RTF malware analysis — malicious · b2887ae25d1e9706

MALICIOUS

RTF

1.69 MB Created: 2018-07-31 23:59:00 Authoring application: Riched20 6.3.9600 First seen: 2020-02-04

MD5: 92a109141a697d5e738171fede7503ba SHA-1: 9fb5d91c3d14e657ffc57be559059e067a852da5 SHA-256: b2887ae25d1e9706da9e1303b7da62986934ecac8bd6c6bd274563426ddc9d11

322 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple OLE objects, including an Equation Editor object, and uses \objupdate to force activation. Critical heuristics indicate exploitation of CVE-2017-8759, a known vulnerability in MSXML that allows for remote code execution. The large amount of hex-encoded data within the OLE objects suggests a hidden payload, likely delivered via the embedded OLE object. The presence of URLs related to Taiwan's legislative branch suggests a potential lure.

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: `405f378176f4a327891acf692a9331d63c9792c6119547d0acd0701e01d4b796`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, 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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