RTF malware analysis — malicious · 1ffe8a0c22c433b6

MALICIOUS

RTF

302.7 KB First seen: 2020-09-07

MD5: b5dc38b791076c31153ff6310b928113 SHA-1: 9baeef431b0d1705291292e6f9d311b5f77126ad SHA-256: 1ffe8a0c22c433b676f40639e236a1c7cc58656be5150f1bd4dc7f24d807c761

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of malicious activity, including OLE object data and composite moniker structures. Specifically, the CVE-2017-8570 heuristic firing indicates the exploitation of a vulnerability that drops an SCT script. This script is likely responsible for executing a second-stage payload, leading to the overall malicious behavior.

Heuristics 7

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.
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.
\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.
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 3 \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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000772.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x772	59401 bytes
SHA-256: `dd3e5112b7bd50d3afebf4592256a968fd3050c0484a88a11b98d699590cae7e`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): Wscript.Shell"" ) ")
`objdata_01_off0001d889.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1D889	12261 bytes
SHA-256: `12289ea42203fe86d5d6e86e52672f752ead5709842d0443203b40a4917d5ece`
`objdata_02_off0002389b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2389B	2632 bytes
SHA-256: `5de732ece55617b212baa0db7102c497ed7e809d372953a6a31ff14adb5754f5`

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