA-256: 5c30d252e949ccee9219bd14cf4bacb510b76d0edb5919cd2b05f1010f6d8cc9

260 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that leverages a known vulnerability in the Equation Editor component. This vulnerability is likely used to execute code, potentially mshta.exe, to download and run a secondary payload. The ClamAV signature 'Doc.Dropper.Agent-7115243-0' further indicates a dropper functionality.

Heuristics 6

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
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.
ClamAV: Doc.Dropper.Agent-7115243-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-7115243-0
Reference to mshta.exe high SC_STR_MSHTA

Reference to mshta.exe
\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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000003d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3D	61715 bytes
SHA-256: `a505d257dfc821e807c11cc432205ab84cffc22b3315d1b9ed5f7dd55c6b07e5`

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