RTF malware analysis — malicious · 5cd802be2edabb7d

MALICIOUS

RTF

2.74 MB Created: 2018-05-21 15:22:00 First seen: 2020-02-04

MD5: 42cba391fde9f82665dcc308d06bd4cd SHA-1: 22fcd05c4fea8355e93655291c20d59048ef86eb SHA-256: 5cd802be2edabb7df4c380dfb2aad93696647b0bd7cda1389678f651bb1f557b

502 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple indicators of malicious OLE object embedding, including the exploitation of CVE-2017-8759. Heuristics indicate the presence of large, hex-encoded data blocks within OLE objects, likely hiding a payload. ClamAV detections confirm the presence of Win.Trojan.Quasar, suggesting a remote access trojan. The extracted artifacts are the most critical IOCs.

Heuristics 12

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.
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.
ClamAV: Win.Trojan.Quasar-7172313-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Quasar-7172313-0
\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 ~2603KB of hex-encoded data inside \objdata sections — may hide a payload
Suspicious extracted artifact high 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.
OLE object data medium RTF_OBJDATA

RTF contains 2 \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.
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 http://schemas.microsoft.com In RTF body
- https://www.globalsign.com/repository/0In RTF body
- http://crl.globalsign.com/gs/gstimestampingg2.crl0TIn RTF body
- http://secure.globalsign.com/cacert/gstimestampingg2.crt0In RTF body
- https://www.globalsign.com/repository/03In RTF body
- http://crl.globalsign.net/root.crl0In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002a8a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2A8A	1301505 bytes
SHA-256: `68a6cd213668856a42437d59e71fab39f4e004aed9b77fce20de54e6b485290f`
Detection ClamAV: Win.Trojan.Quasar-7172313-0 Obfuscation or payload: likely Carved artifact entropy is 7.58, consistent with packed or encrypted content.
`objdata_01_off00299061.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x299061	23598 bytes
SHA-256: `9d6812245bb9a9acb8a063c32175f2d2d79fdda37feb88384d730b4323f75b05`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS Static shellcode analysis recovered command string(s): cmd.exe /c %tmp%\A.X %

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