TrickBot injectDLL Module: Man-in-the-Browser Web Injection Against Certificate Transparency
TrickBot injectDLL Module (TL-2026-2133), also tracked as Trickster, is a high-severity malware campaign, first published 2026-08-24. It is attributed to Periwinkle Tempest (Russia) with medium confidence, affects Microsoft Internet Explorer, maps to 10 MITRE ATT&CK techniques (T1027, T1036, T1055.001), and is covered by 9 detection rules and 22 indicators of compromise.
Key facts for TL-2026-2133
- Threat ID
- TL-2026-2133
- Also known as
- Trickster, TheTrick, TrickLoader
- Severity
- HIGH
- Status
- ACTIVE
- Category
- MALWARE
- First published
- 2026-08-24
- Last reviewed
- 2026-08-24
- Attribution
- Periwinkle Tempest
- Attribution confidence
- MEDIUM
- Nation-state nexus
- Russia
- Motivation
- FINANCIAL
- Target sectors
- banking, finance, cryptocurrency, ecommerce, technology, investment-services
- Target regions
- North America, united states of america, Global
- Detection rules
- 9
- Indicators of compromise
- 22
Malware and tooling in TrickBot injectDLL Module
Malware and tooling: Conti, Ryuk, Ryuk ransomware, TrickBot, Trick Bot, injectDLL
Kryptos Logic's technical analysis of TrickBot's injectDLL module documents a man-in-the-browser technique: the trojan opens a localhost SOCKS proxy on 127.0.0.1:15733, hooks browser networking and certificate-validation APIs to redirect and decrypt browser traffic, and rewrites Expect-CT/HPKP headers plus disables HTTP/2 and SPDY to defeat Certificate Transparency and pinning protections before delivering multistage JavaScript web injects.
How TrickBot injectDLL Module works
TrickBot's injectDLL module performs reflective DLL injection into Internet Explorer, Firefox, Chrome, and Microsoft Edge (excluding Tor Browser's firefox.exe process) to establish a man-in-the-browser (MITB) position. Once injected, the module hooks Connect, ConnectEx, and WSAIoctl to silently redirect all outbound browser traffic through a locally bound SOCKS4/SOCKS5 proxy on 127.0.0.1:15733, and hooks CertGetCertificateChain and CertVerifyCertificateChainPolicy to strip TLS validation errors so a self-signed, malware-generated certificate (CN=localhost, sha256WithRSAEncryption, 10-year validity) is silently trusted. To specifically defeat Certificate Transparency and HTTP Public Key Pinning, the module rewrites the Expect-CT header to X-pect-XX and Public-Key-Pins / Public-Key-Pins-Report-Only to X-blic-Key-Pins variants before they reach the browser's security stack. Because HTTP/2 and SPDY complicate stream-level interception, the module disables both: for Internet Explorer via the EnableHTTP2 and TabProcGrowth registry values, for Firefox via pref.js overrides (browser.tabs.remote.autostart, network.http.spdy.enabled.http2), and for Chrome by terminating and relaunching the browser with --disable-http2 --use-spdy=off --disable-quic. For Chrome specifically, the module also rewrites the NotBefore timestamp on its spoofed certificate (resetting years after 2017 and months after September) to predate Chrome's Certificate Transparency enforcement cutoff, defeating CT checks at the certificate-issuance-date level rather than only the header level. Firefox injection additionally overwrites the BaseThreadInitThunk address before injecting to evade Firefox's own remote-thread detection. Once the browser trusts the proxy's TLS termination, TrickBot delivers a first-stage JavaScript loader that beacons to s1.deadseaproductions.com/api.js (identifying itself via X-Client-Id/X-Client-Origin headers containing the bot ID), which in turn pulls a second, page-specific web-inject only when the victim browses a targeted site — corroborated by Check Point Research, which found the module actively targeting customers of roughly 60 high-profile US banking, cryptocurrency, e-commerce, and technology brands (including major banks, Blockchain.com, Amazon, and large brokerages). Second-stage scripts, disguised with filenames like jquery-3.5.1.min.js, are served from myca.adprimblox.fun and seq.mediaimg23.monster, are XOR-encrypted, and include anti-analysis logic that crashes the tab process if it detects deobfuscation tooling. Captured credentials and form submissions are exfiltrated over a separate DPOST channel (https://<c2>:<port>/<gtag>/<botid>/<command>/) to a large rotating pool of HTTPS C2 servers. TrickBot itself is a modular, Malware-as-a-Service banking trojan first observed in 2016 as a believed derivative of Dyre; it is primarily operated by the Russia-based Wizard Spider group (aka UNC1878, GOLD BLACKBURN, TEMP.MixMaster), which has historically used TrickBot-compromised networks as an initial-access foothold for deploying Ryuk and Conti ransomware.
