RTF malware analysis — malicious · 1eaceb257dac1dd6

MALICIOUS

RTF

1.34 MB First seen: 2019-03-18

MD5: 6b52cc1e02920b7ab4523c94aa448abb SHA-1: b13c78cdc4f0bc6dfb0e5386b1c35924d87b4352 SHA-256: 1eaceb257dac1dd6e7f3ed6b965845b256b024230e12d699999a090c7cb8fa33

402 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains multiple critical heuristic firings indicating the exploitation of CVE-2017-8570, which is known to drop a script file (SCT) for execution. The presence of OLE object data, composite monikers, and PE headers within hex data strongly suggests the file is a dropper. The embedded URL is benign and likely a red herring.

Heuristics 10

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 ~1220KB 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.
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/office/word/2003/wordml 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	609996 bytes
SHA-256: `e2161e126be51a126fd293a22a2119ae3f8111222e57ab07d3a3445383af6023`
`objdata_01_off0014242f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x14242F	31676 bytes
SHA-256: `8e1be3feb782a829ff258a0e054e4c260ab6864e307e975e6874709ef91bf7cf`
`objdata_02_off00151bdf.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x151BDF	381 bytes
SHA-256: `3458e1d85410d8b0a08c68591e0912e582782375d61f43343a9a5d6983b8c436`
`objdata_03_off00151f15.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x151F15	788 bytes
SHA-256: `9f474d871d5073e0821f436fc51680b1a4730c0843652540921f90acc5b5f4a5`
`objdata_04_off001525bb.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1525BB	2633 bytes
SHA-256: `1feb5f150bb35566d1a01fc59a357dc0ea34bc7498e0ec99bd939f6f848044b0`
`objdata_05_off00153ae3.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x153AE3	4679 bytes
SHA-256: `82391dd064c94b96ac16e2f26524d4d6c5630381aa5a88c7c3d5e8aac77bbfc4`

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