Place lemongrass, oil, fish sauce, sugar, lime juice, soy sauce, turmeric, garlic, coriander, and Sriracha in jar of a blender and blend on high speed until smooth, about 30 seconds, scraping down sides as necessary.
Place chicken in a large resealable plastic bag and pour in marinade. Place in refrigerator and marinate 1 to 2 hours, turning bag occasionally to marinate evenly.
Remove chicken from marinade and thread onto wooden skewers.
Grill chicken until browned on both sides and cooked through, about 3 minutes per side. Transfer to a platter, let rest for 5 minutes, then serve immediately with Spicy Peanut Sauce