MITRE ATT&CK techniques used in TL-2026-2133
Defense Evasion
T1027 Obfuscated Files or Information; T1036 Masquerading; T1055.001 Process Injection: Dynamic-link Library Injection; T1140 Deobfuscate/Decode Files or Information
Credential Access
T1056.004 Input Capture: Credential API Hooking
Command and Control
T1071.001 Application Layer Protocol: Web Protocols
defense-impairment
T1112 Modify Registry; T1553.004 Subvert Trust Controls: Install Root Certificate; T1685 Disable or Modify Tools
Collection
Affected products and versions in TrickBot injectDLL Module
- Microsoft — Internet Explorer
Vulnerable versions: all installed versions targeted by injectDLL reflective injection - Mozilla — Firefox
Vulnerable versions: desktop releases targeted by injectDLL reflective injection - Google — Chrome
Vulnerable versions: desktop releases targeted by injectDLL reflective injection - Microsoft — Edge
Vulnerable versions: Chromium-based desktop releases targeted by injectDLL reflective injection
Remediation for TrickBot injectDLL Module
Immediate actions
- Block outbound DNS/network access to known injectDLL C2 domains (s1.deadseaproductions.com, myca.adprimblox.fun, seq.mediaimg23.monster, akama.pocanomics.com) and the associated DPOST C2 IP set at the perimeter
- Alert on unexpected local listeners or SOCKS4/SOCKS5 handshakes on TCP/15733 and other loopback proxy ports on endpoint hosts
- Hunt for the EnableHTTP2 / TabProcGrowth registry modifications and Chrome relaunches with --disable-http2 --use-spdy=off --disable-quic as man-in-the-browser indicators
Workarounds
- Enforce browser launch-flag and configuration integrity via GPO/MDM so HTTP/2, SPDY, and QUIC cannot be silently disabled by a relaunching process
- Deploy application allowlisting/attack-surface-reduction rules to block unauthorized code injection into browser processes (iexplore.exe, firefox.exe, chrome.exe, msedge.exe)
Longer-term hardening
- Deploy EDR with remote-thread and reflective-DLL injection detection (CreateRemoteThread, NtMapViewOfSection, manual PE mapping) scoped to browser processes
- Enforce Certificate Transparency and pinning validation at a network-level TLS inspection/proxy layer that is independent of the endpoint browser's own header-based checks, so a compromised endpoint cannot silently strip Expect-CT/HPKP
- Maintain security-awareness training against macro-enabled phishing attachments and malicious links, TrickBot's primary initial-access vector
Timeline of TrickBot injectDLL Module
- TrickBot first identified in the wild as a banking trojan, believed to be a derivative of the earlier Dyre malware.
- TrickBot adds worm-propagation capability and an Outlook credential-harvesting module, beginning its shift into a modular MaaS platform.
- TrickBot is recognized as one of the top cybersecurity threats in the market as its module ecosystem and ransomware-delivery role expand.
- Kryptos Logic publishes a technical deep dive on the injectDLL module, detailing the localhost proxy, API hooking, and Certificate Transparency/HPKP header-tampering technique.
- Check Point Research publishes 'A Modern Ninja,' independently documenting injectDLL web-inject targeting of customers of roughly 60 high-profile US banking, cryptocurrency, e-commerce, and technology brands.
- Threadlinqs threat-intel pipeline ingests and documents the injectDLL man-in-the-browser technique for detection engineering coverage.
Sources cited for TrickBot injectDLL Module
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Detection coverage for TL-2026-2133
As of 2026-08-24, Threadlinqs Intelligence publishes 9 detection rule(s) for TL-2026-2133 across Splunk SPL, Microsoft KQL and Sigma, covering 22 indicator(s) of compromise. The whole corpus is readable without an account; a free account unlocks full detection query text in Splunk SPL, Microsoft KQL and Sigma; paid tiers add raw indicator values, correlation and the MCP server. Threadlinqs MCP server · View plans.