RTF malware analysis — malicious · e26f290f089e805b

MALICIOUS

RTF

7.64 MB First seen: 2021-06-17

MD5: 8f30984c110e2350e4bbdad8a23e2b75 SHA-1: 44a4ec7311b21cb8d09e9a428b9f4133a20fcd21 SHA-256: e26f290f089e805b487650274290ad4a21edf8dbb102a3c9c1bece7e76291d05

262 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple indicators of exploitation, including OLE object data, Equation Editor CLSID, and a composite moniker, all pointing to the exploitation of a vulnerability in Microsoft Equation Editor. The heuristic 'EXTRACTED_FILE_STATIC_TRIAGE' specifically flags a suspicious extracted artifact with 'Shellcode URL', indicating the file's intent to download a secondary payload. The embedded URL, though marked as benign, is still included as a potential IOC given the context of the exploit.

Heuristics 7

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
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.
Suspicious extracted artifact critical EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
\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 2 \objdata section(s) — embedded OLE objects
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL https://bit.ly/3gcM2I4 In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00525deb.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x525DEB	802004 bytes
SHA-256: `31d0e115bc7d61bd543bb83a04eeca4a895ee2c6c2d3c55fa4ad235cff576981`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): https://bit.ly/3gcM2I4
`objdata_01_off00526012.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x526012	63 bytes
SHA-256: `42d9af0323fb97aca6e24db96944bb9329e910997aef5ab319c3e8db0d113cfb`

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