Win.Dropper.DarkKomet-9262651-0 RTF malware analysis — malicious · fdfd2eb54cb41e20

MALICIOUS

RTF

2.74 MB Created: 2018-05-21 15:22:00 First seen: 2018-11-05

MD5: 5ff5dce4a43770a5c29d1f7ab367143f SHA-1: 77081a9a5ce76455c7d35625afd4d7e5f012fce4 SHA-256: fdfd2eb54cb41e203f477b363e5dd09723b26c778f48cbd62715c2631f5eda33

502 Risk Score

Malware Insights

Win.Dropper.DarkKomet-9262651-0 · confidence 95%

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains multiple indicators of malicious activity, including OLE object data, embedded OLE objects, and excessive hex data within OLE objects. Critical heuristics identify the exploitation of CVE-2017-8759 and ClamAV detections point to the DarkKomet dropper family. The embedded OLE objects likely contain and execute a second-stage payload.

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.Dropper.Fareitvb-6699358-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Dropper.Fareitvb-6699358-0
\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

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: `3f3743806b831536003a55092b5ad6af0df507199f785984e2b48168cbc5a275`
Detection ClamAV: Win.Dropper.Fareitvb-6699358-0 Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: NOP sled Carved artifact entropy is 7.65, 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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