RTF malware analysis — malicious · 2e60de20f1ef8056

MALICIOUS

RTF

1.69 MB Created: 2018-07-31 23:59:00 Authoring application: Riched20 6.3.9600 First seen: 2019-05-16

MD5: 9a0e2a0b1e61c43f9edb2ee53b6fb7dd SHA-1: e69f80e0b2dba284f4e317b1450a051334584bfa SHA-256: 2e60de20f1ef8056a136f155f248ec73f705cf9c2342f8cd7bd432b5b02421e2

322 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains multiple indicators of malicious activity, including embedded OLE objects and a critical firing for CVE-2017-8759. The presence of excessive hex data within OLE objects suggests the hiding of a payload. The document body contains garbled text but references a URL that is likely part of the attack chain. The exploitation of CVE-2017-8759 directly leads to client execution.

Heuristics 10

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
CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759

RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
\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.
Package object class high RTF_OBJCLASS_PACKAGE

OLE Package object — can wrap arbitrary files
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1669KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 3 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM

RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
Suspicious extracted artifact medium 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.
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://lis.ly.gov.tw In RTF body
- https://lis.ly.gov.tw}{In RTF body
- http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0001448a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1448A	829755 bytes
SHA-256: `533a72d92592a26e567b09092c4f01d8a61394cd1e800c6291ea15d16a5af5ca`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.94, consistent with packed or encrypted content.
`objdata_01_off001a9a1c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1A9A1C	4141 bytes
SHA-256: `43293cfbc5a7e250316e7ed8fa3914519dff68e32237655197644bb7b8d33557`
`objdata_02_off001abd7b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1ABD7B	7154 bytes
SHA-256: `b76f0fb379bb66926e2bf56673f236d810ca0b0674b094a8090ac4ede1605c3e`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: NOP sled

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