RTF malware analysis — malicious · 04fffe52f93084dc

MALICIOUS

RTF

5.44 MB First seen: 2023-03-18

MD5: bcb9dddc3a3c81e74a45cd2d2ddf7b5f SHA-1: 78cf832b7d8b741296c599748fddd2bd075335cb SHA-256: 04fffe52f93084dc3da76743e96951e7c09a872b4cbed9e4eff6d41851416d50

300 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File T1059 Command and Scripting Interpreter T1566 Phishing T1566.001 Spearphishing Attachment

The file is an RTF document containing an embedded OLE object, which is a strong indicator of exploitation. Specifically, the presence of RTF_EQUATION_EDITOR and CLAMAV_DETECTION heuristics, along with the ClamAV signature 'Rtf.Exploit.CVE_2017_11882-6584355-1', confirms exploitation of the Equation Editor vulnerability (CVE-2017-11882). This vulnerability is typically used to download and execute a secondary payload, leading to further system compromise.

Heuristics 7

Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED

RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
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.
Equation Editor CLSID critical RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
\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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~5703KB of hex-encoded data inside \objdata sections — may hide a payload
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_off0000067b.bin` `93fa305ea34761abb2f07ff6176e0cbbc93f88dd7806aa84ff1771de784fc264`	rtf-objdata-decoded	RTF \objdata at offset 0x67B	2851893 bytes

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