RTF malware analysis — malicious · 6944148645a8de11

MALICIOUS

RTF

5.43 MB First seen: 2023-07-05

MD5: a3c6c37292b50a3e323ec2d91eeac832 SHA-1: 2da4ae306a98f1515a831ca3d449f137b376f616 SHA-256: 6944148645a8de11f36fe90fb4dc459a154f66a8140395473b9e58d258aea490

320 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an RTF document containing an embedded OLE object, which is a strong indicator of exploitation. Heuristics confirm the presence of Equation Editor CLSID and OLE object data, specifically triggering the CVE-2017-11882 detection. The document body contains a lure instructing the user to 'enable editing', a common tactic for macro-based malware. The primary attack vector is the exploitation of CVE-2017-11882 via the embedded Equation Editor object.

Heuristics 8

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 ~5688KB 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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000fd9.bin` `1cc6b8ccd9d96641fb1e1ec24792047344fdfb0e740a162adb7e978660863247`	rtf-objdata-decoded	RTF \objdata at offset 0xFD9	2844221 bytes

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