RTF malware analysis — malicious · 96013890816be089

MALICIOUS

RTF

1.74 MB First seen: 2019-04-18

MD5: 707f5a85e77054ab28413f2ecb7274ba SHA-1: 1a91488d3b8ff8b970e44d0671085dfba5c1546e SHA-256: 96013890816be089af9fe1dd5d4d723cce56c71dfac87e3f582ce23315ba8c7b

422 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of malicious activity, including embedded OLE objects with excessive hex data and a composite moniker related to CVE-2017-8570. This exploit is known to drop SCT scripts, which are then likely executed to download and run a secondary payload. The presence of a PE header within the hex data further suggests a packed or obfuscated executable payload.

Heuristics 11

Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570

RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
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: Rtf.Dropper.Agent-9965975-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Dropper.Agent-9965975-1
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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1653KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 7 \objdata section(s) — embedded OLE objects
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 http://schemas.openxmlformats.org/drawingml/2006/main In RTF body

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000031.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x31	826572 bytes
SHA-256: `56bc0f9a832eb5ca97328bcd8e47fae809c6ed4b9000b6ac3b8c234eab492561`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_STR_GETPROCADDRESS, SC_STR_VIRTUALPROTECT, heap spray 0x06 Static shellcode analysis recovered API/import strings: LoadLibraryA, GetProcAddress, VirtualAlloc, VirtualProtect, ExitProcess
`objdata_01_off001acb7f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1ACB7F	22732 bytes
SHA-256: `2d2bd25c225a6fdcaa057c6b05b9d58ae86ef629e3c76ac347f822e6e2d44d72`
`objdata_02_off001b7d4f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1B7D4F	382 bytes
SHA-256: `9d6fa4be1a4a694cfee89268078c9efc8705b1a473fbb09a37ceb2d45104e44b`
`objdata_03_off001b8087.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1B8087	789 bytes
SHA-256: `8ab026a3e66d94feae5647d5ac6558412271b58006835755f301bcce43b1e52a`
`objdata_04_off001b872f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1B872F	2633 bytes
SHA-256: `1feb5f150bb35566d1a01fc59a357dc0ea34bc7498e0ec99bd939f6f848044b0`
`objdata_05_off001b9c57.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1B9C57	4679 bytes
SHA-256: `6bb172535cccd16de71bca846e2bb6df177c56b3a545d6e6314435eabf5d2217`

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