RTF malware analysis — malicious · a46c21c8b5d7ec17

MALICIOUS

RTF

829.4 KB First seen: 2019-05-10

MD5: 5524336cae51b37798aa59cf801ab6b7 SHA-1: a634f4237e7a28d5f416921d216b5c5182b6939a SHA-256: a46c21c8b5d7ec17c43a641d18be11ac8d12b4a318482ef56ffd7b34fac8cc34

462 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of exploitation, including OLE object data, Equation Editor CLSID, and a PE header in hex data. The INCLUDETEXT/INCLUDEPICTURE heuristic indicates a remote URL is used to fetch content, specifically http://test1.ru/newbuild/t.php?thread=0&stats=send. ClamAV detections suggest this is a trojan agent and a dropper, likely downloading and executing a secondary payload.

Heuristics 11

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.
ClamAV: Win.Trojan.Agent-6592995-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-6592995-0
PE header (with DOS stub) in hex data critical RTF_MZ_HEX

Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
\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.
INCLUDETEXT/INCLUDEPICTURE remote URL high RTF_INCLUDE_REMOTE

RTF document uses INCLUDETEXT or INCLUDEPICTURE with an http:// URL — Word can fetch the remote content on open depending on Office version and external-content settings, enabling remote template injection, NTLM capture via redirects, or payload delivery
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 7 \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://test1.ru/newbuild/t.php?thread=0&stats=send In RTF body

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00009bfd.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9BFD	400 bytes
SHA-256: `fa79b00817f7495218632b8aca05100fc72b724a674512e970aa8642ceaa44bc`
`objdata_01_off00009f57.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9F57	393402 bytes
SHA-256: `8c9b1bd8e0fa4b366dbac61c4258386f1d065c562be6818a20d35dab1e720e88`
Detection ClamAV: Win.Dropper.Noon-6646767-0 Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_PUSH_STRING
`objdata_02_off000ca110.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xCA110	366 bytes
SHA-256: `0fa30d95bf62cc1ffa400698a49b8aa525ea1a8b5cfcee170853055d544db43e`
`objdata_03_off000ca428.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xCA428	1744 bytes
SHA-256: `546cd3b765cabce8adf69d362415e8b882e2781f3e5f33ac1919818855854ba8`
`objdata_04_off000cb206.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xCB206	782 bytes
SHA-256: `be9014234beb0c05f224b03871d694609d05449e2092f37efa7a7e2c0427f4cb`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript" & "" & rab & "" & "")
`objdata_05_off000cb8b3.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xCB8B3	2620 bytes
SHA-256: `e579362949fa658b405295e7ede6f41c080f831e0e397f49963b887e7c22f927`
`objdata_06_off000ccebc.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xCCEBC	4681 bytes
SHA-256: `75bdf0d3e6198ce8609d72f965634443d1596df6ed427f655b94bb1d92e195e5`

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