RTF malware analysis — malicious · 3f7978a8accf0041

MALICIOUS

RTF

213.1 KB First seen: 2019-11-20

MD5: beb86a6171a5311949c82f451b8eb934 SHA-1: 479d29d8f03dcc67e3f490ecc9b304c25fbab506 SHA-256: 3f7978a8accf0041a9f01de14134256c7c6e8b667183641f21349c947ce92346

262 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of exploitation, including composite monikers and OLE object data, specifically pointing to CVE-2017-8570. This vulnerability is known to drop SCT scripts, which are then likely executed to download a second-stage payload from the embedded URL.

Heuristics 9

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.
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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://danmaxexpress.com/ssl/u.exe In RTF body

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00005504.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x5504	3495 bytes
SHA-256: `677058985485c9732a66dd39af86ae700766354c540418682d3188ce21100032`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Sh"
`objdata_01_off00007157.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7157	12261 bytes
SHA-256: `c2e145786c38ff9a9613cb6195c0ab2d111b825bcc544af402b58d34f065621c`
`objdata_02_off0000d169.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xD169	2632 bytes
SHA-256: `6972d59c6a5aab7b99a6123cb936d8ddf6848307d3b0f6170d1ab71302ed9f9f`

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