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Validation disclaimer: TTP overlap, actor similarity, generated summaries, and coverage findings are investigation leads, not attribution proof or operational validation without analyst review.

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T1129 · execution · 0 actors · 0 correlated reports

Shared Modules

Adversaries may execute malicious payloads via loading shared modules. Shared modules are executable files that are loaded into processes to provide access to reusable code, such as specific custom functions or invoking OS API functions (i.e., Native API). Adversaries may use this functionality as a way to execute arbitrary payloads on a victim system. For example, adversaries can modularize functionality of their malware into shared objects that perform various functions such as managing C2 network communications or execution of specific actions on objective. The Linux & macOS module loader can load and execute shared objects from arbitrary local paths. This functionality resides in `dlfcn.h` in functions such as `dlopen` and `dlsym`. Although macOS can execute `.so` files, common practice uses `.dylib` files. The Windows module loader can be instructed to load DLLs from arbitrary local paths and arbitrary Universal Naming Convention (UNC) network paths. This functionality resides in `NTDLL.dll` and is part of the Windows Native API which is called from functions like `LoadLibrary` at run time.

Open detection, hunting, mitigation, and evidence workspace

Detection logic

Monitoring DLL module loads may generate a significant amount of data and may not be directly useful for defense unless collected under specific circumstances, since benign use of Windows modules load functions are common and may be difficult to distinguish from malicious behavior. Legitimate software will likely only need to load routine, bundled DLL modules or Windows system DLLs such that deviation from known module loads may be suspicious. Limiting DLL module loads to `%SystemRoot%` and `%ProgramFiles%` directories will protect against module loads from unsafe paths. Correlation of other events with behavior surrounding module loads using API monitoring and suspicious DLLs written to disk will provide additional context to an event that may assist in determining if it is due to malicious behavior.

Observed actors

Correlated CTI and IR reports

Cyber Knowledge context

Use these routes to move from the ATT&CK behavior into explanation, implementation, evidence handling, validation, and defensive operations. Relevance is generated from explicit identifiers/names and governed topic mappings; it is not attribution evidence.

MITRE mitigations

M1038 · Execution Prevention

Prevent the execution of unauthorized or malicious code on systems by implementing application control, script blocking, and other execution prevention mechanisms. This ensures that only trusted and authorized code is executed, reducing the risk of malware and unauthorized actions. This mitigation can be implemented through the following measures: Application Control: - Use Case: Use tools like AppLocker or Windows Defender Application Control (WDAC) to create whitelists of authorized applications and block unauthorized ones. On Linux, use tools like SELinux or AppArmor to define mandatory access control policies for application execution. - Implementation: Allow only digitally signed or pre-approved applications to execute on servers and endpoints. (e.g., `New-AppLockerPolicy -PolicyType Enforced -FilePath "C:\Policies\AppLocker.xml"`) Script Blocking: - Use Case: Use script control me…

MITRE mitigation source

MITRE detection strategies and analytics

DET0018 · Behavior-chain, platform-aware detection strategy for T1129 Shared Modules
  • AN0052 · Analytic 0052 — A process (often LOLBin or user-launched program) loads a DLL from a user-writable/UNC/Temp path or unsigned/invalid signer. Within a short window the DLL is (a) newly written to disk, (b) spawned as follow-on execution (rundll32/regsvr32), or (c) establishes outbound C2.
  • AN0053 · Analytic 0053 — A process loads a shared object (.so) via dlopen/LD_PRELOAD/open from non-standard or temporary locations (e.g., /tmp, /dev/shm), especially shortly after that .so is written or fetched, or linked via manipulated environment variables (LD_PRELOAD/LD_LIBRARY_PATH).
  • AN0054 · Analytic 0054 — A process loads a non-system .dylib/.so via dyld (dlopen/dlsym) from user-writable locations (~/Library, /tmp) or after the library was recently created/downloaded, often followed by network egress or persistence.
MITRE detection source

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